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Before you begin:
Calling SystemParametersInfo with SPI_GETNONCLIENTMETRICS input parameter populates the NONCLIENTMETRICS structure.

This structure contains the metrics associated with the nonclient area of a nonminimized window. Among the metrics included are the settings for 5 fonts (LOGFONT structures), the OS uses for drawing captions, small captions, menus, status bars and message boxes.

See also:
  • Displaying icons and descriptions associated with files and folders
  • #DEFINE SPI_GETNONCLIENTMETRICS 0x0029
    #DEFINE NONCLIENTMETRICS_SIZE 0x0154
    #DEFINE LOGFONT_SIZE 0x003c
    #DEFINE LOGPIXELSY 0x005a
    
    DO declare
    
    LOCAL cNonClientMetrics, cLogFont
    
    * populating NONCLIENTMETRICS structure
    * the size of the structure occupies first 4 bytes
    cNonClientMetrics=num2dword(NONCLIENTMETRICS_SIZE)
    
    * padding the structure to the required size
    cNonClientMetrics=PADR(cNonClientMetrics,;
        NONCLIENTMETRICS_SIZE, CHR(0))
    
    * retrieving the metrics associated with the nonclient area
    * of nonminimized windows
    IF SystemParametersInfo(SPI_GETNONCLIENTMETRICS,;
        NONCLIENTMETRICS_SIZE, @cNonClientMetrics, 0) = 0
    
        ? "SystemParametersInfo call failed:", GetLastError()
        RETURN
    ENDIF
    
    * among other metrics, populated NONCLIENTMETRICS structure
    * contains data for 5 fonts used for drawing:
    * captions, small captions, menus, status bar and message boxes
    LOCAL oCaptionFont As clsLogFont, oSmCaptionFont As clsLogFont,;
        oMenuFont As clsLogFont, oStatusFont As clsLogFont,;
        oMessageFont As clsLogFont
    
    oCaptionFont = CREATEOBJECT("clsLogFont",;
        SUBSTR(cNonClientMetrics, 25, LOGFONT_SIZE))
    
    oSmCaptionFont = CREATEOBJECT("clsLogFont",;
        SUBSTR(cNonClientMetrics, 93, LOGFONT_SIZE))
    
    oMenuFont = CREATEOBJECT("clsLogFont",;
        SUBSTR(cNonClientMetrics, 161, LOGFONT_SIZE))
    
    oStatusFont = CREATEOBJECT("clsLogFont",;
        SUBSTR(cNonClientMetrics, 221, LOGFONT_SIZE))
    
    oMessageFont = CREATEOBJECT("clsLogFont",;
        SUBSTR(cNonClientMetrics, 281, LOGFONT_SIZE))
    
    * Vista: Segoe UI, 9, N, 1
    * WinXP: Tahoma, 9, N, 1
    ? oMessageFont.GetFontDesc()
    * end of main
    
    PROCEDURE declare
        DECLARE INTEGER GetLastError IN kernel32
        DECLARE INTEGER GetWindowDC IN user32 INTEGER hWindow
    
        DECLARE INTEGER SystemParametersInfo IN user32;
            INTEGER uiAction, INTEGER uiParam,;
            STRING @pvParam, INTEGER fWinIni
    
        DECLARE INTEGER GetDeviceCaps IN gdi32;
            INTEGER hdc, INTEGER nIndex
    
        DECLARE INTEGER ReleaseDC IN user32;
            INTEGER hWindow, INTEGER hDC
    
    FUNCTION buf2dword(cBuffer)
    RETURN Asc(SUBSTR(cBuffer, 1,1)) + ;
        BitLShift(Asc(SUBSTR(cBuffer, 2,1)),  8) +;
        BitLShift(Asc(SUBSTR(cBuffer, 3,1)), 16) +;
        BitLShift(Asc(SUBSTR(cBuffer, 4,1)), 24)
    
    FUNCTION num2dword(lnValue)
    #DEFINE m0 0x0000100
    #DEFINE m1 0x0010000
    #DEFINE m2 0x1000000
        IF lnValue < 0
            lnValue = 0x100000000 + lnValue
        ENDIF
        LOCAL b0, b1, b2, b3
        b3 = Int(lnValue/m2)
        b2 = Int((lnValue - b3*m2)/m1)
        b1 = Int((lnValue - b3*m2 - b2*m1)/m0)
        b0 = Mod(lnValue, m0)
    RETURN Chr(b0)+Chr(b1)+Chr(b2)+Chr(b3)
    
    DEFINE CLASS clsLogFont As Relation
    * implements LOGFONT structure
        lfHeight=0
        lfWidth=0
        lfEscapement=0
        lfOrientation=0
        lfWeight=0
        lfItalic=.F.
        lfUnderline=.F.
        lfStrikeOut=.F.
        lfCharSet=0
        lfOutPrecision=0
        lfClipPrecision=0
        lfQuality=0
        lfPitchAndFamily=0
        lfFaceName=""
    
    PROCEDURE Init(cBuf As String)
        WITH THIS
            .lfHeight=buf2dword(SUBSTR(cBuf,1,4))
            .lfWidth=buf2dword(SUBSTR(cBuf,5,4))
            .lfEscapement=buf2dword(SUBSTR(cBuf,9,4))
            .lfOrientation=buf2dword(SUBSTR(cBuf,13,4))
            .lfWeight=buf2dword(SUBSTR(cBuf,17,4))
            .lfItalic = (ASC(SUBSTR(cBuf,21,1)) <> 0)
            .lfUnderline = (ASC(SUBSTR(cBuf,22,1)) <> 0)
            .lfStrikeOut = (ASC(SUBSTR(cBuf,23,1)) <> 0)
            .lfCharSet=ASC(SUBSTR(cBuf,24,1))
            .lfOutPrecision=ASC(SUBSTR(cBuf,25,1))
            .lfClipPrecision=ASC(SUBSTR(cBuf,26,1))
            .lfQuality=ASC(SUBSTR(cBuf,27,1))
            .lfPitchAndFamily=ASC(SUBSTR(cBuf,28,1))
            .lfFaceName=STRTRAN(SUBSTR(cBuf,29,32), CHR(0),"")
        ENDWITH
    
    PROCEDURE GetFontDesc() As String
    * returns GETFONT() style description for the font:
    * cFontName, nFontSize, cFontStyle, nFontCharSet
    WITH THIS
        LOCAL cFontStyle, nFontSize
        cFontStyle=""
        cFontStyle=cFontStyle+IIF(.lfWeight > 400, "B", "")
        cFontStyle=cFontStyle+IIF(.lfItalic, "I", "")
        cFontStyle=cFontStyle+IIF(.lfUnderline, "U", "")
        cFontStyle=cFontStyle+IIF(.lfStrikeOut, "S", "")
        cFontStyle=IIF(EMPTY(cFontStyle), "N", cFontStyle)
    
        RETURN .lfFaceName + ", " +;
            TRANSFORM(.GetFontSize()) + ", " +;
            m.cFontStyle + ", " + TRANSFORM(.lfCharSet)
    
    ENDWITH
    
    FUNCTION GetFontSize() As Number
    * converts the font height to font size;
    * note that in this particular case the font height is a negative value
        LOCAL hWindow, hDC, nPxPerInchY
        hWindow=_screen.HWnd
        hDC=GetWindowDC(hWindow)
        nPxPerInchY = GetDeviceCaps(hDC, LOGPIXELSY)
        ReleaseDC(hWindow, hDC)
    RETURN ROUND((ABS(THIS.lfHeight) * 72) / nPxPerInchY, 0)
    
    ENDDEFINE
    

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    4487 bytes  
    Created: 2009-11-21 22:21:09  
    Modified: 2009-12-09 10:58:43  
    Visits in 7 days: 118  
    Listed functions:
    GetDeviceCaps
    GetLastError
    GetWindowDC
    ReleaseDC
    SystemParametersInfo
    Printer friendly API declarations
    My comment:
    Normally all 5 fonts have identical settings.
    Vista: Segoe UI, 9, N, 1
    WinXP: Tahoma, 9, N, 1
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