在 c# 项目中使用 c++ dll

Using a c++ dll within a c# project

本文关键字：c++ dll 项目      更新时间：2023-10-16

我希望有人能帮助我。 我有一个名为 LC4_Comm_Lib.dll 的 DLL 文件，它允许与设备通信，但是我试图在 C# 项目中使用它。老实说，我不知道这是否有效，dll 文件附带一个 h 文件

/*
=======================================================================================================================
INFO
=======================================================================================================================
Title       : LC4_Comm_Lib  - Function that are writen for LC4 
Author      : Slobodan Milosevic
Revision    : 1.0.0.1
Date        : 02.11.2015.
=======================================================================================================================
CHANGE LOG
=======================================================================================================================
1.0.0.0     : Initial Release
1.0.0.1     : Brasil update2
=======================================================================================================================
*/
#pragma once

/// Added to enforce __cdecl calling convetion
#define CALL __cdecl
#ifdef LC4_COMM_LIB_EXPORTS
#define COMMLIB_LC4_API __declspec(dllexport)
#else
#define COMMLIB_LC4_API __declspec(dllimport)
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef struct LC4SystemInformation{
char CalibrationDate[64];
char Calibrationvalidity;
char BSMInumber[64];
char LC4_fw[64];
char PL4_fw[64];
char PL4_checksum[64];
}LC4SystemInformation, *ptrLC4SystemInformation;
/* open usb communication */
long COMMLIB_LC4_API Open_USB_Comm();
/* open wifi communication */
long COMMLIB_LC4_API Open_WiFi_Comm(const char* ipAddress);
/* set encryption key */
long COMMLIB_LC4_API Set_Encryption_Key(const char* key);
/* decrypt encrypted file */
long COMMLIB_LC4_API Decrypt_File(const char* encryptedFilePath, const char* _decryptedFilePath);
/* create list of files */
long COMMLIB_LC4_API Create_Available_File_List(int type, const char* time, const char* listPath);
/* get file from device */
long COMMLIB_LC4_API Get_File(const char* Lc4_Path, const char* pc_Path, bool encFlag);
/* close communication whith LC4 device */
void COMMLIB_LC4_API Close_Comm();
/* power off LC4 device */
long COMMLIB_LC4_API Power_Down();
/* get system information */
long COMMLIB_LC4_API Get_SysInfo(ptrLC4SystemInformation sysInfo);
/* set settings path */
void COMMLIB_LC4_API Set_Settings_Path(const char* errorFilePath);
/* get error code*/
long COMMLIB_LC4_API Get_Error_Code();
/* get error string*/
size_t COMMLIB_LC4_API Get_Error_String(char* errStr);
/* get current file progres - for downloaded file */
size_t COMMLIB_LC4_API Get_File_Progress();
/* get size of file */
size_t COMMLIB_LC4_API Get_File_Size();
/* Serial Number */
int COMMLIB_LC4_API cmd_GetLidarSerialNo(char *);
#ifdef __cplusplus
}
#endif

我已经让通信在一个C++项目中工作，但是我想知道是否有可能让它在我的 c# 项目中工作(在不使用 h 文件的情况下猜测(。我已经尝试了很多使用 DLLImport 的东西，甚至通过引用添加它，也

[DllImport("LC4_Comm_Lib.dll", CallingConvention = CallingConvention.Cdecl)]

我不确定我是否在浪费时间，所以我想我会仔细检查

可以在C# 代码中使用C++ DLL，而无需使用 .h 文件。 首先，您必须执行DLL导入。在这里，我正在创建一个类 MFCdllConnector 来执行该操作。

class MFCdllConnector
{ 
[DllImport( "LC4_Comm_Lib.dll", CallingConvention = CallingConvention.Cdecl ) ]
public static extern <your exporting function> //please find below example
public static extern int  MyExampleExportFunction([MarshalAsAttribute(UnmanagedType.LPStr)]string para1, [MarshalAsAttribute(UnmanagedType.LPStr)] string para2,[MarshalAsAttribute(UnmanagedType.LPWStr)] ref StringBuilder output);
}
//You can call this function like below
int return = MFCdllConnector.MyExampleExportFunction(para1, para2, ref OUTPUT);

希望这会有所帮助

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