调用从C＃非托管的DLL。取2

问题描述

我写了调用一个C ++ DLL呼应命令行args设置为一个文件

在C ++的使用RUNDLL32命令调用它显示的命令行C＃程序ARGS没有问题，但是当它被从C＃它不中调用。

的，试图解决我的问题，但我已经修改了它我的测试环境，我认为这是值得一问的新问题。

下面是C ++ DLL

 的#includestdafx.h中
 ＃包括stdlib.h中
&＃包括LT; stdio.h中> 
&＃包括LT; iostream的> 
&＃包括LT; fstream的> 
使用命名空间std; 
 
 BOOL APIENTRY的DllMain（HANDLE HMODULE，
 DWORD ul_reason_for_call，
 LPVOID lpReserved 
）
 {
返回TRUE; 
} 
 
的externC__declspec（dllexport）的INT WINAPI CMAKEX（
 HWND HWND，
 HINSTANCE HINST，
 LPCSTR lpszCommandLine，
 DWORD dwReserved）
 {
 
的ofstream SAVEFILE（output.txt的）; 
 SAVEFILE<< lpszCommandLine; 
 SaveFile.close（）; 
 
返回0; 
} 
  

下面是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 
 {
类节目
 {
函数[DllImport（cmakca.dll，SetLastError = true时，字符集= CharSet.Unicode） 
静态外部布尔CMAKEX（IntPtr的HWND，IntPtr的HINST，串lpszCmdLine，诠释的nCmdShow）; 
 
静态无效的主要（字串[] args）
 {
串CMDLINE = @/ source_filename代理的1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN /配置文件C：\Documents和Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp 
 const int的SW_SHOWNORMAL = 1; 
 CMAKEX（IntPtr.Zero，IntPtr.Zero，CMDLINE，SW_SHOWNORMAL）的ToString（）; 
} 
} 
} 
  

从RUNDLL32命令的输出是

  RUNDLL32 cmakex.dll，CMAKEX / source_filename代理的1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN /配置文件C：\Documents和Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp
 
 / source_filename代理的1.txt / backup_filename proxy.bak / DialRasEntry NULL / TunnelRasEntry DSLVPN / profile文件C：\Documents和Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp
  

然而，当C＃应用程序运行输出

  / 
  

解决方案

LPCSTR 不是Unicode，是吗？只需使用ANSI，你应该罚款：字符集= 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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