Calling a DLL from a C prog

Posted on 1997-12-11
Last Modified: 2012-05-04
How to make a call to a Dll in a C program and then create an exe.
Question by:achimala

Expert Comment

ID: 1256631
Could you clarify what exactly you want to do. Do you want to call function in a DLL from exe written in c?

Author Comment

ID: 1256632
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"," " );
}/*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.

Expert Comment

ID: 1256633
What 's your compiler version ?
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Author Comment

ID: 1256634
I am using Microsoft Visual C++ version 1.52 (16-bit).

Accepted Solution

emmons earned 100 total points
ID: 1256635
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.

Author Comment

ID: 1256636
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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