getMessage 内部的无限循环(DispatchMessage(&msg);不起作用)

Question

我正在使用资源编辑器创建一个按钮应用程序。创建按钮后，我尝试这样做-

 m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this);

        if (m_hwndPreview == NULL)
        {
          hr = HRESULT_FROM_WIN32(GetLastError());
        }
    MSG  msg;
        BOOL bRet;
        while ( (bRet=GetMessage (& msg,0, 0,0)) != 0)
        {// this msg always contains the data like -msg = {msg=0x0000c03e wp=0x0000000000000012//always 12 I don't know why ??  lp=0x0000000000000000}
            if (bRet == -1)
            {
                bRet = HRESULT_FROM_WIN32(GetLastError());
                MessageBox(NULL, L"Hurr  i am the error",L"Error",MB_ICONERROR | MB_OK);
            }
            else if (!IsDialogMessage (m_hwndPreview, & msg))
            {
                 TranslateMessage (&msg); //on debugging  TranslateMessage = 0x000007feee615480 TranslateMessage
                 DispatchMessage(& msg ); //but show nothing when I put cursor on this method to know the value that means it's not called
                 MessageBox(NULL, L"there is no error in receiving before dispatch the message",L"Error", 
                 MB_ICONERROR | MB_OK);//this messagebox  repeats again and again after the call to DialogProc function and I am not able to come out of the loop and here I need to restart my PC

在其他地方，我定义createdialog函数如下-//这个函数是在createDialogParam（）函数上调用的。在它之后，控件转到getmessage，在那里一切都循环。

BOOL CALLBACK AMEPreviewHandler::DialogProc(HWND m_hwndPreview, UINT Umsg, WPARAM wParam, LPARAM lParam) 
    { //this dialogProc function is declares Static some where in the code otherwise the createdialogparam will give error DLGPROC  is invalid conversion
//this Umsg alays creates strange value like 48 and 32 etc.. and Wparam contains a very big value like 12335423526 (I mean big and strange) and lparam contains 0.
        switch(Umsg)
        {
        case WM_INITDIALOG: 
            {
                MessageBox(NULL, L"Inside the WM_INITDIALOG function",L"Error", 
                MB_ICONERROR | MB_OK);
            return TRUE;
            }
            break;
        case WM_CREATE:
            {
            /////////////////
            MessageBox(NULL, L"Inside the WM_CREATE",L"Error", 
                MB_ICONERROR | MB_OK);
            /////////////////////////////////
            }
            break;
        case WM_COMMAND:
            {   //here are my two buttons created by me which should show messagebox on click
                int ctl = LOWORD(wParam);
                int event = HIWORD(wParam);//I don't know why this event is in blue colour ..  but its not the pqrt of problem right now.
                if (ctl == IDC_PREVIOUS && event == BN_CLICKED ) 
                {         
                    MessageBox(m_hwndPreview,L"Button  Clicked is next inside WM_COMMAND ",L"BTN WND",MB_ICONINFORMATION); 
                    return 0;
                }         
                if (ctl == IDC_NEXT && event == BN_CLICKED ) 
                {         
                    MessageBox(m_hwndPreview,L"Button  Clicked is previous inside WM_COMMAND",L"BTN WND",MB_ICONINFORMATION);
                    return 0;
                }         
                return FALSE;
            }break;

        case WM_DESTROY:
            {
                ////////////////::
                    MessageBox(NULL, L"Inside the WM_DESTROY",L"Error", 
                MB_ICONERROR | MB_OK);
                    //////////////////
                PostQuitMessage(0);
                return 0;
            }
            break;
            case WM_CLOSE:
                {
                    MessageBox(NULL, L"Inside the WM_CLOSE",L"Error", 
                MB_ICONERROR | MB_OK);
                    DestroyWindow (m_hwndPreview);
                    return TRUE;            
                }
                break;          
        }
                MessageBox(NULL, L"outside the DefWindowProc function",L"Error", 
                MB_ICONERROR | MB_OK);
        return 0;
    }

出现的问题是，当我首次亮相时，控件首先转到CreateDialogParam，然后转到getmessage，其中控件没有从循环中出来，导致重新启动问题。我并没有在预览窗格中显示按钮和图像。如果一切顺利，我希望在调试后，它应该在预览窗格上显示图片，我有两个按钮"下一步"one_answers"上一步"，但它只显示一个空白窗口（我已经使用资源编辑器创建了按钮和照片…这是正确的，我确信这一点）。。但我不知道为什么我没有输出getmessage函数，也没有调用dispatchmessage（因为我在调试中看到了）。

Answer 1

因此，现在您可以尝试注释getmessage部分代码，如果问题出现，该代码可能会被排除，因为您正在使用IDD_MAINDIALOG创建按钮，并且您的createdialogparam直接调用您的dailogproc函数，在该函数中您将接收WM_COMMAND，并由代码处理。

Answer 2

您应该编写

return true;

就在DispatchMessage（msg）之后；

然后调试它，并将调试结果通知我。