wxWidgets and string & iostream

[Teo Fonrouge]

On Tue, 2006-09-05 at 13:32 +0200, Fibre Optic wrote:
> Teo Fonrouge wrote:
> > 
> > Yes, I used to have lots of cout's to make tracelogs. Now I use the
> > wxWidgets wxLog* classes, are more powerfull & portable to do program
> > tracelogs.
> > 
> > Have you tried to use a debug utility to do a trace ?.
> > Is your cout iostream a valid one ? ( maybe a full or invalid device is
> > causing the seg fault).
> > 
> > By the way :), what platform & libs versions are you using ?, could be
> > useful to know your current environment settings.
> > 
> >> Regards,
> >> Fibre Optic
> >
> > best regards 
> > Teo Fonrouge
> 
> platform: win32 + mingw port of GCC
> wxWidgets lib: i have compiled/linked the library from sources of CVS 
> repository
> 
> the code is as follows:
> 
> #include <wx/wx.h>
> #include <wx/regex.h>
> #include <stdio.h>
> #include <iostream>
> #include <string>
> 
> int main(int argc, int arg[])
> {
>      char regex[255];
>      wxString cookieField = 
> wxT("Njky=gg6435345b at APC216@172.16.1.15 at D34fD$F$F$F");
> 
>      std::cout << "cookieField: " << cookieField.mb_str() << std::endl;
> 
>      wxString userID;
>      char *p;
> 
>      printf("Enter cookie RegEx and press enter: ");
>      fgets(regex, sizeof(regex), stdin);
> 
>      //now remove \n
>      if ((p = strchr(regex, '\n')) != NULL);
>      *p = '\0';
> 
>      wxRegEx cookieRegEx(wxT(regex));

Just a little observation, the above sentence wont't compile in a
wxWidgets UNICODE version libs because the wrong use of the wxT(...)
macro.

> 
>      if (cookieRegEx.Matches(cookieField)) {
>       userID = cookieRegEx.GetMatch(cookieField, 1);
>       printf("User ID: %s\n", userID.c_str());
>      }
> }
> 
> and here is stack trace:
> 
> wxRegEx-Test.exe caused an Access Violation at location 7c918fea in 
> module ntdll.dll Writing to location 00000010.
> 
> Registers:
> eax=00000000 ebx=00000000 ecx=00000000 edx=73dae7b0 esi=73dae7b0 
> edi=00000000
> eip=7c918fea esp=0023fc1c ebp=0023fc90 iopl=0         nv up ei pl nz na 
> pe nc
> cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000 
> efl=00000202
> 
> Call stack:
> 7C918FEA  ntdll.dll:7C918FEA  RtlpWaitForCriticalSection
> 7C90104B  ntdll.dll:7C90104B  RtlEnterCriticalSection
> 77C40E8B  msvcrt.dll:77C40E8B  fputc
> 005BB47F  wxRegEx-Test.exe:005BB47F  _GLOBAL__D_main  wxRegEx-Test.cpp:32
> 	...
> 	}
> 	
> 	...
> 
> 005D4F8C  wxRegEx-Test.exe:005D4F8C  _GLOBAL__D_main  wxRegEx-Test.cpp:32
> 	...
> 	}
> 	
> 	...
> 
> 005E60F2  wxRegEx-Test.exe:005E60F2  _GLOBAL__D_main  wxRegEx-Test.cpp:32
> 	...
> 	}
> 	
> 	...
> 
> 004013BA  wxRegEx-Test.exe:004013BA  main  wxRegEx-Test.cpp:17
> 	...
> 	    char *p;
> 	
>  >	    printf("Enter cookie RegEx and press enter: ");
> 	    fgets(regex, sizeof(regex), stdin);
> 	
> 	...
> 
> 00401237  wxRegEx-Test.exe:00401237
> 00401288  wxRegEx-Test.exe:00401288
> 7C816FD7  kernel32.dll:7C816FD7  RegisterWaitForInputIdle
> 
> 
> If I have overlooked something let me know.

Unfortunately I had not experience with mingw :(, however your sample
compiles and runs ok in my Linux FC5 environment.

Maybe someone used to mingw can give some light on this problem.


> 
> Regards,
> Fibre Optic
> 

best regards

Teo Fonrouge