[win32 dll]runtime error: 0xC0000005: Access violation

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all compiled fine but after run, the error occurred 100%
in visual studio 2008 but vc6.
How can to modify it to pass runtime?
What I want is that to run fine only with *.exe and *.dll
Thank you

//test_dll.cpp
#include <windows.h>
#include <stdio.h>
typedef int (*PFUN)(int);
void main()
{
HMODULE hModule = ::LoadLibrary(L"DllTest.dll");
PFUN newfun = (PFUN)::GetProcAddress(hModule,"fun");
int i = newfun(2);
printf("The result is %d",i);
::FreeLibrary(hModule);
}
/***************************************/
//win32_dll1.h
extern "C" __declspec(dllexport) int fun(int i)
/**************************************/
//win32_dll1.def
EXPORTS
fun
/**************************************/
//win32_dll1.cpp
#include "win32_dll1.h"
int fun(int i)
{
return i*i;
}

Posted 29-Oct-10 3:38am

waertf.chen

Updated 29-Oct-10 3:45am

v2

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waertf.chen 29-Oct-10 11:10am

thank you Nishant help me to resolve it

2 solutions

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Nish Nishant · Answer 1 · 2010-10-29T04:27:00

Solution 1

You are not checking for errors. You need to check and see that LoadLibrary succeeded, GetProcAddress succeeded etc.

Posted 29-Oct-10 4:27am

Nish Nishant

waertf.chen · Answer 2 · 2010-10-29T05:15:00

//test_dll.cpp
#include <windows.h>
#include <stdio.h>
typedef int (__cdecl *MYPROC)(int);

void main()
{
HMODULE  hmoudLib = LoadLibrary(TEXT("win32_dll1.dll"));
MYPROC ProcAdd  = (MYPROC) GetProcAddress(hmoudLib, "fun");
int i =ProcAdd(2);
printf("The result is %d",i); //The result is 4
::FreeLibrary(hmoudLib);
}
/***************************************/
//win32_dll1.h
extern "C" __declspec(dllexport) int fun(int i)
/**************************************/
//win32_dll1.def
EXPORTS
fun
/**************************************/
//win32_dll1.cpp
#include "win32_dll1.h"
int fun(int i)
{
return i*i;
}