public DialogResult ShowDialog()
{
//set up the struct and populate it
OpenFileName ofn = new OpenFileName();
ofn.lStructSize = Marshal.SizeOf(ofn);
ofn.lpstrFilter = m_Filter.Replace('|', '\0') + '\0';
ofn.lpstrFile = m_FileName + new string(' ', 512);
ofn.nMaxFile = ofn.lpstrFile.Length;
ofn.lpstrFileTitle = System.IO.Path.GetFileName(m_FileName) + new string(' ', 512);
ofn.nMaxFileTitle = ofn.lpstrFileTitle.Length;
ofn.lpstrTitle = "Save file as";
ofn.lpstrDefExt = m_DefaultExt;
//position the dialog above the active window
ofn.hwndOwner = Form.ActiveForm.Handle;
//we need to find out the active screen so the dialog box is
//centred on the correct display
m_ActiveScreen = Screen.FromControl(Form.ActiveForm);
//set up some sensible flags
ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_NOTESTFILECREATE | OFN_ENABLEHOOK | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
//this is where the hook is set. Note that we can use a C# delegate in place of a C function pointer
ofn.lpfnHook = new OFNHookProcDelegate(HookProc);
//if we're running on Windows 98/ME then the struct is smaller
if (System.Environment.OSVersion.Platform != PlatformID.Win32NT)
{
ofn.lStructSize -= 12;
}
//show the dialog
if (!GetSaveFileName(ref ofn))
{
int ret = CommDlgExtendedError();
if (ret != 0)
{
throw new ApplicationException("Couldn't show file open dialog - " + ret.ToString());
}
return(DialogResult.Cancel);
}
m_FileName = ofn.lpstrFile;
return(DialogResult.OK);
}
private static extern bool GetSaveFileName(ref OpenFileName lpofn);