为什么在字体对话框中不显示 SYSTEM_FONT 的字体大小？

Question

#include <windows.h>


LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
    case WM_RBUTTONUP:
        {
            HFONT hFont;
            LOGFONT lf;
            CHOOSEFONT cf = {0};

            hFont = (HFONT)GetStockObject(SYSTEM_FONT);
            GetObject(hFont, sizeof(LOGFONT), &lf);

            cf.Flags = CF_INITTOLOGFONTSTRUCT | CF_SCREENFONTS;
            cf.hwndOwner = hwnd;
            cf.lpLogFont = &lf;
            cf.lStructSize = sizeof(CHOOSEFONT);

            if(ChooseFont(&cf))
            {
            }
        }
        break;

    case WM_DESTROY:
        PostQuitMessage(0);
        break;

    default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nShowCmd)
{
    WNDCLASSEX wc = {0};
    HWND hwnd;
    MSG msg;

    wc.cbSize = sizeof(WNDCLASSEX);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.hCursor = LoadCursor(0, IDC_ARROW);
    wc.hIcon = LoadIcon(0, IDI_APPLICATION);
    wc.hInstance = hInstance;
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = L"MainClass";

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

    hwnd = CreateWindowEx(0, wc.lpszClassName, L"First", WS_OVERLAPPEDWINDOW,
        50, 30, 400, 200, 0, 0, hInstance, 0);

    if(!hwnd)
        return 0;

    ShowWindow(hwnd, nShowCmd);

    while(GetMessage(&msg, 0, 0, 0) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int)msg.wParam;


}

字体对话框中大小组合框的编辑框中没有显示正确的字体大小。这是在 windows xp sp3 中测试的。不知道在其他操作系统中是否会发生这种情况。为什么没有显示正确的字体大小？

Answer 1

SYSTEM_FONT 似乎是 Microsoft 多年未使用的损坏常量，它指向的字体不是 TrueType 或 OpenType。 SYSTEM_FONT 和 DEFAULT_GUI_FONT 已经很老了，几乎肯定会被弃用；我建议您不要使用它们。

来自 GetStockObject 的文档：

It is not recommended that you employ this method to obtain the current font used by dialogs and windows. Instead, use the SystemParametersInfo function with the SPI_GETNONCLIENTMETRICS parameter to retrieve the current font. SystemParametersInfo will take into account the current theme and provides font information for captions, menus, and message dialogs.

它还说：

It is not recommended that you use DEFAULT_GUI_FONT or SYSTEM_FONT to obtain the font used by dialogs and windows.

另见 http://weblogs.asp.net/kdente/394499

为什么在字体对话框中不显示 SYSTEM_FONT 的字体大小？

Why doesn't font size show for SYSTEM_FONT in Font dialog?

c

winapi