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Visual Basic 6 definition

Declare Function ChooseFont Lib "comdlg32.dll" Alias "ChooseFontA" (lpcf As CHOOSEFONT_TYPE) As Long

C# definition

[DllImport("comdlg32.dll", EntryPoint="ChooseFont_Renamed")] public static extern int ChooseFontA(ref ChooseFont pChoosefont)

Description

ChooseFont opens the Choose Font common dialog box. All of the necessary information needed to create the dialog box, as well as all of the information returned from it, is stored in the structure passed as pChooseFont. The logical font information is mostly stored in a LOGFONT structure, which can be used to access that font. ChooseFont Creates a Font dialog box that enables the user to choose attributes for a logical font. System.Windows.Forms.FontDialog constructor Note   Dialog cannot be modified through a hook.

Return Value

If an error occured or the user pressed Cancel, the function returns 0 (use CommDlgExtendedError to get the error code). If the user successfully selected a font, the function returns a non-zero value.

Parameters

lpcf Passes information to and from the Choose Font dialog box. Initialize this before calling the function, and read the necessary information from it afterwards.

Further Information:

For further information on Windows API functions such as these, and how to use these API's in your C# and VB.NET applications, please refer to the book 'Network programming in .NET' (Buy at Amazon UK) (Buy at Amazon US)

Visual Basic 6 example source code
' Display a Choose Font dialog box. Print out the typeface name, point size, ' and style of the selected font. More detail about topics in this example can be found in ' the pages for CHOOSEFONT_TYPE and LOGFONT. Dim cf As CHOOSEFONT_TYPE ' data structure needed for function Dim lfont As LOGFONT ' receives information about the chosen font Dim hMem As Long, pMem As Long ' handle and pointer to memory buffer Dim fontname As String ' receives name of font selected Dim retval As Long ' return value ' Initialize the default selected font: Times New Roman, regular, black, 12 point. ' (Note that some of that information is in the CHOOSEFONT_TYPE structure instead.) lfont.lfHeight = 0 ' determine default height lfont.lfWidth = 0 ' determine default width lfont.lfEscapement = 0 ' angle between baseline and escapement vector lfont.lfOrientation = 0 ' angle between baseline and orientation vector lfont.lfWeight = FW_NORMAL ' normal weight i.e. not bold lfont.lfItalic = 0 ' not italic lfont.lfUnderline = 0 ' not underline lfont.lfStrikeOut = 0 ' not strikeout lfont.lfCharSet = DEFAULT_CHARSET ' use default character set lfont.lfOutPrecision = OUT_DEFAULT_PRECIS ' default precision mapping lfont.lfClipPrecision = CLIP_DEFAULT_PRECIS ' default clipping precision lfont.lfQuality = DEFAULT_QUALITY ' default quality setting lfont.lfPitchAndFamily = DEFAULT_PITCH Or FF_ROMAN ' default pitch, proportional with serifs lfont.lfFaceName = "Times New Roman" & vbNullChar ' string must be null-terminated ' Create the memory block which will act as the LOGFONT structure buffer. hMem = GlobalAlloc(GMEM_MOVEABLE Or GMEM_ZEROINIT, Len(lfont)) pMem = GlobalLock(hMem) ' lock and get pointer CopyMemory ByVal pMem, lfont, Len(lfont) ' copy structure's contents into block ' Initialize dialog box: Screen and printer fonts, point size between 10 and 72. cf.lStructSize = Len(cf) ' size of structure cf.hwndOwner = Form1.hWnd ' window Form1 is opening this dialog box cf.hdc = Printer.hDC ' device context of default printer (using VB's mechanism) cf.lfLogFont = pMem ' pointer to LOGFONT memory block buffer cf.iPointSize = 120 ' 12 point font (in units of 1/10 point) cf.flags = CF_BOTH Or CF_EFFECTS Or CF_FORCEFONTEXIST Or CF_INITTOLOGFONTSTRUCT Or CF_LIMITSIZE cf.rgbColors = RGB(0, 0, 0) ' black cf.lCustData = 0 ' we don't use this here... cf.lpfnHook = 0 ' ...or this... cf.lpTemplateName = "" ' ...or this... cf.hInstance = 0 ' ...or this... cf.lpszStyle = "" ' ...or this cf.nFontType = REGULAR_FONTTYPE ' regular font type i.e. not bold or anything cf.nSizeMin = 10 ' minimum point size cf.nSizeMax = 72 ' maximum point size ' Now, call the function. If successful, copy the LOGFONT structure back into the structure ' and then print out the attributes we mentioned earlier that the user selected. retval = ChooseFont(cf) ' open the dialog box If retval <> 0 Then ' success CopyMemory lfont, ByVal pMem, Len(lfont) ' copy memory back ' Now make the fixed-length string holding the font name into a "normal" string. fontname = Left(lfont.lfFaceName, InStr(lfont.lfFaceName, vbNullChar) - 1) ' Display font name and a few attributes. Debug.Print "FONT NAME: "; fontname Debug.Print "FONT SIZE (points):"; cf.iPointSize / 10 ' in units of 1/10 point! Debug.Print "FONT STYLE(S): "; If lfont.lfWeight >= FW_BOLD Then Debug.Print "Bold "; If lfont.lfItalic <> 0 Then Debug.Print "Italic "; If lfont.lfUnderline <> 0 Then Debug.Print "Underline "; If lfont.lfStrikeOut <> 0 Then Debug.Print "Strikeout"; Debug.Print ' end the line End If ' Deallocate the memory block we created earlier. Note that this must ' be done whether the function succeeded or not. retval = GlobalUnlock(hMem) ' destroy pointer, unlock block retval = GlobalFree(hMem) ' free the allocated memory
C# example source code
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