Getting Access Violation (Segmentation Fault)

This is a discussion on Getting Access Violation (Segmentation Fault) within the C++ Programming forums, part of the General Programming Boards category; Hi, I have written a program using Dev C++. The program needs to call on functions from a .dll to ...

  1. #1
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    Getting Access Violation (Segmentation Fault)

    Hi,

    I have written a program using Dev C++. The program needs to call on functions from a .dll to run, so I have loaded the corresponding .lib into the project and all of the headers and the .dll is in the same directory as the .cpp file I have created.

    When I go to run the program, it executes as expected until it comes to one of the functions I call from the .dll. At this point the program crashes and asks would I like to send the error of to microsoft. The usual thing.

    I ran the debugger in Dev and it stepped through the program until it reached one of the functions. At this point the following was displayed.

    An Access Violation (Segmentation Fault) raised in your program.

    A friend suggested that the problem could be because the .dll was created with Microsoft Visual Studio and is not compatible with mingw.

    Does anybody know if this is true and if so, any suggestions on what to do?

    Regards

    Brownie

    P.S. The following is a segment of the code. The error is caused when the program tries to execute
    ETGetLinkStatus()
    or
    Code:
    ETSocketLink(ipaddr, 16385)
    Code:
    #include <cstdlib>
    #include <iostream>
    #include <stdio.h>
    #include <memory.h>
    #include "et1000.h"
    
    using namespace std;
    
    int main ()
    {
        int iMachine;
        int iRet;
        int iRetVal;
        char ipaddr[16];
        
        cout << "1" << endl;
        
        iRetVal = ETGetLinkStatus();
        if (iRetVal < 1)
        {
                    cout << "Not Linked" << endl;
        } else {
                    cout << "Linked" << endl;
                    }
            
        cout << "2" << endl;
        
        // prompt for IP and link to chassis
    	printf("Enter IP address of SmartBits chassis ==> ");
    	scanf("%s",ipaddr);
    	printf("Linking on %s \n", ipaddr);
    	
    	cout << "3" << endl;
    	
    // negative return value means command failed
    	iRet=ETSocketLink(ipaddr, 16385);
    	if (iRet < 0)
    	{
    		printf("Error linking to chassis: %d \n",iRet);
    		return iRet;
    	}
        
        cout << "4" << endl;

  2. #2
    Kernel hacker
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    I beleive gcc can generate code that matches any of Visual Studio's calling conventions, so the code being compiled with a different compiler doesn't seem quite right, but I can't really say for sure withtout actually seeing the code in assembler.

    One scenario might be that you should call some form of initialization function before using these functions, but that's just a simple guess.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    Banned master5001's Avatar
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    What matsp said. I have never had any issue with compiling between the two compilers. Sometimes I have found I needed to manually link to the DLL. There are ways of building the proper libraries to connect to a pre-existing DLL too. So chances are you just need to do something of that sort. Since you are not using any C++ code, I think just manually linking to the DLL would work just fine.

    [Edit]I should be less cryptic. You can use LoadLibraryEx()[/Edit]

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