从C＃调用非托管DLL。拿2

问题描述

我编写了一个ac＃程序，调用一个c + + dll，将命令行参数回应到一个文件。

当使用rundll32命令调用c ++时，它会显示命令行没有问题，但是当它从c＃中调用时，它不会。

来尝试解决我的问题，但是我已经修改了我的测试环境，我觉得值得一个新的问题。

这是c ++ dll

  #includestdafx.h
 #includestdlib.h
 #include< stdio.h> 
 #include< iostream> 
 #include< fstream> 
使用命名空间std; 
 
 BOOL APIENTRY DllMain（HANDLE hModule，
 DWORD ul_reason_for_call，
 LPVOID lpReserved 
）
 {
 return TRUE; 
} 
 
 externC__declspec（dllexport）int WINAPI CMAKEX（
 HWND hwnd，
 HINSTANCE hinst，
 LPCSTR lpszCommandLine，
 DWORD dwReserved）
 {
 
 ofstream SaveFile（output.txt）; 
 SaveFile<<< lpszCommandLine; 
 SaveFile.close（）; 
 
 return 0; 
} 
  

这是c＃应用程序

 使用系统; 
使用System.Collections.Generic; 
使用System.Text; 
使用System.Security.Cryptography; 
使用System.Runtime.InteropServices; 
使用System.Net; 
 
命名空间nac 
 {
类程序
 {
 [DllImport（cmakca.dll，SetLastError = true，CharSet = CharSet.Unicode）] 
 static extern bool CMAKEX（IntPtr hwnd，IntPtr hinst，string lpszCmdLine，int nCmdShow）; 
 
 static void Main（string [] args）
 {
 string cmdLine = @/ source_filename proxy-1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN /配置文件C：\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp; 
 const int SW_SHOWNORMAL = 1; 
 CMAKEX（IntPtr.Zero，IntPtr.Zero，cmdLine，SW_SHOWNORMAL）.ToString（）; 
} 
} 
} 
  

rundll32命令的输出是

  rundll32 cmakex.dll，CMAKEX / source_filename proxy-1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN /配置文件C：\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp
 
 / source_filename proxy-1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN /配置文件C：\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp
  

然而，运行c＃应用程序时的输出是

  / 
  

解决方案

code> LPCSTR 不是unicode，是吗？只要使用ANSI，你应该很好： CharSet = CharSet.Ansi

I have written a c# program that calls a c++ dll that echoes the commandline args to a file

When the c++ is called using the rundll32 command it displays the commandline args no problem, however when it is called from within the c# it doesnt.

I asked this question to try and solve my problem, but I have modified it my test environment and I think it is worth asking a new question.

Here is the c++ dll

#include "stdafx.h"
#include "stdlib.h"
#include <stdio.h>
#include <iostream>
#include <fstream>
using namespace std;

BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    return TRUE;
}

extern "C" __declspec(dllexport) int WINAPI CMAKEX(
    HWND hwnd,
    HINSTANCE hinst,
    LPCSTR lpszCommandLine,
    DWORD dwReserved)
{

    ofstream SaveFile("output.txt");
    SaveFile << lpszCommandLine;
    SaveFile.close();

    return 0;
}

Here is the c# app

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Net;

namespace nac
{
    class Program
    {
        [DllImport("cmakca.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        static extern bool CMAKEX(IntPtr hwnd, IntPtr hinst, string lpszCmdLine, int nCmdShow);

        static void Main(string[] args)
        {
            string cmdLine = @"/source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp""";
            const int SW_SHOWNORMAL = 1;
            CMAKEX(IntPtr.Zero, IntPtr.Zero, cmdLine, SW_SHOWNORMAL).ToString();
        }
    }
}

The output from the rundll32 command is

rundll32 cmakex.dll,CMAKEX /source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp"

/source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp"

however the output when the c# app runs is

/

解决方案

LPCSTR is not unicode, is it? Just use ANSI and you should be fine: CharSet = CharSet.Ansi

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