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Text File | 1998-11-13 | 16.4 KB | 359 lines

<HTML> <HEAD><TITLE> ChooseFont Demo</TITLE> </HEAD> <BODY bgColor=#ffffff text=#000000> <H1>Font Dialog Box</H1> The Font dialog box lets the user choose attributes for a logical font, such as typeface name, style (bold, italic, or regular), point size, effects (underline, strikeout, and text color), and a script (or character set). You create and display a Font dialog box by initializing a CHOOSEFONT structure and passing the structure to the ChooseFont function. The following illustration shows a typical Font dialog box. <IMG alt="" border=0 src="cfdemo.bmp"> If the user clicks the OK button, ChooseFont returns TRUE and sets the members of the LOGFONT structure pointed to by the lpLogFont member of the CHOOSEFONT structure. You can use the LOGFONT structure with the CreateFontIndirect function to create a logical font. ChooseFont also sets other CHOOSEFONT members to indicate the user's selections. If the user cancels the Font dialog box or an error occurs, ChooseFont returns FALSE and the contents of the LOGFONT structure are not defined. You can determine the cause of an error by using the CommDlgExtendedError function to retrieve the extended error value. <H1>CHOOSEFONT</H1> The CHOOSEFONT structure contains information that the ChooseFont function uses to initialize the Font common dialog box. After the user closes the dialog box, the system returns information about the user's selection in this structure. <PRE><CODE>typedef struct { // cf DWORD lStructSize; HWND hwndOwner; HDC hDC; LPLOGFONT lpLogFont; INT iPointSize; DWORD Flags; DWORD rgbColors; LPARAM lCustData; LPCFHOOKPROC lpfnHook; LPCTSTR lpTemplateName; HINSTANCE hInstance; LPTSTR lpszStyle; WORD nFontType; WORD ___MISSING_ALIGNMENT__; INT nSizeMin; INT nSizeMax; } CHOOSEFONT; </CODE></PRE> <H4>Members</H4> <DL> <DT>lStructSize <DD>Specifies the length, in bytes, of the structure. <DT>hwndOwner <DD>Identifies the window that owns the dialog box. This member can be any valid window handle, or it can be NULL if the dialog box has no owner. <DT>hDC <DD>Identifies the device context (or information context) of the printer whose fonts will be listed in the dialog box. This member is used only if the Flags member specifies the CF_PRINTERFONTS or CF_BOTH flag; otherwise, this member is ignored. <DT>lpLogFont <DD>Pointer to a LOGFONT</A> structure. If you set the CF_INITTOLOGFONTSTRUCT flag in the Flags member and initialize the LOGFONT members, the ChooseFont function initializes the dialog box with a font that is the closest possible match. If the user clicks the OK button, ChooseFont sets the members of the LOGFONT structure based on the user's selections. <DT>iPointSize <DD>Specifies the size of the selected font, in units of 1/10 of a point. The ChooseFont function sets this value after the user closes the dialog box. <DT>Flags <DD>A set of bit flags that you can use to initialize the Font common dialog box. When the dialog box returns, it sets these flags to indicate the user's input. This member can be a combination of the following flags: <TABLE cellPadding=0 cellSpacing=0 cols=2> <TR vAlign=top> <TH align=left width=49%>Flag</TH> <TH align=left width=51%>Meaning</TH></TR> <TR vAlign=top> <TD width=49%>CF_APPLY</TD> <TD width=51%>Causes the dialog box to display the Apply button. You should provide a hook procedure to process WM_COMMAND messages for the Apply button. The hook procedure can send the WM_CHOOSEFONT_GETLOGFONT message to the dialog box to retrieve the address of the LOGFONT</A> structure that contains the current selections for the font. </TD></TR> <TR vAlign=top> <TD width=49%>CF_ANSIONLY</TD> <TD width=51%>This flag is obsolete. To limit font selections to all scripts except those that use the OEM or Symbol character sets, use CF_SCRIPTSONLY. To get the Windows 3.1 CF_ANSIONLY behavior, use CF_SELECTSCRIPT and specify ANSI_CHARSET in the lfCharSet member of the LOGFONT structure pointed to by lpLogFont.</TD></TR> <TR vAlign=top> <TD width=49%>CF_BOTH</TD> <TD width=51%>Causes the dialog box to list the available printer and screen fonts. The hDC member identifies the device context (or information context) associated with the printer. This flag is a combination of the CF_SCREENFONTS and CF_PRINTERFONTS flags.</TD></TR> <TR vAlign=top> <TD width=49%>CF_TTONLY</TD> <TD width=51%>Specifies that ChooseFont should only enumerate and allow the selection of TrueType fonts.</TD></TR> <TR vAlign=top> <TD width=49%>CF_EFFECTS</TD> <TD width=51%>Causes the dialog box to display the controls that allow the user to specify strikeout, underline, and text color options. If this flag is set, you can use the rgbColors member to specify the initial text color. You can use the lfStrikeOut and lfUnderline members of the LOGFONT structure pointed to by lpLogFont to specify the initial settings of the strikeout and underline check boxes. ChooseFont can use these members to return the user's selections.</TD></TR> <TR vAlign=top> <TD width=49%>CF_ENABLEHOOK</TD> <TD width=51%>Enables the hook procedure specified in the lpfnHook member of this structure.</TD></TR> <TR vAlign=top> <TD width=49%>CF_ENABLETEMPLATE</TD> <TD width=51%>Indicates that the hInstance and lpTemplateName members specify a dialog box template to use in place of the default template.</TD></TR> <TR vAlign=top> <TD width=49%>CF_ENABLETEMPLATEHANDLE</TD> <TD width=51%>Indicates that the hInstance member identifies a data block that contains a preloaded dialog box template. The system ignores the lpTemplateName member if this flag is specified.</TD></TR> <TR vAlign=top> <TD width=49%>CF_FIXEDPITCHONLY</TD> <TD width=51%>Specifies that ChooseFont should select only fixed-pitch fonts.</TD></TR> <TR vAlign=top> <TD width=49%>CF_FORCEFONTEXIST</TD> <TD width=51%>Specifies that ChooseFont should indicate an error condition if the user attempts to select a font or style that does not exist.</TD></TR> <TR vAlign=top> <TD width=49%>CF_INITTOLOGFONTSTRUCT</TD> <TD width=51%>Specifies that ChooseFont should use the LOGFONT structure pointed to by the lpLogFont member to initialize the dialog box controls.</TD></TR> <TR vAlign=top> <TD width=49%>CF_LIMITSIZE</TD> <TD width=51%>Specifies that ChooseFont should select only font sizes within the range specified by the nSizeMin and nSizeMax members.</TD></TR> <TR vAlign=top> <TD width=49%>CF_NOOEMFONTS</TD> <TD width=51%>Same as the CF_NOVECTORFONTS flag.</TD></TR> <TR vAlign=top> <TD width=49%>CF_NOFACESEL</TD> <TD width=51%>When using a LOGFONT structure to initialize the dialog box controls, use this flag to selectively prevent the dialog box from displaying an initial selection for the font name combo box. This is useful when there is no single font name that applies to the text selection. </TD></TR> <TR vAlign=top> <TD width=49%>CF_NOSCRIPTSEL</TD> <TD width=51%>Disables the Script combo box. When this flag is set, the lfCharSet member of the LOGFONT structure is set to DEFAULT_CHARSET when ChooseFont returns. This flag is used only to initialize the dialog box.</TD></TR> <TR vAlign=top> <TD width=49%>CF_NOSTYLESEL</TD> <TD width=51%>When using a LOGFONT structure to initialize the dialog box controls, use this flag to selectively prevent the dialog box from displaying an initial selection for the font style combo box. This is useful when there is no single font style that applies to the text selection. </TD></TR> <TR vAlign=top> <TD width=49%>CF_NOSIZESEL</TD> <TD width=51%>When using aLOGFONT structure to initialize the dialog box controls, use this flag to selectively prevent the dialog box from displaying an initial selection for the font size combo box. This is useful when there is no single font size that applies to the text selection. </TD></TR> <TR vAlign=top> <TD width=49%>CF_NOSIMULATIONS</TD> <TD width=51%>Specifies that ChooseFont should not allow graphics device interface (GDI) font simulations.</TD></TR> <TR vAlign=top> <TD width=49%>CF_NOVECTORFONTS</TD> <TD width=51%>Specifies that ChooseFont should not allow vector font selections.</TD></TR> <TR vAlign=top> <TD width=49%>CF_NOVERTFONTS</TD> <TD width=51%>Causes the Font dialog box to list only horizontally oriented fonts.</TD></TR> <TR vAlign=top> <TD width=49%>CF_PRINTERFONTS</TD> <TD width=51%>Causes the dialog box to list only the fonts supported by the printer associated with the device context (or information context) identified by the hDC member.</TD></TR> <TR vAlign=top> <TD width=49%>CF_SCALABLEONLY</TD> <TD width=51%>Specifies that ChooseFont should allow only the selection of scalable fonts. (Scalable fonts include vector fonts, scalable printer fonts, TrueType fonts, and fonts scaled by other technologies.)</TD></TR> <TR vAlign=top> <TD width=49%>CF_SCREENFONTS</TD> <TD width=51%>Causes the dialog box to list only the screen fonts supported by the system.</TD></TR> <TR vAlign=top> <TD width=49%>CF_SCRIPTSONLY</TD> <TD width=51%>Specifies that ChooseFont should allow selection of fonts for all non-OEM and Symbol character sets, as well as the ANSI character set. This supersedes the CF_ANSIONLY value.</TD></TR> <TR vAlign=top> <TD width=49%>CF_SELECTSCRIPT</TD> <TD width=51%>When specified on input, only fonts with the character set identified in the lfCharSet member of the LOGFONT structure are displayed. The user will not be allowed to change the character set specified in the Scripts combo box.</TD></TR> <TR vAlign=top> <TD width=49%>CF_SHOWHELP</TD> <TD width=51%>Causes the dialog box to display the Help button. The hwndOwner member must specify the window to receive the HELPMSGSTRING registered messages that the dialog box sends when the user clicks the Help button.</TD></TR> <TR vAlign=top> <TD width=49%>CF_USESTYLE</TD> <TD width=51%>Specifies that the lpszStyle member points to a buffer that contains style data that ChooseFont should use to initialize the Font Style combo box. When the user closes the dialog box, ChooseFont copies style data for the user's selection to this buffer.</TD></TR> <TR vAlign=top> <TD width=49%>CF_WYSIWYG</TD> <TD width=51%>Specifies that ChooseFont should allow only the selection of fonts available on both the printer and the display. If this flag is specified, the CF_BOTH and CF_SCALABLEONLY flags should also be specified.</TD></TR> </TBODY> </TABLE> <DT>rgbColors <DD>If the CF_EFFECTS flag is set, rgbColors specifies the initial text color. When ChooseFont returns successfully, this member contains the RGB value of the text color the user selected. <DT>lCustData <DD>Specifies application-defined data that the system passes to the hook procedure identified by the lpfnHook member. When the system sends the WM_INITDIALOG message to the hook procedure, the message's lParam parameter is a pointer to the CHOOSEFONT structure specified when the dialog was created. The hook procedure can use this pointer to get the lCustData value. <DT>lpfnHook <DD>Pointer to a CFHookProc hook procedure that can process messages intended for the dialog box. This member is ignored unless the CF_ENABLEHOOK flag is set in the Flags member. <DT>lpTemplateName <DD>Pointer to a null-terminated string that names the dialog box template resource in the module identified by the hInstance member. This template is substituted for the standard dialog box template. For numbered dialog box resources, lpTemplateName can be a value returned by the MAKEINTRESOURCE macro. This member is ignored unless the CF_ENABLETEMPLATE flag is set in the Flags member. <DT>hInstance <DD>If the CF_ENABLETEMPLATEHANDLE flag is set in the Flags member, hInstance is the handle of a memory object containing a dialog box template. If the CF_ENABLETEMPLATE flag is set, hInstance identifies a module that contains a dialog box template named by the lpTemplateName member. If neither CF_ENABLETEMPLATEHANDLE nor CF_ENABLETEMPLATE is set, this member is ignored. <DT>lpszStyle <DD>Pointer to a buffer that contains style data. If the CF_USESTYLE flag is specified, ChooseFont uses the data in this buffer to initialize the font style combo box. When the user closes the dialog box, ChooseFont copies the string in the font style combo box into this buffer. <DT>nFontType <DD>Specifies the type of the selected font when ChooseFont returns. This member can be a combination of the following values: <TABLE cellPadding=0 cellSpacing=0 cols=2> <TR vAlign=top> <TD width=39%>Value</TD> <TH align=left width=61%>Meaning</TH></TR> <TR vAlign=top> <TD width=39%>BOLD_FONTTYPE</TD> <TD width=61%>The font weight is bold. This information is duplicated in the lfWeight member of the LOGFONT structure and is equivalent to FW_BOLD.</TD></TR> <TR vAlign=top> <TD width=39%>ITALIC_FONTTYPE</TD> <TD width=61%>The italic font attribute is set. This information is duplicated in the lfItalic member of the LOGFONT structure.</TD></TR> <TR vAlign=top> <TD width=39%>PRINTER_FONTTYPE</TD> <TD width=61%>The font is a printer font.</TD></TR> <TR vAlign=top> <TD width=39%>REGULAR_FONTTYPE</TD> <TD width=61%>The font weight is normal. This information is duplicated in the lfWeight member of the LOGFONT structure and is equivalent to FW_REGULAR.</TD></TR> <TR vAlign=top> <TD width=39%>SCREEN_FONTTYPE</TD> <TD width=61%>The font is a screen font.</TD></TR> <TR vAlign=top> <TD width=39%>SIMULATED_FONTTYPE</TD> <TD width=61%>The font is simulated by the graphics device interface (GDI).</TD></TR> </TBODY> </TABLE> <DT>nSizeMin <DD>Specifies the minimum point size a user can select. ChooseFont recognizes this member only if the CF_LIMITSIZE flag is specified. <DT>nSizeMax <DD>Specifies the maximum point size a user can select. ChooseFont recognizes this member only if the CF_LIMITSIZE flag is specified. </DD></DL> </BODY></HTML>