为什么easyx在按钮上写的文字显示一团黑


RECT R1 = { 30,625,130,675 };
    RECT R2 = { 1170,625,1270,675};
    LOGFONT f;
    gettextstyle(&f);
    _tcscpy(f.lfFaceName, _T("宋体"));
    f.lfQuality = ANTIALIASED_QUALITY;
    settextstyle(&f);
    settextcolor(BLACK);
    drawtext("你们好啊", &R1, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    drawtext("吃饭了吗", &R2, DT_CENTER | DT_VCENTER | DT_SINGLELINE);
    setlinecolor(BLACK);
    rectangle(30, 625, 130, 675);
    rectangle(1170, 625, 1270, 675);
    system("pause");

在按钮上写了文字,显示却是这样的,这是为什么?

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