[C#]Export PowerPoint file to photos

要將PowerPoint檔案中的每張投影片匯出成圖檔，我們可以將PowerPoint的Com元件加入參考。

撰寫如下的程式： void ConvertPptToJpg(string file, string outputPath) { var application = new Microsoft.Office.Interop.PowerPoint.Application();

		var ppt = application.Presentations.Open(file, MsoTriState.msoFalse, MsoTriState.msoFalse, MsoTriState.msoFalse);

		var index = 0;
		var fileName = Path.GetFileNameWithoutExtension(file);
		foreach (Slide slid in ppt.Slides)
		{
			++index;
			slid.Export(Path.Combine(outputPath, string.Format("{0}{1}.jpg", fileName, index)), "jpg", Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
		}

		ppt.Close();
		application.Quit();
		GC.Collect();
	}

程式碼很簡單，就是建立出PowerPoint應用程式後，讓PowerPoint應用程式將投影片檔案開啟，開啟時設定不顯示視窗，然後遍巡所有的投影片匯出，匯出時帶入匯出的檔案位置以及想要的解析度大小，做完後再將PowerPoint檔及應用程式關閉。

實際將投影片位置以及匯出檔案存放的位置帶入

… ConvertPptToJpg(@“C:\Users\larry\Desktop\Win8 Screen Capture.pptx”, @“c:"); …

可以看到投影片如我們預期的轉成一張張的圖檔。

這邊也可以進一步用Late-Binding的方式處理，效果一樣。

	private void NAR(object o)
	{
		try
		{
			while ((Marshal.ReleaseComObject(o) > 0) || (Marshal.FinalReleaseComObject(o) > 0))
			{
			}
		}
		catch
		{
		}
		finally
		{
			o = null;
		}
	}

	void ConvertPptToJpg(string file, string outputPath)
	{
		Type t = Type.GetTypeFromProgID("PowerPoint.Application");
		object o = Activator.CreateInstance(t);

		object p = t.InvokeMember(
			"Presentations",
			BindingFlags.Public | BindingFlags.GetProperty,
			null, o, null, null);

		Type t2 = p.GetType();
		object ppt = t2.InvokeMember("Open",
			BindingFlags.Public | BindingFlags.InvokeMethod,
			null, p, new object[] { file, 0, 0, 0 }, null);

		object slides = t2.InvokeMember(
		"Slides",
		BindingFlags.Public | BindingFlags.GetProperty,
		null, ppt, null, null);

		var index = 0;
		var fileName = Path.GetFileNameWithoutExtension(file);
		foreach (object slid in (slides as IEnumerable))
		{
			++index;
			var slidType = slid.GetType();
			slidType.InvokeMember("Export",
			BindingFlags.Public | BindingFlags.InvokeMethod,
			null, slid, new object[] { Path.Combine(outputPath, string.Format("{0}{1}.jpg", fileName, index)), "jpg", Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height }, null);
			NAR(slid);
		}

		NAR(p);
		p = null;

		NAR(slides);
		slides = null;

		t2.InvokeMember("Close",
			BindingFlags.Public | BindingFlags.InvokeMethod,
			null, ppt, null, null);

		NAR(ppt);
		ppt = null;

		t.InvokeMember(
			"Quit",
			BindingFlags.Public | BindingFlags.InvokeMethod,
			null, o, null, null);

		NAR(o);
		o = null;

		GC.Collect();
	}

Link

How to convert PowerPoint (.ppt, .pptx) to several images of each slide?

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