在c＃项目中使用c ++ dll

Question

我希望有人可以帮助我。我有一个名为LC4_Comm_Lib.dll的dll文件，该文件允许与设备进行通信，但是我试图在c＃项目中使用它。老实说，我不知道这是否能正常工作，dll文件带有一个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
我已经可以在C ++项目中进行通信，但是我想知道是否有可能使其在我的C＃项目中工作（猜测而不使用h文件）。我已经尝试使用DLLImport进行很多操作，甚至通过引用将其添加，也]
 [DllImport("LC4_Comm_Lib.dll", CallingConvention = CallingConvention.Cdecl)]
我不确定我是否在浪费时间，所以以为我会仔细检查
    

我希望有人可以帮助我。我有一个名为LC4_Comm_Lib.dll的dll文件，该文件允许与设备进行通信，但是我试图在c＃项目中使用它。老实说，我不知道这是否可以工作...

Answer 1

您可以使用C＃代码使用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MFCdllConnector类来执行该操作。

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);