How to change position of an OPENFILENAME dialog in Windows?

问题

This is my attempt using a hook function to get the dialog window handle. Both SetWindowPos() and GetLastError() return correct values, but the dialog window is unaffected and shown at position 0,0.

#include <windows.h>
#include <iostream>

static UINT_PTR CALLBACK OFNHookProc (HWND hdlg, UINT uiMsg, WPARAM wParam, LPARAM lParam) {
  using namespace std;
  switch (uiMsg) {
    case WM_INITDIALOG: {
      // SetWindowPos returns 1
      cout << SetWindowPos(hdlg, HWND_TOPMOST, 200, 200, 0, 0, SWP_NOSIZE ) << endl;
      // GetLastError returns 0
      cout << GetLastError() << endl;
      break;
    }
  }
  return 0;
}

int main() {
  OPENFILENAMEW ofn;
  ZeroMemory(&ofn, sizeof(ofn));
  ofn.lStructSize = sizeof(OPENFILENAMEW);
  ofn.nMaxFile = MAX_PATH;
  ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_ENABLEHOOK;
  ofn.lpfnHook = OFNHookProc;
  GetOpenFileNameW(&ofn);
  return 0;
}

回答1:

When using OFN_EXPLORER, you have to move hdlg's parent window, as the HWND passed to your callback is not the actual dialog window. This is clearly stated in the documentation:

OFNHookProc callback function

hdlg [in]
A handle to the child dialog box of the Open or Save As dialog box. Use the GetParent function to get the handle to the Open or Save As dialog box.

Also, you should wait for the callback to receive the CDN_INITDONE notification, instead of the WM_INITDIALOG message.

Try this:

static UINT_PTR CALLBACK OFNHookProc (HWND hdlg, UINT uiMsg, WPARAM wParam, LPARAM lParam)
{
  if ((uiMsg == WM_NOTIFY) &&
      (reinterpret_cast<OFNOTIFY*>(lParam)->hdr.code == CDN_INITDONE))
  {
    SetWindowPos(GetParent(hdlg), HWND_TOPMOST, 200, 200, 0, 0, SWP_NOSIZE);
  }
  return 0;
}

来源：https://stackoverflow.com/questions/29931704/how-to-change-position-of-an-openfilename-dialog-in-windows

标签

c++

winapi

dialog