從 PHP 投影片形狀中提取影像

概觀

投影片中的影像可以出現在多種形狀類型中：普通的圖片框、套用於形狀的圖片填充、OLE 物件預覽影像、影片或音訊框的縮圖、縮放影像，或是嵌入於表格、圖表和 SmartArt 形狀中的影像。Aspose.Slides 將這些影像儲存在投影片影像集合中，可透過 ImageCollection 與 PPImage 物件存取。

如果您只需要匯出投影片中嵌入的每個影像資源，只要遍歷 presentation->getImages() 即可。本篇說明的是另一項任務：遍歷形狀以找出投影片上使用影像的位置，讓儲存的檔案保留有用的上下文資訊，例如投影片編號、形狀位置與來源類型（圖片框、填充影像、媒體預覽、OLE 預覽或縮放影像）。

Tip

使用 PPImage 及其 getBinaryData() 方法，以保留原始編碼的影像資料與檔案類型。若要將輸出正規化為特定格式（例如 PNG），請使用 getImage()。

共享輔助方法

以下的輔助方法讓範例保持簡潔。saveOriginalImage 會寫入原始嵌入的位元組，根據 MIME 類型選擇安全的副檔名，並透過 SHA-256 雜湊跳過重複的影像二進位資料。

use aspose\slides\FillType;
use aspose\slides\ImageFormat;

class ShapeReference
{
    public $shape;
    public $namePart;

    public function __construct($shape, $namePart)
    {
        $this->shape = $shape;
        $this->namePart = $namePart;
    }
}

function isNullJava($value)
{
    return $value == null || java_is_null($value);
}

function saveOriginalImage($image, $outputDirectory, $fileNameBase, &$savedImageHashes)
{
    if (isNullJava($image)) {
        return false;
    }

    $imageData = $image->getBinaryData();
    $imageBytes = getBinaryString($imageData);
    $imageHash = hash("sha256", $imageBytes);
    if (isset($savedImageHashes[$imageHash])) {
        return false;
    }

    $savedImageHashes[$imageHash] = true;

    $extension = getExtensionFromContentType($image->getContentType());
    $fileName = $fileNameBase . "." . $extension;
    $outputPath = $outputDirectory . DIRECTORY_SEPARATOR . $fileName;
    file_put_contents($outputPath, $imageBytes);
    return true;
}

function saveImageAsPng($image, $outputDirectory, $fileNameBase)
{
    if (isNullJava($image)) {
        return false;
    }

    $fileName = $fileNameBase . ".png";
    $outputPath = $outputDirectory . DIRECTORY_SEPARATOR . $fileName;

    $outputImage = $image->getImage();
    try {
        $outputImage->save($outputPath, ImageFormat::Png);
    } finally {
        if (!isNullJava($outputImage)) {
            $outputImage->dispose();
        }
    }

    return true;
}

function getPictureFillImage($fillFormat)
{
    if (isNullJava($fillFormat) || java_values($fillFormat->getFillType()) != FillType::Picture) {
        return null;
    }

    return $fillFormat->getPictureFillFormat()->getPicture()->getImage();
}

function enumerateShapes($shapes, $prefix, $includeGroupedShapes)
{
    $shapeReferences = [];
    $shapeCount = java_values($shapes->size());
    for ($shapeIndex = 0; $shapeIndex < $shapeCount; $shapeIndex++) {
        $shape = $shapes->get_Item($shapeIndex);
        $displayIndex = $shapeIndex + 1;
        $shapeNamePart = $prefix . "_shape_" . $displayIndex;
        $shapeReferences[] = new ShapeReference($shape, $shapeNamePart);

        if ($includeGroupedShapes && java_instanceof($shape, new JavaClass("com.aspose.slides.GroupShape"))) {
            $childShapes = $shape->getShapes();
            $childReferences = enumerateShapes(
                $childShapes,
                $shapeNamePart,
                $includeGroupedShapes
            );
            $shapeReferences = array_merge($shapeReferences, $childReferences);
        }
    }

    return $shapeReferences;
}

function getBinaryString($binaryData)
{
    $bytes = java_values($binaryData);
    if (is_string($bytes)) {
        return $bytes;
    }

    $binaryString = "";
    foreach ($bytes as $byte) {
        $binaryString .= chr($byte & 0xff);
    }

    return $binaryString;
}

function getExtensionFromContentType($contentType)
{
    if ($contentType == null || strlen(trim($contentType)) == 0) {
        return "bin";
    }

    $mediaTypeParts = explode(";", $contentType);
    $mediaType = strtolower(trim($mediaTypeParts[0]));
    if ($mediaType == "image/jpeg") {
        return "jpg";
    }

    if ($mediaType == "image/png") {
        return "png";
    }

    if ($mediaType == "image/gif") {
        return "gif";
    }

    if ($mediaType == "image/bmp") {
        return "bmp";
    }

    if ($mediaType == "image/tiff") {
        return "tiff";
    }

    if ($mediaType == "image/x-emf" || $mediaType == "image/emf") {
        return "emf";
    }

    if ($mediaType == "image/x-wmf" || $mediaType == "image/wmf") {
        return "wmf";
    }

    if ($mediaType == "image/svg+xml") {
        return "svg";
    }

    if (strpos($mediaType, "image/") === 0) {
        $extension = substr($mediaType, strlen("image/"));
        return makeSafeFileNamePart($extension);
    }

    return "bin";
}

function makeSafeFileNamePart($value)
{
    return preg_replace("/[^A-Za-z0-9._-]/", "_", $value);
}

從圖片框提取影像

此方法適用於以獨立物件插入的圖片。PictureFrame 會將其圖片儲存在 getPictureFormat()->getPicture()->getImage()，該方法回傳一個 PPImage 物件。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "extracted-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.PictureFrame"))) {
                $pictureFrame = $shapeReference->shape;
                $image = $pictureFrame->getPictureFormat()->getPicture()->getImage();
                saveOriginalImage($image, $outputDirectory, $shapeReference->namePart, $savedImageHashes);
            }
        }
    }
} finally {
    $presentation->dispose();
}

從圖像填充的形狀提取影像

形狀可以使用圖片作為填充。首先檢查形狀的填充類型：若不是 FillType.Picture，則該填充中沒有圖片可供提取。以下範例處理 AutoShape 物件，並透過 PPImage 及其 getImage() 方法將每張影像儲存為 PNG。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "shape-fill-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.AutoShape"))) {
                $autoShape = $shapeReference->shape;
                $fillFormat = $autoShape->getFillFormat();
                $image = getPictureFillImage($fillFormat);
                if (!isNullJava($image)) {
                    saveImageAsPng($image, $outputDirectory, $shapeReference->namePart);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從 OLE 物件框提取預覽影像

OleObjectFrame 可以有 PowerPoint 用於投影片上物件預覽的替代圖片。此影像可透過 getSubstitutePictureFormat()->getPicture()->getImage() 取得。提取此圖片會得到預覽影像，而非嵌入的 OLE 套件內容。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "ole-preview-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.OleObjectFrame"))) {
                $oleObjectFrame = $shapeReference->shape;
                $image = $oleObjectFrame->getSubstitutePictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_ole_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從影片框提取預覽影像

VideoFrame 也可以在 getPictureFormat()->getPicture()->getImage() 中儲存預覽影像。這是投影片上顯示的海報或縮圖，並非從影片串流解碼的影格。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "video-preview-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.VideoFrame"))) {
                $videoFrame = $shapeReference->shape;
                $image = $videoFrame->getPictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_video_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從音訊框提取預覽影像

AudioFrame 可以在 getPictureFormat()->getPicture()->getImage() 中儲存縮圖。這是投影片上音訊物件所顯示的影像。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "audio-preview-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.AudioFrame"))) {
                $audioFrame = $shapeReference->shape;
                $image = $audioFrame->getPictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_audio_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從縮放物件提取影像

ZoomFrame 與 SectionZoomFrame 形狀可以使用自訂影像。從縮放框讀取 getZoomImage()。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "zoom-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.ZoomFrame"))) {
                $zoomFrame = $shapeReference->shape;
                $image = $zoomFrame->getZoomImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_zoom";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                    continue;
                }
            }

            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.SectionZoomFrame"))) {
                $sectionZoomFrame = $shapeReference->shape;
                $image = $sectionZoomFrame->getZoomImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_section_zoom";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                    continue;
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從摘要縮放框提取影像

SummaryZoomFrame 也是一種形狀。其各節項目可以使用自訂影像，透過每個摘要縮放節的 getZoomImage() 方法取得。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "summary-zoom-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, false);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.SummaryZoomFrame"))) {
                $summaryZoomFrame = $shapeReference->shape;
                $summaryZoomCollection = $summaryZoomFrame->getSummaryZoomCollection();
                $sectionCount = java_values($summaryZoomCollection->size());
                for ($sectionIndex = 0; $sectionIndex < $sectionCount; $sectionIndex++) {
                    $summaryZoomSection = $summaryZoomCollection->get_Item($sectionIndex);
                    $image = $summaryZoomSection->getZoomImage();
                    if (!isNullJava($image)) {
                        $displayIndex = $sectionIndex + 1;
                        $fileNameBase = $shapeReference->namePart . "_summary_zoom_" . $displayIndex;
                        saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                    }
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從表格形狀提取影像

Table 為形狀。表格中的影像通常以圖片填充的方式儲存在儲存格內。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "table-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, true);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.Table"))) {
                $table = $shapeReference->shape;
                $rowCount = java_values($table->getRows()->size());
                $columnCount = java_values($table->getColumns()->size());
                for ($rowIndex = 0; $rowIndex < $rowCount; $rowIndex++) {
                    for ($columnIndex = 0; $columnIndex < $columnCount; $columnIndex++) {
                        $cell = $table->get_Item($columnIndex, $rowIndex);
                        $fillFormat = $cell->getCellFormat()->getFillFormat();
                        $image = getPictureFillImage($fillFormat);
                        if (!isNullJava($image)) {
                            $displayRow = $rowIndex + 1;
                            $displayColumn = $columnIndex + 1;
                            $fileNameBase = $shapeReference->namePart . "_cell_" . $displayRow . "_" . $displayColumn;
                            saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                        }
                    }
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從圖表形狀提取影像

Chart 為形狀。以下範例從圖表區域的圖片填充中提取影像。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "chart-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, true);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.Chart"))) {
                $chart = $shapeReference->shape;
                $fillFormat = $chart->getFillFormat();
                $image = getPictureFillImage($fillFormat);
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_chart_area";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

從 SmartArt 形狀提取影像

SmartArt 物件是形狀。依據 SmartArt 版面配置，影像可能儲存在節點項目的項目符號填充中，或儲存在節點形狀的填充格式中。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "smartart-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, true);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.SmartArt"))) {
                $smartArt = $shapeReference->shape;
                $allNodes = $smartArt->getAllNodes();
                $nodeCount = java_values($allNodes->size());
                for ($nodeIndex = 0; $nodeIndex < $nodeCount; $nodeIndex++) {
                    $node = $allNodes->get_Item($nodeIndex);
                    $bulletFillFormat = $node->getBulletFillFormat();
                    $bulletImage = getPictureFillImage($bulletFillFormat);
                    if (!isNullJava($bulletImage)) {
                        $displayNode = $nodeIndex + 1;
                        $fileNameBase = $shapeReference->namePart . "_smartart_node_" . $displayNode . "_bullet";
                        saveOriginalImage($bulletImage, $outputDirectory, $fileNameBase, $savedImageHashes);
                    }

                    $nodeShapes = $node->getShapes();
                    $nodeShapeCount = java_values($nodeShapes->size());
                    for ($nodeShapeIndex = 0; $nodeShapeIndex < $nodeShapeCount; $nodeShapeIndex++) {
                        $nodeShape = $nodeShapes->get_Item($nodeShapeIndex);
                        $fillFormat = $nodeShape->getFillFormat();
                        $image = getPictureFillImage($fillFormat);
                        if (!isNullJava($image)) {
                            $displayNode = $nodeIndex + 1;
                            $displayNodeShape = $nodeShapeIndex + 1;
                            $fileNameBase = $shapeReference->namePart . "_smartart_node_" . $displayNode . "_shape_" . $displayNodeShape;
                            saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                        }
                    }
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

包含群組形狀內的影像

群組形狀包含自己的形狀集合。共享的 enumerateShapes 輔助方法有一個 includeGroupedShapes 選項。若要檢查位於 GroupShape 物件內的形狀，請將其設為 true。以下範例從圖片框、圖片填充形狀、OLE 物件預覽、影片框縮圖以及音訊框縮圖中提取影像。若要同時包含表格、圖表、SmartArt 與摘要縮放的影像，請重新使用前述章節的專屬提取邏輯，同時保留相同的遞迴形狀遍歷方式。

use aspose\slides\Presentation;

$inputPath = "sample.pptx";
$outputDirectory = getcwd() . DIRECTORY_SEPARATOR . "all-shape-images";
if (!is_dir($outputDirectory)) {
    mkdir($outputDirectory, 0777, true);
}

$savedImageHashes = [];

$presentation = new Presentation($inputPath);
try {
    $slideCount = java_values($presentation->getSlides()->size());
    for ($slideIndex = 0; $slideIndex < $slideCount; $slideIndex++) {
        $slide = $presentation->getSlides()->get_Item($slideIndex);
        $slideNumber = java_values($slide->getSlideNumber());
        $slidePrefix = "slide_" . $slideNumber;
        $shapes = $slide->getShapes();
        $shapeReferences = enumerateShapes($shapes, $slidePrefix, true);
        foreach ($shapeReferences as $shapeReference) {
            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.OleObjectFrame"))) {
                $oleObjectFrame = $shapeReference->shape;
                $image = $oleObjectFrame->getSubstitutePictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_ole_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }

                continue;
            }

            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.VideoFrame"))) {
                $videoFrame = $shapeReference->shape;
                $image = $videoFrame->getPictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_video_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }

                continue;
            }

            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.AudioFrame"))) {
                $audioFrame = $shapeReference->shape;
                $image = $audioFrame->getPictureFormat()->getPicture()->getImage();
                if (!isNullJava($image)) {
                    $fileNameBase = $shapeReference->namePart . "_audio_preview";
                    saveOriginalImage($image, $outputDirectory, $fileNameBase, $savedImageHashes);
                }

                continue;
            }

            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.PictureFrame"))) {
                $pictureFrame = $shapeReference->shape;
                $image = $pictureFrame->getPictureFormat()->getPicture()->getImage();
                saveOriginalImage($image, $outputDirectory, $shapeReference->namePart, $savedImageHashes);
                continue;
            }

            if (java_instanceof($shapeReference->shape, new JavaClass("com.aspose.slides.AutoShape"))) {
                $autoShape = $shapeReference->shape;
                $fillFormat = $autoShape->getFillFormat();
                $image = getPictureFillImage($fillFormat);
                if (!isNullJava($image)) {
                    saveOriginalImage($image, $outputDirectory, $shapeReference->namePart, $savedImageHashes);
                }
            }
        }
    }
} finally {
    $presentation->dispose();
}

邊緣情況與實務說明

重複影像：多個形狀可能參照同一張影像，或是不同的影像卻有相同的位元組。若希望每個唯一影像只產生一個輸出檔，請在寫入檔案前使用 getBinaryData() 取得的 PPImage 資料計算 SHA-256 雜湊。
原始資料與轉換輸出：儲存 PPImage 從 getBinaryData() 取得的資料，可保留嵌入的 JPEG、PNG、GIF、SVG、EMF 或 WMF 資料。使用 getImage() 的結果適用於需要統一輸出格式的情況。
不支援的填充類型：實心、漸層、圖案及無填充的形狀不含圖片填充。讀取 getPictureFillFormat() 前請先檢查 FillType。
群組形狀：頂層投影片形狀集合不會自動展開群組。若群組內容很重要，請透過 getShapes() 递归檢查 GroupShape 內部。
OLE 物件預覽：OleObjectFrame 可能透過 getSubstitutePictureFormat() 提供預覽影像，但該影像僅為投影片預覽，並非 OLE 物件內嵌的檔案。
影片框縮圖：VideoFrame 可能透過 getPictureFormat() 提供預覽影像，該影像僅為投影片上顯示的海報，並非從影片串流中解碼的影格。
音訊框縮圖：AudioFrame 可能透過 getPictureFormat() 提供圖示或縮圖；它不代表嵌入的音訊資料。
縮放影像：投影片縮放、章節縮放與摘要縮放形狀可能使用自訂的 PPImage 物件，透過 getZoomImage() 取得。
巢狀形狀模型：表格、圖表與 SmartArt 物件皆實作 Shape，但其影像常儲存在巢狀的表格儲存格、圖表元素或 SmartArt 節點的格式物件中。
裁剪或變形的圖片：取得 PPImage 只會得到儲存的影像資源，並不會套用形狀所做的裁剪、透明度、重新著色、旋轉或其他視覺效果。

常見問題

我可以在不裁剪、套用效果或形狀變換的情況下提取原始影像嗎？

是。存取 PPImage 物件，並將 getBinaryData() 的資料寫入磁碟，即可保留投影片中儲存的原始編碼影像，而非投影片上呈現的效果。

我可以將所有提取的影像匯出為 PNG 嗎？

是。使用 PPImage 及其 getImage() 方法，然後呼叫 save() 並指定 ImageFormat 為 PNG。此方式會將輸出轉換為 PNG，可能不會保留原始檔案類型或向量資料。

我要如何避免多次儲存相同的影像？

使用 getBinaryData() 取得的 PPImage 資料計算雜湊，將雜湊值存入集合。若新影像的雜湊已存在，則跳過或改為記錄對已存在輸出檔的另一個參考。

為什麼某些形狀不會產生影像？

圖片框、圖片填充形狀、OLE 物件框、媒體框、縮放框、表格、圖表與 SmartArt 物件都可能參照影像。但某些形狀的影像是透過巢狀的格式物件暴露，僅檢查 getPictureFormat() 或形狀的 getFillFormat() 並不足以捕捉所有情況。

我可以提取影片框顯示的縮圖嗎？

是。使用 VideoFrame 並讀取 getPictureFormat()->getPicture()->getImage()，即可提取隨影片框儲存的海報影像，而非從影片檔案中產生的影格。

我該如何判斷哪些形狀使用投影片影像集合中的特定影像？

Aspose.Slides 不會從 PPImage 反向追蹤至形狀。於遍歷過程中建立映射：每當發現影像參考時，記錄投影片編號、形狀路徑以及影像雜湊或集合項目。

我可以提取嵌入於 OLE 物件內的影像，例如附加的文件嗎？

您可以從 OleObjectFrame 提取該物件的投影片預覽影像。但此預覽影像並非嵌入的文件本身。若要從嵌入的檔案中提取影像，需要先提取 OLE 資料，然後使用相應檔案類型的工具進行檢查。

取得簡報中整個投影片背景為影像在 Aspose.Slides for PHP via Java 中的多執行緒