Compiler error

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4 total messages Started by Terry Wed, 12 Mar 2003 02:12

#17486

Author: Terry
Date: Wed, 12 Mar 2003 02:12

29 lines
1788 bytes

I have been staring at this and i just cannot figure out what
is causing the error.

BOOL WINAPI EnumProcs(PROCENUMPROC lpProc, LPARAM lParam)
{
    //code
}

BOOL CALLBACK ProcessEnumProc(DWORD dw, WORD w16, LPCSTR lpstr, LPARAM
lParam)
{
    // code
}

void __fastcall TForm1::ToolButton1Click(TObject *Sender)
{
    EnumProcs(ProcessEnumProc, (LPARAM)ListView1);  << the error below
[C++ Error] Unit1.cpp(354): E2034 Cannot convert 'int (__stdcall
*)(unsigned long,unsigned short,const char *,long)' to 'int (__stdcall
*)(unsigned long,unsigned short,char *,long)'

[C++ Error] Unit1.cpp(354): E2342 Type mismatch in parameter 'lpProc'
(wanted 'int (__stdcall *)(unsigned long,unsigned short,char *,long)',
got 'int (__stdcall *)(unsigned long,unsigned short,const char
*,long)')
}


Can anyone see a problem here?

Re: Compiler error

#17496

Author: Holy Punk
Date: Tue, 11 Mar 2003 23:34

20 lines
1434 bytes

"Terry" <terry@helloworld.com> wrote in message
news:3e6e976e$1@newsgroups.borland.com...
> I have been staring at this and i just cannot figure out what
> is causing the error.
> BOOL WINAPI EnumProcs(PROCENUMPROC lpProc, LPARAM lParam)
> {
>     //code
> }
>
> BOOL CALLBACK ProcessEnumProc(DWORD dw, WORD w16, LPCSTR lpstr, LPARAM
> lParam)
> {
>     // code
> }

Change LPCSTR to LPSTR. By the way, it's always better to use "char*" or
"const char*" explicitly, then such problem wouldn't appear ;).

Best regards,
Holy Punk.

Re: Compiler error

#17492

Author: Ed Mulroy [TeamB]
Date: Wed, 12 Mar 2003 02:33

43 lines
2296 bytes

The error message hinges on the definition of the typedef PROCENUMPROC but
that definition is not shown in the message.

The error message suggests that it is a declaration of a pointer to a
CALLBACK function taking an argument list whose third argument is a char* or
LPSTR but the function whose name was used as the pointer argument in the
code had a third  argument of const char* or LPCSTR.

.  Ed

> Terry wrote in message
> news:3e6e976e$1@newsgroups.borland.com...
> I have been staring at this and i just cannot figure out what
> is causing the error.
>
> BOOL WINAPI EnumProcs(PROCENUMPROC lpProc,
>  LPARAM lParam)
> {
>     //code
> }
>
> BOOL CALLBACK ProcessEnumProc(DWORD dw,
> WORD w16, LPCSTR lpstr, LPARAM
> lParam)
> {
>     // code
> }
>
> void __fastcall TForm1::ToolButton1Click(TObject *Sender)
> {
>     EnumProcs(ProcessEnumProc, (LPARAM)ListView1);
>  << the error below
> [C++ Error] Unit1.cpp(354): E2034 Cannot convert
> 'int (__stdcall*)(unsigned long, unsigned short, const char *,long)'
> to
> 'int (__stdcall*)(unsigned long, unsigned short, char *,long)'
>
> [C++ Error] Unit1.cpp(354): E2342 Type mismatch in parameter
> 'lpProc' (wanted
> 'int (__stdcall *)(unsigned long,unsigned short,char *,long)',
> got
> 'int (__stdcall *)(unsigned long,unsigned short,const char *,long)')
> }

Re: Compiler error

#17494

Author: Bruce Salzman
Date: Wed, 12 Mar 2003 02:34

10 lines
1261 bytes

> [C++ Error] Unit1.cpp(354): E2342 Type mismatch in parameter 'lpProc'
> (wanted 'int (__stdcall *)(unsigned long,unsigned short,char *,long)',
> got 'int (__stdcall *)(unsigned long,unsigned short,const char
> *,long)')

Apparently, the definition of  PROCENUMPROC expects a char*
as the third parameter, and you are trying to pass a const char*.

HTH,
Bruce

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