十万火鸡，如何捕获任意进程中的windows 控件的句柄？？

Question

BCB代码：
void __fastcall TMainForm::IconImageMouseMove(TObject *Sender,
      TShiftState Shift, int X, int Y)
{
        if(Flag){
          char temp[255],temp1[255];
          TPoint *NowPoint = new TPoint(0,0);          GetCursorPos(NowPoint);         //取得光标位置
          MainWnd = WindowFromPoint(*NowPoint);          //取得窗口句柄
          if(GetClassName(MainWnd,temp,sizeof(temp)) > 0){  //获得类名
                StatusBar->SimpleText = "";
                StatusBar->SimpleText = StatusBar->SimpleText + "类名：" + temp;
                GetWindowText(MainWnd,temp1,sizeof(temp1));
                StatusBar->SimpleText = StatusBar->SimpleText + "文字：" + temp1;
                if(!(AnsiString(temp)).AnsiCompare(AnsiString("TEdit"))){//是编辑框
                        if(((GetWindowLong(MainWnd,GWL_STYLE)&ES_PASSWORD)!=0)&&Flag){//有密码风格
                        (long)OldProc = GetWindowLong(MainWnd,GWL_WNDPROC);
                        SetWindowLong(MainWnd,GWL_WNDPROC,long(NewProc));
                        Flag = false;
                    }
                 }
          }
          delete NowPoint;
        }
}

Answer 1

注意：
if(((GetWindowLong(MainWnd,GWL_STYLE)&ES_PASSWORD)!=0)&&Flag){//有密码风格
                        (long)OldProc = GetWindowLong(MainWnd,GWL_WNDPROC);
                        SetWindowLong(MainWnd,GWL_WNDPROC,long(NewProc));
                        有错误！