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problems with #define STRICT

Posted on 1998-11-04
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Last Modified: 2013-12-03
Hi;

I have been working my way through Charles Petzold's book Programming Windows95 ( using C and the SDK ).

In a program I am building I found it necessary to "#define STRICT" to make the compiler accept an array of windproc pointers.  That worked fine, but code that previously compiled okay doesn't compile now.

The error message I get is:

MainProgram.obj : error LNK2001: unresolved external symbol "struct HFONT__ * __cdecl EzCreateFont(struct HDC__ *,char *,int,int,int,int)" (?EzCreateFont@@YAPAUHFONT__@@PAUHDC__@@PADHHHH@Z)

"Ezfont.h" & "Ezfont.cpp" ( originally named Ezfont.c ) is a file for selecting fonts in Win95 that Charles Petzold included in his book.

Is there a way I can still use "#define STRICT", still use Ezfont, and have everyone place nice?

The code for Ezfont is below:


*----------------------
   EZFONT.H header file
  ----------------------*/

HFONT EzCreateFont (HDC hdc, char * szFaceName, int iDeciPtHeight,
                    int iDeciPtWidth, int iAttributes, BOOL fLogRes) ;

#define EZ_ATTR_BOLD          1
#define EZ_ATTR_ITALIC        2
#define EZ_ATTR_UNDERLINE     4
#define EZ_ATTR_STRIKEOUT     8

/*---------------------------------------
   EZFONT.C -- Easy Font Creation
               (c) Charles Petzold, 1996
  ---------------------------------------*/


#include <windows.h>
#include <string.h>
#include <math.h>
#include "Ezfont.h"

HFONT EzCreateFont (HDC hdc, char * szFaceName, int iDeciPtHeight,
                    int iDeciPtWidth, int iAttributes, BOOL fLogRes)
     {
     FLOAT      cxDpi, cyDpi ;
     HFONT      hFont ;
     LOGFONT    lf ;
     POINT      pt ;
     TEXTMETRIC tm ;

     SaveDC (hdc) ;

     SetGraphicsMode (hdc, GM_ADVANCED) ;
     ModifyWorldTransform (hdc, NULL, MWT_IDENTITY) ;
     SetViewportOrgEx (hdc, 0, 0, NULL) ;
     SetWindowOrgEx   (hdc, 0, 0, NULL) ;

     if (fLogRes)
          {
          cxDpi = (FLOAT) GetDeviceCaps (hdc, LOGPIXELSX) ;
          cyDpi = (FLOAT) GetDeviceCaps (hdc, LOGPIXELSY) ;
          }
     else
          {
          cxDpi = (FLOAT) (25.4 * GetDeviceCaps (hdc, HORZRES) /
                                  GetDeviceCaps (hdc, HORZSIZE)) ;

          cyDpi = (FLOAT) (25.4 * GetDeviceCaps (hdc, VERTRES) /
                                  GetDeviceCaps (hdc, VERTSIZE)) ;
          }

     pt.x = (int) (iDeciPtWidth  * cxDpi / 72) ;
     pt.y = (int) (iDeciPtHeight * cyDpi / 72) ;

     DPtoLP (hdc, &pt, 1) ;

     lf.lfHeight         = - (int) (fabs (pt.y) / 10.0 + 0.5) ;
     lf.lfWidth          = 0 ;
     lf.lfEscapement     = 0 ;
     lf.lfOrientation    = 0 ;
     lf.lfWeight         = iAttributes & EZ_ATTR_BOLD      ? 700 : 0 ;
     lf.lfItalic         = iAttributes & EZ_ATTR_ITALIC    ?   1 : 0 ;
     lf.lfUnderline      = iAttributes & EZ_ATTR_UNDERLINE ?   1 : 0 ;
     lf.lfStrikeOut      = iAttributes & EZ_ATTR_STRIKEOUT ?   1 : 0 ;
     lf.lfCharSet        = 0 ;
     lf.lfOutPrecision   = 0 ;
     lf.lfClipPrecision  = 0 ;
     lf.lfQuality        = 0 ;
     lf.lfPitchAndFamily = 0 ;

     strcpy (lf.lfFaceName, szFaceName) ;

     hFont = CreateFontIndirect (&lf) ;

     if (iDeciPtWidth != 0)
          {
          hFont = (HFONT) SelectObject (hdc, hFont) ;

          GetTextMetrics (hdc, &tm) ;

          DeleteObject (SelectObject (hdc, hFont)) ;

          lf.lfWidth = (int) (tm.tmAveCharWidth *
                              fabs (pt.x) / fabs (pt.y) + 0.5) ;

          hFont = CreateFontIndirect (&lf) ;
          }

     RestoreDC (hdc, -1) ;

     return hFont ;
     }
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Question by:anatta18
1 Comment
 
LVL 86

Accepted Solution

by:
jkr earned 60 total points
ID: 1415740
Yes. Simply use

extern "C"
HFONT EzCreateFont (HDC hdc, char * szFaceName, int iDeciPtHeight,
                    int iDeciPtWidth, int iAttributes, BOOL fLogRes) ;

as the function prototype. Otherwise, the compiler will geneate C++ mangled names, which someties (as in your case) leads to linker problems.
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