Using Win32 functions in Visual FoxPro Image Gallery
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Enhanced GetFont dialog

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Before you begin:
Comparing to the dialog invoked by the GETFONT(), this one offers few more adjustable parameters: strikeout and underline effects and font color.


See also:
  • GDI+: enumerating fonts installed on the system
  • How to change font name and size in the MessageBox dialog
  • How to position the GETPRINTER() dialog
  • Vertical Label control
  • DO decl 
    
    #DEFINE GMEM_FIXED                 0
    #DEFINE LF_FACESIZE               32
    #DEFINE FW_NORMAL                400
    #DEFINE DEFAULT_CHARSET            1
    #DEFINE OUT_DEFAULT_PRECIS         0
    #DEFINE CLIP_DEFAULT_PRECIS        0
    #DEFINE DEFAULT_QUALITY            0
    #DEFINE DEFAULT_PITCH              0
    #DEFINE CF_SCREENFONTS             1
    #DEFINE CF_INITTOLOGFONTSTRUCT    64
    #DEFINE CF_EFFECTS               256
    #DEFINE CF_FORCEFONTEXIST      65536
    
    *| typedef struct { 
    *|   DWORD        lStructSize;     4
    *|   HWND         hwndOwner;       4
    *|   HDC          hDC;             4
    *|   LPLOGFONT    lpLogFont;       4
    *|   INT          iPointSize;      4
    *|   DWORD        Flags;           4
    *|   COLORREF     rgbColors;       4
    *|   LPARAM       lCustData;       4
    *|   LPCFHOOKPROC lpfnHook;        4
    *|   LPCTSTR      lpTemplateName;  4
    *|   HINSTANCE    hInstance;       4
    *|   LPTSTR       lpszStyle;       4
    *|   WORD         nFontType;       2
    *|   WORD         ___MISSING_ALIGNMENT__; 2
    *|   INT          nSizeMin;        4
    *|   INT          nSizeMax;        4
    *| } CHOOSEFONT, *LPCHOOSEFONT; total: 60 bytes
    
    *| typedef struct tagLOGFONT { 
    *|   LONG lfHeight;                   4
    *|   LONG lfWidth;                    4
    *|   LONG lfEscapement;               4
    *|   LONG lfOrientation;              4
    *|   LONG lfWeight;                   4
    *|   BYTE lfItalic;                   1
    *|   BYTE lfUnderline;                1
    *|   BYTE lfStrikeOut;                1
    *|   BYTE lfCharSet;                  1
    *|   BYTE lfOutPrecision;             1
    *|   BYTE lfClipPrecision;            1
    *|   BYTE lfQuality;                  1
    *|   BYTE lfPitchAndFamily;           1 
    *|   TCHAR lfFaceName[LF_FACESIZE];  32
    *| } LOGFONT, *PLOGFONT; total: 60 bytes
    
        LOCAL lcChooseFont, lcLogFont, hLogFont, lcFontFace
    
        * initializing LOGFONT structure:
        * Times New Roman, Italic
        lcLogFont = num2dword(16) +;
            num2dword(0)  +;
            num2dword(0)  +;
            num2dword(0)  +;
            num2dword(FW_NORMAL) +;
            Chr(1) +;
            Chr(0) +;
            Chr(0) +;
            Chr(DEFAULT_CHARSET)     +;
            Chr(OUT_DEFAULT_PRECIS)  +;
            Chr(CLIP_DEFAULT_PRECIS) +;
            Chr(DEFAULT_QUALITY)     +;
            Chr(DEFAULT_PITCH)       +;
            PADR("Times New Roman"+Chr(0),32)
    
        * copying the LOGFONT data into the global memory object
        * because CHOOSEFONT structure uses the pointer
        lnLogFontSize = 60
        hLogFont = GlobalAlloc(GMEM_FIXED, lnLogFontSize)
    
        * this function is re-declared below
        * with different parameter types
        DECLARE RtlMoveMemory IN kernel32 As String2Heap;
            INTEGER Destination, STRING @ Source,;
            INTEGER nLength
        = String2Heap (hLogFont, @lcLogFont, lnLogFontSize)
    
        * initializing CHOOSEFONT structure
        lcChooseFont = num2dword(60) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(hLogFont) +;
            num2dword(0) +;
            num2dword(CF_SCREENFONTS + CF_EFFECTS +;
                CF_INITTOLOGFONTSTRUCT + CF_FORCEFONTEXIST) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0) +;
            num2dword(0)
    
        IF ChooseFont (@lcChooseFont) <> 0
        * displaying selection
            * re-declaring API function with different parameters
            DECLARE RtlMoveMemory IN kernel32 As Heap2String;
                STRING @Dest, INTEGER Source, INTEGER nLength
    
            * copying data from the global memory object to VFP string
            = Heap2String (@lcLogFont, hLogFont, lnLogFontSize)
    
            ? "*** CHOOSEFONT Structure:"
            ? "Point size:", buf2dword(SUBSTR(lcChooseFont, 17,4))
            ? "RGB color: ", buf2dword(SUBSTR(lcChooseFont, 25,4))
    
            ?
            ? "*** LOGFONT Structure:"
            ? "Font Weight:", buf2dword(SUBSTR(lcLogFont, 17,4))
            ? "Italic:     ", Iif(Asc(SUBSTR(lcLogFont, 21,1))=0, "No","Yes")
            ? "Underline:  ", Iif(Asc(SUBSTR(lcLogFont, 22,1))=0, "No","Yes")
            ? "Strikeout:  ", Iif(Asc(SUBSTR(lcLogFont, 23,1))=0, "No","Yes")
    
            lcFontFace = SUBSTR(lcLogFont, 29)
            lcFontFace = SUBSTR(lcFontFace, 1, AT(Chr(0),lcFontFace)-1)
            ? "Font Face:  ", lcFontFace
        ENDIF
    
        * releasing system resources
        = GlobalFree (hLogFont)
    RETURN
    
    PROCEDURE  decl
        DECLARE INTEGER ChooseFont IN comdlg32 STRING @lpcf
        DECLARE INTEGER GlobalFree IN kernel32 INTEGER hMem
        DECLARE INTEGER GlobalAlloc IN kernel32;
            INTEGER wFlags,;
            INTEGER dwBytes
    
    FUNCTION  num2dword (lnValue)
    #DEFINE m0       256
    #DEFINE m1     65536
    #DEFINE m2  16777216
        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)
    
    FUNCTION  buf2dword (lcBuffer)
    RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
        Asc(SUBSTR(lcBuffer, 2,1)) * 256 +;
        Asc(SUBSTR(lcBuffer, 3,1)) * 65536 +;
        Asc(SUBSTR(lcBuffer, 4,1)) * 16777216
    
    

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    4817 bytes  
    Created: 2001-09-20 12:00:00  
    Modified: 2009-02-25 15:22:31  
    Visits in 7 days: 40  
    Listed functions:
    ChooseFont
    GlobalAlloc
    GlobalFree
    Printer friendly API declarations
    My comment:
    GETFONT(cFontName [, nFontSize [, cFontStyle [, nFontCharSet])
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