WinAPI窗口立即关闭

我一直在试着尝试学习WINAPI，但是我创建的窗口立即关闭。正如你看到的那样，当按下W键或按下左键时，它将关闭程序，但是在没有按键被按下的情况下运行它仍会关闭。WinAPI窗口立即关闭

#include <windows.h> 
#include <windowsx.h> 


// the WindowProc function prototype 
LRESULT CALLBACK WindowProc(HWND hWnd, 
    UINT message, 
    WPARAM wParam, 
    LPARAM lParam); 

// the entry point for any Windows program 
int WINAPI WinMain(HINSTANCE hInstance, 
    HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, 
    int nCmdShow) 
{ 
    // the handle for the window, filled by a function 
    HWND hWnd; 
    // this struct holds information for the window class 
    WNDCLASSEX wc; 

    // clear out the window class for use 
    ZeroMemory(&wc, sizeof(WNDCLASSEX)); 

    // fill in the struct with the needed information 
    wc.cbSize = sizeof(WNDCLASSEX); 
    wc.style = CS_HREDRAW | CS_VREDRAW; 
    wc.lpfnWndProc = WindowProc; 
    wc.hInstance = hInstance; 
    wc.hCursor = LoadCursor(NULL, IDC_ARROW); 
    wc.hbrBackground = (HBRUSH)COLOR_WINDOW; 
    wc.lpszClassName = L"WindowClass1"; 

    // register the window class 
    RegisterClassEx(&wc); 

    // create the window and use the result as the handle 
    hWnd = CreateWindowEx(NULL, 
     L"WindowClass1", // name of the window class 
     L"Game", // title of the window 
     WS_OVERLAPPEDWINDOW, // window style 
     1, // x-position of the window 
     1, // y-position of the window 
     1800, // width of the window 
     1000, // height of the window 
     NULL, // we have no parent window, NULL 
     NULL, // we aren't using menus, NULL 
     hInstance, // application handle 
     NULL); // used with multiple windows, NULL 

    // display the window on the screen 
    ShowWindow(hWnd, nCmdShow); 

    // enter the main loop: 

    // this struct holds Windows event messages 
    MSG msg; 

    // wait for the next message in the queue, store the result in 'msg' 
    while (GetMessage(&msg, NULL, 0, 0)) 
    { 
     // translate keystroke messages into the right format 
     TranslateMessage(&msg); 

     // send the message to the WindowProc function 
     DispatchMessage(&msg); 
    } 

    // return this part of the WM_QUIT message to Windows 
    return msg.wParam; 
} 

// this is the main message handler for the program 
LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 
{ 
    // sort through and find what code to run for the message given 
    switch (message) 
    { 
     // this message is read when the window is closed 

    case WM_MOUSEMOVE: 
    { 

     // Retrieve mouse screen position 
     int x = (short)LOWORD(lParam); 
     int y = (short)HIWORD(lParam); 

     // Check to see if the left button is held down: 
     bool leftButtonDown = wParam & MK_LBUTTON; 

     // Check if right button down: 
     bool rightButtonDown = wParam & MK_RBUTTON; 

     if (leftButtonDown == true) 
     { 
      //left click 
      //example lets close the program when press w 
      PostQuitMessage(0); 
      return 0; 
     } 


    } 

    case WM_KEYDOWN: 
    {       
     switch (wParam) 
     { 
     case 'W': 

      //w pressed 
      //example lets close the program when press w 
      PostQuitMessage(0); 
      return 0; 
     } 
    } 

    case WM_DESTROY: 
    { 
     // close the application entirely 
     PostQuitMessage(0); 
     return 0; 
    } 
    default: 
     break; 
    } 

    // Handle any messages the switch statement didn't 
    return DefWindowProc(hWnd, message, wParam, lParam); 
}

来源

2013-12-19 Mackenzie

注意，一些评论是不正确的。 – Mackenzie

风格评论：写'if（condition）'，而不是'if（condition == true）'。 – Roddy

尝试删除此：'返回DefWindowProc（hWnd，消息，wParam，lParam）;'它有什么区别？ – kvr

您的switch声明中没有break。

你最终exetuting

PostQuitMessage(0);

你可以做这样的事情：

case WM_FOO: 
{ 
    if (bar) { 
     return 0; 
    } 
    break; 
}

来源

2013-12-19 14:39:46 manuell

你错过了在你的交换机一些break报表，因此，例如，如果你得到了WM_MOUSEMOVE消息和leftButtonDown != true，执行将落入WM_KEYDOWN等。

最终你到case WM_DESTROY:，它会Post你一个可爱的QuitMessage。另外，通过在调试器中逐句执行声明，可以很容易地发现这种情况。

来源

2013-12-19 14:40:10 icabod

我把休息，但它仍然立即关闭。 – Mackenzie

@MackenzieGoodwin然后更新问题中的代码。 – manuell

@icabod这是我很好，我重新安装了我的垫板的驱动程序。感谢所有人的帮助！ – Mackenzie

请勿通过WM_MOUSEMOVE消息检测点击，而应使用WM_MOUSEDOWN。

问题是您的代码可能是由您点击某个东西启动的，因此当您的窗口获得第一个WM_MOUSEMOVE消息时，该按钮仍然会被按下。代码运行多比手指快..

来源

2013-12-19 14:50:22 Roddy

WinAPI窗口立即关闭

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