Question

我想将父窗口设为非透明，RGB值为（99,99,99）？以前我的窗口是透明的，但现在我要求窗口不透明。

下面提到的是与我父窗口相关的功能：

ATOM MyRegisterClass(HINSTANCE hInstance)
{
    LogEntry(L"Entered in myRegisterClass Function");

    WNDCLASS CLASS_NAME_ONE_SEG_APP;
    CLASS_NAME_ONE_SEG_APP.cbClsExtra = 0;
    CLASS_NAME_ONE_SEG_APP.cbWndExtra = 0;
    CLASS_NAME_ONE_SEG_APP.hbrBackground = 0;
    CLASS_NAME_ONE_SEG_APP.hCursor = 0;
    CLASS_NAME_ONE_SEG_APP.hIcon = 0;
    CLASS_NAME_ONE_SEG_APP.hInstance = hInstance;
    CLASS_NAME_ONE_SEG_APP.lpfnWndProc =  (WNDPROC) WndProc;
    CLASS_NAME_ONE_SEG_APP.lpszClassName = className;
    CLASS_NAME_ONE_SEG_APP.lpszMenuName = 0;
    CLASS_NAME_ONE_SEG_APP.style = 0;

    LogEntry(L"Exiting from myRegisterClass Function");

    return RegisterClass(&CLASS_NAME_ONE_SEG_APP); 
}

下面提到的是一个InitInstance函数，我在其中创建父窗口。

handles.parent是我的父窗口。

bool WINAPI InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    LogEntry(L"Entered in InitInstance Function");
    handles.parent = CreateWindowEx(0,
                                    className,
                                    windowName, 
                                    WS_VISIBLE | WS_POPUP,
                                    0, 0, 
                                    coordinates.width, coordinates.height,
                                    NULL, 
                                    NULL, 
                                    hInstance, 
                                    NULL);

    if(handles.parent == NULL)
    {
        LogValue(L"Cannot Create Parent Window"
            L"\nInitInstance Function terminated abnormally");
        return false;
    }
    else
    {
        UpdateWindow(handles.parent);
        ShowWindow(handles.parent, nCmdShow);
        LogEntry(L"Exiting from InitInstance Function");
        return true;
    }
}

以下提到的是WM_PAINT的函数：

case WM_PAINT:
        LogEntry(L"Entred in WM_PAINT");
        PaintWindow(); 
        SetFocus(handles.parent);
        LogEntry(L"Exited from WM_PAINT");
        break;

这个PaintWindow执行以下操作.....

void PaintWindow()
{
    LogEntry(L"Entered in PaintWindow Function");
    HWND *handle = &handles.volUp;

    //Paint Buttons on the window
    for(register char i =  MIN_BUTTON; i <= MAX_BUTTON; i++)
    {
        PaintButton( (INITIAL_BUTTON + i) , *handle, btns, i);
        handle++;
    }

    //Paint the AXIS_VOL_ON_OFF Button According to its Status
    if(volumeStatus.status == VOLUME_ON)
        PaintButton(IDB_BTN_VOL_OFF, handles.volOnOff, btns, AXIS_VOL_ON_OFF);
    else if(volumeStatus.status = VOLUME_MUTE)
        PaintButton(IDB_BTN_VOL_ON, handles.volOnOff, btns, AXIS_VOL_ON_OFF);

    //Paint Images on the window
    if(handles.screenMode == SCREEN_MODE_OPERATION)
        InsertImages();

    LogEntry(L"Exited from PaintWindow Function");
}

提前致谢......

Answer 1

您需要为您的班级提供非空背景画笔

  CLASS_NAME_ONE_SEG_APP.hbrBackground = CreateSolidBrush(RGB((99,99,99));

在WindowProc中，您需要确保将WM_ERASEBKGND消息传递给DefWindowProc。（那部分可能已经发生了）

后来

好的，你的WM_PAINT代码做错了。处理WM_PAINT消息时，请务必调用BeginPaint和EndPaint，并且必须使用绘制时从BeginPaint获取的HDC。

case WM_PAINT:
    {
    LogEntry(L"Entred in WM_PAINT");

    PAINTSTRUCT ps;
    HDC hdc = BeginPaint(&ps);
    PaintWindow(hdc); 
    EndPaint(hwnd, &ps);

    LogEntry(L"Exited from WM_PAINT");
    }  
    break;

您的窗口是透明的，因为您从未在WM_PAINT处理程序中调用BeginPaint，因此您永远不会在屏幕上绘制任何内容。

有关更完整的示例，请参阅Drawing in the Client Area。

如何使窗口不透明？

1 个答案:

后来