需求
需要把其他執行檔案的ICON讀取出來,然後在程式中顯示。
實現
class ExtractIcon
{
public static Bitmap GetBitmapFromExeIcon(string path)
{
return GetBitmap(GetIconFromExe(path));
}
public static Icon GetIconFromExe(string path)
{
return GetIconFromExe(path, true);
}
//http://www.pinvoke.net/default.aspx/shell32/ExtractIconEx.html
public static Icon GetIconFromExe(string path, bool large)
{
IntPtr hLargeIcon = IntPtr.Zero;
IntPtr hSmallIcon = IntPtr.Zero;
ExtractIconEx(path, 0, ref hLargeIcon, ref hSmallIcon, 1);
if (large)
{
return (Icon)Icon.FromHandle(hLargeIcon).Clone();
}
else
{
return (Icon)Icon.FromHandle(hSmallIcon).Clone();
}
}
//http://social.msdn.microsoft.com/Forums/en-US/netfxcompact/thread/e765775c-a5b5-493f-baeb-3eaee1d41cef
public static Bitmap GetBitmap(Icon icon)
{
Bitmap bmp = new Bitmap(icon.Width, icon.Height);
//Create temporary graphics
Graphics gxMem = Graphics.FromImage(bmp);
//Draw the icon
gxMem.DrawIcon(icon, 0, 0);
//Clean up
gxMem.Dispose();
return bmp;
}
//http://msdn.microsoft.com/en-us/library/aa922154.aspx
[DllImport("coredll.dll", SetLastError = true)]
private static extern IntPtr ExtractIconEx(string fileName, int index, ref IntPtr hIconLarge, ref IntPtr hIconSmall, uint nIcons);
}
MS提供了ExtractIconEx函數可以取出執行檔案的大小Ico表徵圖資訊。第三個參數為大表徵圖,第四個參數為小表徵圖。
由於Icon對象不能直接在Graphics上畫,所以需要轉換成Bitmap,但是Compact Framework又不支援Icon.Save(),所以實現了一個Bitmap GetBitmap(Icon icon) 函數。
如下,取出word的表徵圖。
第二個圖去掉ico背景