public int AddSystemIcon(string filename)
{
string tempFile = GetTempFileOfType(filename);
try
{
SHFILEINFO shFileInfoSmallIcon = new SHFILEINFO();
SHFILEINFO shFileInfoLargeIcon = new SHFILEINFO();
IntPtr hSmallIcon = WindowsAPI.SHGetFileInfo(tempFile, 256, ref shFileInfoSmallIcon, (uint) Marshal.SizeOf(shFileInfoSmallIcon), WindowsAPI.SHGFI_ICON | WindowsAPI.SHGFI_SMALLICON | WindowsAPI.SGHFI_USEFILEATTRIBUTES);
IntPtr hLargeIcon = WindowsAPI.SHGetFileInfo(tempFile, 256, ref shFileInfoLargeIcon, (uint) Marshal.SizeOf(shFileInfoLargeIcon), WindowsAPI.SHGFI_ICON | WindowsAPI.SHGFI_LARGEICON | WindowsAPI.SGHFI_USEFILEATTRIBUTES);
System.Drawing.Icon smallIcon = System.Drawing.Icon.FromHandle(shFileInfoSmallIcon.hIcon);
System.Drawing.Icon largeIcon = System.Drawing.Icon.FromHandle(shFileInfoLargeIcon.hIcon);
int retIndex = m_smallIcons.Images.Count;
m_smallIcons.Images.Add(smallIcon);
WindowsAPI.DestroyIcon(smallIcon.Handle);
m_largeIcons.Images.Add(largeIcon);
WindowsAPI.DestroyIcon(largeIcon.Handle);
return retIndex;
}
finally
{
File.Delete(tempFile);
}
}
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);