[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：
{
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。
{
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();
}