protected override IntPtr HookProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam)
{
IntPtr result = IntPtr.Zero;
if (msg == 78)
{
this._hwndFileDialog = UnsafeNativeMethods.GetParent(new HandleRef(this, hwnd));
NativeMethods.OFNOTIFY ofnotify = (NativeMethods.OFNOTIFY)UnsafeNativeMethods.PtrToStructure(lParam, typeof(NativeMethods.OFNOTIFY));
switch (ofnotify.hdr_code)
{
case -606:
if (this._ignoreSecondFileOkNotification)
{
if (this._fileOkNotificationCount != 0)
{
this._ignoreSecondFileOkNotification = false;
UnsafeNativeMethods.CriticalSetWindowLong(new HandleRef(this, hwnd), 0, NativeMethods.InvalidIntPtr);
result = NativeMethods.InvalidIntPtr;
break;
}
this._fileOkNotificationCount = 1;
}
if (!this.DoFileOk(ofnotify.lpOFN))
{
UnsafeNativeMethods.CriticalSetWindowLong(new HandleRef(this, hwnd), 0, NativeMethods.InvalidIntPtr);
result = NativeMethods.InvalidIntPtr;
}
break;
case -604:
this._ignoreSecondFileOkNotification = true;
this._fileOkNotificationCount = 0;
break;
case -602:
{
NativeMethods.OPENFILENAME_I openfilename_I = (NativeMethods.OPENFILENAME_I)UnsafeNativeMethods.PtrToStructure(ofnotify.lpOFN, typeof(NativeMethods.OPENFILENAME_I));
int num = (int)UnsafeNativeMethods.UnsafeSendMessage(this._hwndFileDialog, (WindowMessage)1124, IntPtr.Zero, IntPtr.Zero);
if (num > openfilename_I.nMaxFile)
{
int num2 = num + 2048;
NativeMethods.CharBuffer charBuffer = NativeMethods.CharBuffer.CreateBuffer(num2);
IntPtr lpstrFile = charBuffer.AllocCoTaskMem();
Marshal.FreeCoTaskMem(openfilename_I.lpstrFile);
openfilename_I.lpstrFile = lpstrFile;
openfilename_I.nMaxFile = num2;
this._charBuffer = charBuffer;
Marshal.StructureToPtr(openfilename_I, ofnotify.lpOFN, true);
Marshal.StructureToPtr(ofnotify, lParam, true);
}
break;
}
case -601:
base.MoveToScreenCenter(new HandleRef(this, this._hwndFileDialog));
break;
}
}
else
{
result = base.HookProc(hwnd, msg, wParam, lParam);
}
return(result);
}