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Calling a DLL from a C prog

achimala
achimala asked
on
Medium Priority
241 Views
Last Modified: 2012-05-04
Hi,
How to make a call to a Dll in a C program and then create an exe.
Regards,
AC
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Commented:
Could you clarify what exactly you want to do. Do you want to call function in a DLL from exe written in c?

Author

Commented:
Alex,
Thank you so much for responding. I have the following things: (I)An exe, which calls the functions in anohter DLL: The code is:
#include <stdio.h>  
#include <stdlib.h>
#include <string.h>
#include <rctpub.h>
#include <memory.h>
#include <malloc.h>
#include <windows.h>
#include <profpub.h>
#include <gtipub.h>
#include <actmpub.h>
#include <rctmsg.h>
#include <elogpub.h>
#include <rctxpub.h>
#include <fetixpub.h>

int main ( int argc, char * argv[] )
{
   long lCoreSession   = 0;
   long lSessionFolder = 0;  
   int  iRV            = 0;

iRV = RctXInitializeCORESession(&lCoreSession,
&lSessionFolder,"ApplName","FendId"," " );
return(0);
}/*Works fine: doing what it is supposed to do*/

(II)A dll: the code for which is:
#include <windows.h>
int _export FAR CDECL RctXInitializeCORESession(lCoreSession, lSessionFolder,ApplName, FendId, FendPwd);

(III)What I am trying to do is: Create another exe (of course written in C), wherein I would like to call the DLL that I have created in step II!
(IV)The reason for doing all this is to use these exe's in my Oracle*Forms applications.
Regards,
AC
 

Commented:
What 's your compiler version ?

Author

Commented:
I am using Microsoft Visual C++ version 1.52 (16-bit).
Commented:
If you have written the DLL, then you should also have the LIB file associated with it, right? (if not, then run implib, like:
implib yourlib.lib yourlib.dll)
Then, all that you have to do is to include the LIB file on the link line. Something like:
link yourexe, yourexe.exe, null, libw slibcew yourlib, yourexe.def;

There is a way to do the linking dynamically, by loading the library, and then getting the address of the function that you want to call, but the implicit loading described above would seem like the way to go for you.

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Author

Commented:
OK. I am trying to think back to 1.52.
You will need to change the project parameters.
Or, look in the help search for LINK, and let it tell you how to change the linking paramters.
In the dialog for linking, you will find an edit field for "Additional Libraries" that is where you add the yourlib.lib library entry.
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