Question

我想在vc ++窗口中更改标签。标签显示实时数据，每100毫秒更新一次。那么我怎么能在vc ++窗口中这样做呢？任何人请帮忙

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HWND hRPMEx,hAvgTimeEx;
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch(message)
    {
    case WM_TIMER:
        break;

    case WM_CREATE:
        hRPMEx  = CreateWindowA("Static","",WS_CHILD | WS_VISIBLE | SS_LEFT,
            20,100,220,25,
            hWnd, (HMENU)IDC_RPM_EX, hInstance, NULL);  

        hAvgTimeEx  = CreateWindowA("Static","",WS_CHILD | WS_VISIBLE | SS_LEFT, 
            20,150,220,25,
            hWnd, (HMENU)IDC_AVGTIME_EX, hInstance, NULL);  
        break;

    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // Parse the menu selections:

        switch (wmId)
        {
        case IDC_BTN_CONNECT:
            break;

        case IDC_RPM_EX:
            break;

        case IDC_BTN_DISCONNECT:
            break;

        case IDM_ABOUT:
            DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
            break;

        case IDM_OPEN:
            break;

        case IDM_EXIT:
            break;

        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }

        break;

    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        EndPaint(hWnd, &ps);
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }

return 0;
}

我应该在哪里调用更新标签的函数（静态文本）

Answer 1

两件事：

要定期更新内容，您可以使用计时器。一个例子：

    // To set the timer
    SetTimer(hwnd,             // handle to main window 
    IDT_TIMER1,            // timer identifier 
    10000,                 // 10-second interval 
    (TIMERPROC) NULL);     // no timer callback 

    // In you WindProc Callback :
    case WM_TIMER:
    {
        if ( wParam == IDT_TIMER1)
        {
              // put your code here
        } 

    }

此处的示例：http://msdn.microsoft.com/en-us/library/windows/desktop/ms644901(v=vs.85).aspx

要更改窗口的标签：

BOOL WINAPI SetWindowText(
  _In_      HWND hWnd,
  _In_opt_  LPCTSTR lpString
);

此处的示例：http://msdn.microsoft.com/en-us/library/windows/desktop/ms633546(v=vs.85).aspx

在窗口中更改标签

1 个答案: