小窍门定制系统弹出的对话框

    很多时候,我们会使用系统对话框,比如MessageBox, GetOpenFileName等,而有时我们可能对它做些微调,比如出现的位置,或显示一些附加信息,而这些并不都能够通过API的参数设定.当然小技巧在这就有用的,我们可以设定一个钩子来完成这个工作.

//----------------------------------------------------------------------------

// CBTDlgProc

LRESULT CALLBACK CBTDlgProc(INT nCode, WPARAM wParam, LPARAM lParam)

{

    // Notification that a window is about to be activated.

     // window handle is wParam.

     if(nCode == HCBT_ACTIVATE)

     {

         // check if the window is a find-in-files dialog

         HWND hwnd = (HWND)wParam;

         ……..        // do things you like

          // Don’t forget unhook.

         UnhookWindowsHookEx(g_ hhkDlg);

     }

     else

     {

         // otherwise, continue with any possible chained hooks.

         CallNextHookEx(g_hhkFindInFiles, nCode, wParam, lParam);

     }   

     return 0;

}

 

//-----------------------------------------------------------------------------

// Global variable

HHOOK g_ hhkDlg;

 

//-----------------------------------------------------------------------------

// if you want to customize the system dialog, you may set the hook and call system

//   dialog.

     g_hhkDlg = SetWindowsHookEx(WH_CBT,

                                 &CBTDlgProc,               

                                 0,

                                 GetCurrentThreadId());

     MessageBox(…), GetOpenFileName(…) and so on.

    

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