DllImport in C #

Question

How do I access C ++ DLL functions in C #

Here are the prototypes from the DLL:

NOMANGLE int CCONV SSPSendCommand (SSP_COMMAND * cmd, SSP_COMMAND_INFO * sspInfo); NOMANGLE int CCONV OpenSSPComPort (SSP_COMMAND * cmd); NOMANGLE int CCONV OpenSSPComPort2 (SSP_COMMAND * cmd); NOMANGLE int CCONV OpenSSPComPortUSB (SSP_COMMAND * cmd); NOMANGLE int CCONV CloseSSPComPort (void); NOMANGLE int CCONV CloseSSPComPort2 (void); NOMANGLE int CCONV CloseSSPComPortUSB (void); NOMANGLE int CCONV DownloadFileToTarget (char * szFilename, int cPort, unsigned char sspAddress); NOMANGLE long CCONV GetRamDownloadStatus (RAM_UPDATE_STATUS * rmData); NOMANGLE int CCONV SetPortCloseOption (unsigned int md); NOMANGLE int CCONV OpenCCTComPort (int PortNumber); NOMANGLE int CCONV CloseCCTComPort (void); NOMANGLE int CCONV CCTSendPacket (unsigned char * pkt, unsigned char * length); 

In C #, I'm trying to do this:

 [DllImport ("ITLSSPProc.dll")] private extern static IntPtr SSP_COMMAND (); [DllImport ("ITLSSPProc.dll")] private static extern int OpenSSPComPort (SSP_COMMAND smd); 

But that gives me an error. What am I doing wrong? thanks in advance

Answer 1

At least one SSP_COMMAND error SSP_COMMAND not a function. This is a type. [DllImport] imports only functions. Either treat it as an opaque IntPtr , or create an appropriate struct its representation.

Using it as an opaque IntPtr :

 [DllImport ("ITLSSPProc.dll")] private static extern int OpenSSPComPort (IntPtr smd); 

To use a structure, see Passing Structures from MSDN and the definition of struct SSP_COMMAND in C #. (This link contains everything you need to get started, including related samples).

Happy coding.

Answer 2

try this:

 public unsafe struct SSP_FULL_KEY { System.Int64 FixedKey; System.Int64 EncryptKey; public SSP_FULL_KEY(System.Int64 fix, System.Int64 encr) { FixedKey = fix; EncryptKey = encr; } } public unsafe struct SSP_COMMAND { //string PortNumber; SSP_FULL_KEY key; System.Int32 BaudRate; // baud rate of the packet System.Int32 Timeout; // how long in ms to wait for a reply from the slave char PortNumber; // the serial com port number of the host char SSPAddress; // the SSP address of the slave char RetryLevel; // how many retries to the slave for non-response char EncryptionStatus; // is this an encrypted command 0 - No, 1 - Yes char CommandDataLength; // Number of bytes in the command fixed char CommandData[255]; // Array containing the command bytes char ResponseStatus; // Response Status (PORT_STATUS enum) char ResponseDataLength; // how many bytes in the response fixed char ResponseData[255]; // an array of response data char IgnoreError; // flag to suppress error box (0 - display,1- suppress) public SSP_COMMAND(Byte comport) { BaudRate = 9600; Timeout = 500; PortNumber = (char)comport; RetryLevel = '5'; IgnoreError = '0'; EncryptionStatus = '0'; ResponseStatus = '0'; ResponseDataLength = '0'; SSPAddress = '0'; CommandDataLength = '0'; key = new SSP_FULL_KEY(0123456701234567, 0123456701234567); } } class Program { //NOMANGLE int CCONV OpenSSPComPort (SSP_COMMAND * cmd); [DllImport("ITLSSPProc.dll")] private static extern int OpenSSPComPort(ref SSP_COMMAND cmd); //NOMANGLE int CCONV CloseSSPComPort (void); [DllImport("ITLSSPProc.dll")] private static extern int CloseSSPComPort(); static void Main(string[] args) { SSP_COMMAND cmd = new SSP_COMMAND(3); /* IntPtr.BaudRate = 9600; IntPtr.PortName = "COM0"; IntPtr.Parity = Parity.None; IntPtr.StopBits = StopBits.One; */ Console.WriteLine("open {0}", OpenSSPComPort(ref cmd)); Console.WriteLine("close {0}", CloseSSPComPort()); Console.ReadKey(); } }