Network programming in VC++ .NET

[chad101]

I’m practicing network programming in C++ .Net. I figured a simple yahoo messenger login application would be a fun way to do this. Every example online is written in Visual Basic. I cannot find anything pertaining to yahoo chat, written in C++.

I found a really good example written in VB .NET which works. The example utilizes a .dll file for encrypting the username and password when logging into yahoo messenger. Below it the Visual Basic example of this function prototype.

#Region "Private Externally Referenced Functions"
Private Declare Function YMSG12_ScriptedMind_Encrypt Lib "YMSG12ENCRYPT.DLL" (ByVal username As String, ByVal password As String, ByVal Seed As String, ByVal result_6 As String, ByVal result_96 As String, ByVal intt As int32) As Boolean
#End Region

This is my attempt at recreating this in C++.Net. I make a bogus call to the “YMSG12_ScriptedMind_Encrypt” function for testing purposes only.

#include "stdafx.h"
#include "Form1.h"
#include "login.h"
#include <windows.h>
#include <string.h>
#include <iostream>

using namespace YAHOOLOGINC;
using namespace std;

typedef bool (WINAPI*cfunc)(std::string username, std::string password,
std::string Seed, std::string result_6,
std::string result_96, int intt);

cfunc YMSG12_ScriptedMind_Encrypt;

[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);

HINSTANCE hMod = LoadLibrary("YMSG12ENCRYPT.DLL");
if(hMod==NULL)
MessageBox::Show("Unable to load dll");

YMSG12_ScriptedMind_Encrypt=(cfunc)GetProcAddress((HMODULE)hMod, "YMSG12_ScriptedMind_Encrypt");
//test call to the dll
bool test = YMSG12_ScriptedMind_Encrypt("hdhd", "dgdf", " ", " ", " ", 7);

// Create the main window and run it
Application::Run(gcnew Form1());
return 0;
}

When I run this code I get this error

An unhandled exception of type 'System.AccessViolationException' occurred in YAHOOLOGINC++.exe

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

I’m not sure if this .dll can be used in a C++ app or if this has something to do with the CheckForIllegalCrossThreadCalls being set to true by defualt in VS 2005

I have attached a copy of this .dll file (YMSG12ENCRYPT.dll) and the VB.NET example.

[Brad Jones]

Attachments were flagged by safety scan, so removed.

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