从 C# 中包含 .dll

Question

我有库说 tenslib.h，我已经使用 visual Studio 10 C 将其更改为 tensLibs.dll（我使用了 this）。

我想使用 C# window 表单应用程序打开它。我构建它并成功了。但是当我运行申请的时候，出现了错误：

An unhandled exception of type 'System.DllNotFoundException' occurred in WindowsFormsCSharpApplication3.exe

Additional information: Unable to load DLL 'tensLibs.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

这是我程序的快照

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices; //for export dll


namespace WindowsFormsCSharpApplication3
{
public partial class Form1 : Form
{
    [DllImport("tensLibs.dll", EntryPoint = "tens_init")]
    public static extern int tens_init([MarshalAsAttribute(UnmanagedType.LPStr)]string port);

 private void button2_Click(object sender, EventArgs e)
    {
        if (tens_init("COM8") == 1)
            label2.Text="Com 8 is initiated";
        else
            label2.Text="Com 8 does not exists";
    }
}
}

我已经在文件夹中添加了tensLibs.dll，但错误仍然出现。我已经尝试将 dll 文件的引用添加到项目中，但无法添加。

我使用 depedency walker 程序找到了我的 .dll 的根目录，它需要 Kernel32.dll 和 MSVCR100d.dll 并且我已经添加到我的文件夹，错误仍然存在。

我在 x86 中运行。

这是我的Tens.h来源

#ifndef TENSLIB_H_
#define TENSLIB_H_

#ifdef __cplusplus
 extern "C" {
#endif

int  tens_init( char* port );
void tens_shutdown( void );


int tens_tutor( unsigned char finger );
void tens_shutdown( void );

int tens_settarget( unsigned char id );

int tens_enable( unsigned char supply_on, unsigned char bridge_on );
int tens_power( unsigned char power );
int tens_freq( unsigned char freq );
int tens_control( unsigned char power, unsigned char freq );

int tens_chargerate( unsigned char rate );
int tens_tunepower( unsigned char up );
int tens_writeconfig( void );
int tens_changeid( unsigned char id );

int tens_envs( unsigned char distance );
int tens_envsconf( unsigned char pmin, unsigned char pmax, unsigned char fmin, unsigned char fmax );

int tens_tutor( unsigned char finger );

int tens_garbage( void );


#ifdef __cplusplus
}
#endif

#endif

因为 tens.c 太长了，我只是把 tens_init()

#ifdef __cplusplus
extern "C" {
#endif

#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include "tenslib.h"

#ifdef TENSLIB_CHATTER
#define PRINTF( ... ) printf( __VA_ARGS__ )
#else
    #define PRINTF( ... )
#endif

#define TRUE  1
 #define FALSE 0

#define PACKET_ENABLE      0
#define PACKET_POWER       1
#define PACKET_FREQ        2
#define PACKET_CONTROL     3
#define PACKET_CHARGERATE  4
#define PACKET_TUNEPOWER   5
 #define PACKET_WRITECONFIG 6
#define PACKET_CHANGEID    7
#define PACKET_ENVS        8
#define PACKET_ENVSCONF    9
#define PACKET_TUTOR       10

static HANDLE hnd_serial = INVALID_HANDLE_VALUE;
static unsigned char patch_id = 0;

 int tens_init( char* port )
 {
    DCB conf = { 0 };
conf.DCBlength = sizeof( conf );

if ( hnd_serial != INVALID_HANDLE_VALUE )
    CloseHandle( hnd_serial );

PRINTF( "Opening serial connection.\n" );

hnd_serial = CreateFileA( port, GENERIC_READ | GENERIC_WRITE, 0, 0,
                         OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 );

if ( hnd_serial == INVALID_HANDLE_VALUE ) {
    PRINTF( "Failed to open serial port.\n" );
    return FALSE;
}

if ( !GetCommState( hnd_serial, &conf ) ) {
    PRINTF( "Failed to configure serial port.\n" );
    CloseHandle( hnd_serial );
    hnd_serial = INVALID_HANDLE_VALUE;
    return FALSE;
}

conf.BaudRate = CBR_9600;
conf.ByteSize = 8;
conf.Parity = NOPARITY;
conf.StopBits = ONESTOPBIT;

if ( !SetCommState( hnd_serial, &conf ) ) {
    PRINTF( "Failed to configure serial port.\n" );
    CloseHandle( hnd_serial );
    hnd_serial = INVALID_HANDLE_VALUE;
    return FALSE;   
}

PRINTF( "Connected to %s at 9600/8/N/1.\n", port );
return TRUE;
 }

     void tens_shutdown( void )
 {
if ( hnd_serial != INVALID_HANDLE_VALUE ) {
    PRINTF( "Closing serial connection.\n" );
    CloseHandle( hnd_serial );
    hnd_serial = INVALID_HANDLE_VALUE;
}
 }

谁能告诉我这是什么问题，我该如何解决？

谢谢。

Answer 1

互操作有两个问题。

1.缺少依赖关系

System.DllNotFoundException 异常告诉您找不到您的 DLL 或其依赖项之一。将 DLL 放在与可执行文件相同的目录中。安装 DLL 的任何运行时依赖项，例如 MSVC 运行时。如果目标计算机上没有用于 DLL 的 VS 版本，则可能需要编译 DLL 的发布版本。

2。调用约定不匹配

DLL 导出 cdecl 函数。您导入为 stdcall。 DllImport 属性需要指定正确的调用约定：

[DllImport("tensLibs.dll", CallingConvention = CallingConvention.Cdecl)]

题外话。 C中的布尔测试如下。零是假的，其他都是真的。不要在 C# 代码中测试 == 1。测试!= 0。但是，对于 tens_init 的 return 类型使用 bool 并让封送拆收器为您完成工作会更简单。

从 C# 中包含 .dll

Include .dll from C#

c#

pinvoke

dllimport