Hi All,

I am facing a problem can anyone .

I have a function in DLL
void getString(char *string)
{
strcpy(string, "My String);
printf("In Dll %s", string);
}

I am calling this function in my win32 consol app

char mystr[50];
strcpy(mystr, "Test");
getString(myStr);
printf("in main %s", mystr);

The result I am getting is:
In Dll My String
In Main Test

Why DLL is unable to retutn value? If I use this function in main it
is working fine. DLL not working.
Can anyone please explain?
Thanks
Trupti

On Feb 6, 11:29 am, "Samant.Tru...@gmail.com"
<Samant.Tru...@gmail.com> wrote:
> Hi All,
>
> I am facing a problem can anyone .
>
> I have a function in DLL
> void getString(char *string)
> {
> strcpy(string, "My String);
> printf("In Dll %s", string);
>
> }
>
> I am calling this function in my win32 consol app
>
> char mystr[50];
> strcpy(mystr, "Test");
> getString(myStr);
> printf("in main %s", mystr);
>
> The result I am getting is:
> In Dll My String
> In Main Test
>
> Why DLL is unable to retutn value?

Your DLL (function) is NOT returning a value [void getString(char
*string)], you are attempting to modify the char* pointer.
AFAIR it used to work, try to print out the address of those strings
both in DLL's printf() and main's printf().

> If I use this function in main it
> is working fine. DLL not working.
> Can anyone please explain?
> Thanks
> Trupti

On Feb 6, 11:29 am, "Samant.Tru...@gmail.com"
<Samant.Tru...@gmail.com> wrote:
> Hi All,
>
> I am facing a problem can anyone .
>
> I have a function in DLL
> void getString(char *string)
> {
> strcpy(string, "My String);
> printf("In Dll %s", string);
>
> }
>
> I am calling this function in my win32 consol app
>
> char mystr[50];
> strcpy(mystr, "Test");
> getString(myStr);
> printf("in main %s", mystr);
>
> The result I am getting is:
> In Dll My String
> In Main Test
>
> Why DLL is unable to retutn value? If I use this function in main it
> is working fine. DLL not working.
> Can anyone please explain?
> Thanks
> Trupti

If you want to return a value try
char* getString(char *string){
....
return yourString;
}
P.S. You will have to allocate memory to that string inside your DLL
function...

"Samant.Trupti@gmail.com" <Samant.Trupti@gmail.com> wrote in
news:868e7f92-f997-4ae8-b426-8dcb8a47634a@d4g2000prg.googlegroups.com:

> Hi All,
>
> I am facing a problem can anyone .
>
> I have a function in DLL
> void getString(char *string)
> {
> strcpy(string, "My String);
> printf("In Dll %s", string);
> }
>
> I am calling this function in my win32 consol app
>
> char mystr[50];
> strcpy(mystr, "Test");
> getString(myStr);
> printf("in main %s", mystr);
>
> The result I am getting is:
> In Dll My String
> In Main Test
>
> Why DLL is unable to retutn value? If I use this function in main it
> is working fine. DLL not working.
> Can anyone please explain?
> Thanks
> Trupti
>

I can say that I have done things like that without trouble. Off hand,
I would say to check your compiler options to make sure that your dll is
compiled the same way your console app is. Otherwise, I am left with
the thought that the posted code doesn't match exactly what is in your
actual code. I really think that there is some compiler option that is
different and causing the issue.

joe

On Feb 6, 3:29am, "Samant.Tru...@gmail.com" <Samant.Tru...@gmail.com>
wrote:
> Hi All,
>
> I am facing a problem can anyone .
>
> I have a function in DLL
> void getString(char *string)
> {
> strcpy(string, "My String);
> printf("In Dll %s", string);
>
> }
>
> I am calling this function in my win32 consol app
>
> char mystr[50];
> strcpy(mystr, "Test");
> getString(myStr);

myStr has not been defined

> printf("in main %s", mystr);

mystr is not the same entity as myStr

>
> The result I am getting is:
> In Dll My String
> In Main Test
>
> Why DLL is unable to retutn value? If I use this function in main it
> is working fine. DLL not working.
> Can anyone please explain?

Cut and paste the exact code that you think is a problem.
The above snippets will not compile.
--
Fred Kleinschmidt

Samant.Trupti@gmail.com wrote:

>
> I am calling this function in my win32 consol app
>

> Why DLL is unable to retutn value? If I use this function in main it
> is working fine. DLL not working.
> Can anyone please explain?

I have this problem with MS VC8 and up. That compiler refuses to allow
char * to be returned from a DLL ( although it will return other pointer
values ). This problem does not occur in any other compiler I have, nor
in versions of MSVC below V8.