如何设置单个静态控件C++的文本和背景颜色？

Question

当我将所有静态和编辑控件设置为相同颜色时，我已经设法设置它们的颜色，但我不知道如何在不影响其他控件的情况下仅设置其中一个的颜色。我在互联网上环顾四周，但我发现的内容都不是关于如何设置一个静态或编辑控件的颜色。这是我目前用来设置所有静态文本字段的颜色的代码：

#include <windows.h>

LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

HWND staticTextField, staticTextFieldTwo;

char szClassName[ ] = "WindowsApp";

int WINAPI WinMain(HINSTANCE hThisInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpszArgument,
                   int nFunsterStil)

{
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;

    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;
    wincl.style = CS_DBLCLKS; 
    wincl.cbSize = sizeof (WNDCLASSEX);

    wincl.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;
    wincl.cbClsExtra = 0;
    wincl.cbWndExtra = 0;
    wincl.hbrBackground = CreateSolidBrush(RGB(0, 255, 255));

    if (!RegisterClassEx (&wincl))
        return 0;

    hwnd = CreateWindowEx (
       0,
       szClassName,
       "Windows app",
       WS_OVERLAPPED | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,
       CW_USEDEFAULT,
       CW_USEDEFAULT,
       544,
       375,
       HWND_DESKTOP,
       NULL,
       hThisInstance,
       NULL
    );

    ShowWindow (hwnd, nFunsterStil);

    while (GetMessage (&messages, NULL, 0, 0))
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }

    return messages.wParam;
}


LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam,
LPARAM lParam)
{
    HDC hdcStatic = (HDC)wParam;

switch (message)
{
    case WM_DESTROY:
        PostQuitMessage (0);
        break;
    case WM_CREATE:

         staticTextField = CreateWindow("STATIC", "static 1", WS_VISIBLE 
         | WS_CHILD, 20, 20, 300, 25, hwnd, NULL, NULL, NULL);


         staticTextFieldTwo = CreateWindow("STATIC", "static2", WS_VISIBLE | 
         WS_CHILD | WS_BORDER, 100, 200, 300, 20, hwnd, NULL, NULL, NULL);

         break;
    case WM_CTLCOLORSTATIC:
        SetTextColor(hdcStatic, RGB(255, 0, 0));
        SetBkColor(hdcStatic, RGB(0, 255, 255));
        return (INT_PTR)CreateSolidBrush(RGB(0, 255, 255));
        break;
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
}

return 0;
}

Answer 1

当响应 时WM_CTLCOLORSTATIC，检查lParam哪个持有控件的句柄。

CreateSolidBrush创建一个 GDI 对象。应该删除它，DeleteObject否则会导致资源泄漏。您可以将画笔声明为static并在最后将其删除。例子：

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HBRUSH hbrush = NULL;
    switch(message)
    {
    case WM_DESTROY:
        if (hbrush) DeleteObject(hbrush);
        hbrush = NULL;
        PostQuitMessage(0);
        break;
    case WM_CREATE:
        staticTextField = CreateWindow("STATIC", "static 1", WS_VISIBLE
            | WS_CHILD, 20, 20, 300, 25, hwnd, NULL, NULL, NULL);
        staticTextFieldTwo = CreateWindow("STATIC", "static2", WS_VISIBLE |
            WS_CHILD | WS_BORDER, 100, 200, 300, 20, hwnd, NULL, NULL, NULL);
        break;
    case WM_CTLCOLORSTATIC:
    {
        HDC hdcStatic = (HDC)wParam;
        if(lParam == (LPARAM)staticTextFieldTwo)
        {
            SetTextColor(hdcStatic, RGB(0, 255, 0));
            SetBkColor(hdcStatic, RGB(0, 255, 255));
            if (!hbrush)
                hbrush = CreateSolidBrush(RGB(0, 255, 255));
            return (LRESULT)hbrush;
        }
        break;
    }
    default:
        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}