Question

在随后的代码中，Miriam字体在WM_CREATE中创建，其姓氏在静态OUTLINETEXTMETRIC struct中获取，由s_potm指向。然后我在otmpFamilyName中展示了此结构的成员WM_PAINT，并在窗口客户端区域上打印了字符Arial，而不是Miriam。但是没有理由进行这种字体替换，因为Windows 7中存在字体文件mriam.ttf。任何解释？

#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, UINT, LONG);

int APIENTRY WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pszCmdLine, int nCmdShow)
{
    WNDCLASSEX  wndclassx;

    wndclassx.cbSize        = sizeof(WNDCLASSEX);
    wndclassx.style         = CS_HREDRAW | CS_VREDRAW;
    wndclassx.lpfnWndProc   = WndProc;
    wndclassx.cbClsExtra    = 0;
    wndclassx.cbWndExtra    = 0;
    wndclassx.hInstance     = hInstance;
    wndclassx.hIcon         = 0;
    wndclassx.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wndclassx.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wndclassx.lpszMenuName  = 0;
    wndclassx.lpszClassName = L"WndProc";
    wndclassx.hIconSm       = 0;

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

    HWND hWnd = CreateWindow(L"WndProc", 0, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
                             0, 0, hInstance, 0);

    ShowWindow(hWnd, SW_SHOWNORMAL);
    UpdateWindow(hWnd);

    MSG msg;

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

    //  Retorna msg.wParam

    return (int)msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, UINT wParam, LONG lParam)
{
    static OUTLINETEXTMETRIC* s_potm;

    switch ( message )
    {
        case WM_CREATE:
        {
            HDC hDC;
            if( !(hDC = CreateIC(L"Display", nullptr, nullptr, nullptr)) ) return -1;

            LOGFONT lf;
            memset(&lf, 0, sizeof(LOGFONT));
            lf.lfHeight = 20;
            lf.lfOutPrecision = OUT_TT_ONLY_PRECIS;
            wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Miriam");

            HFONT hFont;
            if( !(hFont = CreateFontIndirect(&lf)) )
            {
                DeleteDC(hDC);
                return -1;
            }

             hFont = (HFONT)SelectObject(hDC, hFont);

             int ix = GetOutlineTextMetrics(hDC, 0, nullptr);

             s_potm = (OUTLINETEXTMETRIC*)new char[ix];

             GetOutlineTextMetrics(hDC, ix, s_potm); 

             DeleteObject(SelectObject(hDC, hFont));
             DeleteDC(hDC);
        }
        break;

        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            BeginPaint(hwnd, &ps);
            wchar_t* p = (wchar_t*)((BYTE*)s_potm + (int)s_potm->otmpFamilyName);
            TextOut(ps.hdc, 10, 20, p, wcslen(p)); 
            EndPaint(hwnd, &ps);
        }
        break;

        case WM_DESTROY:

        PostQuitMessage(0);
        break;

        default:

        return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

编辑：字体MT Extra

也会发生同样的事情

Answer 1

当您向Windows询问字体时，它会尽力匹配您在LOGFONT结构中列出的所有条件。某些字段优先于其他字段。您已将大部分值保留为零。

我认为在这种情况下，lfCharSet字段会让你失望。零等于ANSI_CHARSET，但Miriam看起来不像ANSI字体。

MSDN文档说明了lfCharSet：

此参数在字体映射过程中很重要。要确保结果一致，请指定特定字符集。如果在lfFaceName成员中指定字体名称，请确保lfCharSet值与lfFaceName中指定的字体的字符集匹配。

当我从Windows请求“Miriam”字体时，我得到一个“Arial”字体。这怎么可能，因为我的系统中存在字体文件“mriam.ttf”？

1 个答案: