设置MessageBox的位置？ [英] Set location of MessageBox?

问题描述

我想使用MessageBox（或类似的东西）打印一条消息。我也想要控制在屏幕上的确切的框出现，但可以找到没有什么在MessageBox的允许您控制位置的描述。我错过了什么吗？如果MessageBox不能使用，那么是否有另一种方法？

I want to print out a message using MessageBox (or similar). I would also like control over where exactly on the screen the box appears but can find nothing in the description of MessageBox that allows you control over the location. Did I miss something? If MessageBox can not be used, then is there an alternative?

由于太复杂而不能进入这里的原因，我更喜欢一个不涉及自己并传递回调函数的地址。

For reasons too complex to go into here, I would prefer an answer which didn't involve making my own window and passing the address of a callback function.

推荐答案

步骤1：陷阱创建消息框：

// global hook procedure
HHOOK hhookCBTProc = 0;

LRESULT CALLBACK pfnCBTMsgBoxHook(int nCode, WPARAM wParam, LPARAM lParam)
{
  if (nCode == HCBT_CREATEWND)
  {
    CREATESTRUCT *pcs = ((CBT_CREATEWND *)lParam)->lpcs;

    if ((pcs->style & WS_DLGFRAME) || (pcs->style & WS_POPUP))
    {
      HWND hwnd = (HWND)wParam;

      // At this point you have the hwnd of the newly created 
      // message box that so you can position it at will
      SetWindowPos(hwnd, ...);
    }
  }

  return (CallNextHookEx(hhookCBTProc, nCode, wParam, lParam));
}

步骤2：然后显示消息框：

// set hook to center the message box that follows
hhookCBTProc = SetWindowsHookEx(WH_CBT, 
                                pfnCBTMsgBoxHook, 
                                0, GetCurrentThreadId());

int sResult = MessageBox(hwndParent, pszMsg, pszTitle, usStyle);

// remove the hook
UnhookWindowsHookEx(hhookCBTProc);

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