Using 3rd party dll with PInvoke

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Hi everybody

I have a 3rd party dll, which I want to use in my app(.net framework, c#4.0). Dll is used to control IR learner hardware component. Below is the header file for the dll.

extern "C" {

/******************** CALLBACKS **********************/
//Callback called when the status of the PIR-1 driver is affected.
typedef void (__stdcall *fStatusCB) ( const char * serial, unsigned char status, const char *message);

//fIrSentCB is called when an IR code was sent. 
typedef void (__stdcall *fIrSentCB) ( const char * serial, unsigned char status);

//fIrReceivedCB is called when an IR code is received
typedef void (__stdcall *fIrReceivedCB) ( const char * serial, const char * irCode);

//fCCFLearnCB is called during the learning process.
typedef void (__stdcall *fCCFLearnCB) ( const char * serial, int progress, const char * ccf);

//fDigitalIOCB is called in response to a digital IO command. (PIR-1 DEVELOPMENT)
typedef void (__stdcall *fDigitalIOCB) ( const char * serial, unsigned char cmd, unsigned char val);

/******************** FUNCTIONS **********************/
// To start the PIR-1 driver call open ONCE
void _stdcall pir_open(fStatusCB statusCB, fIrSentCB irSentCB, fIrReceivedCB irReceivedCB, fCCFLearnCB CCFLearnCB, fDigitalIOCB digitalIOCB );

// Sets the PIR-1 with specified serial into learning mode if state =1, pass 0 to stop learning */
void _stdcall pir_learnCCF( const char * serial, unsigned char state );
}

Can somebody give me some hints or sample code on how to call functions pir_open and pir_learnCCF from managed(C#) code. Any idea will be appreciated.

Uroš Bregar

Posted 30-Sep-11 7:23am

koleraba

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Simon Bang Terkildsen · Accepted Answer · 2011-09-30T07:30:00

have a look at the PInvoke Interop Assistant [^] it'll help you.
For the header you provided the toolkit generated this C# code:

C#

/// Return Type: void
///serial: char*
///status: unsigned char
///message: char*
[System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute(System.Runtime.InteropServices.CallingConvention.StdCall)]
public delegate void fStatusCB([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, byte status, [System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string message);

/// Return Type: void
///serial: char*
///status: unsigned char
[System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute(System.Runtime.InteropServices.CallingConvention.StdCall)]
public delegate void fIrSentCB([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, byte status);

/// Return Type: void
///serial: char*
///irCode: char*
[System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute(System.Runtime.InteropServices.CallingConvention.StdCall)]
public delegate void fIrReceivedCB([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, [System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string irCode);

/// Return Type: void
///serial: char*
///progress: int
///ccf: char*
public delegate void fCCFLearnCB([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, int progress, [System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string ccf);

/// Return Type: void
///serial: char*
///cmd: unsigned char
///val: unsigned char
public delegate void fDigitalIOCB([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, byte cmd, byte val);

public partial class NativeMethods {
    
    /// Return Type: void
    ///statusCB: fStatusCB
    ///irSentCB: fIrSentCB
    ///irReceivedCB: fIrReceivedCB
    ///CCFLearnCB: fCCFLearnCB
    ///digitalIOCB: fDigitalIOCB
    [System.Runtime.InteropServices.DllImportAttribute("<unknown>", EntryPoint="pir_open")]
public static extern  void pir_open(fStatusCB statusCB, fIrSentCB irSentCB, fIrReceivedCB irReceivedCB, fCCFLearnCB CCFLearnCB, fDigitalIOCB digitalIOCB) ;

    
    /// Return Type: void
    ///serial: char*
    ///state: unsigned char
    [System.Runtime.InteropServices.DllImportAttribute("<unknown>", EntryPoint="pir_learnCCF")]
public static extern  void pir_learnCCF([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] string serial, byte state) ;

}

remember to replease the "<unknown>" string with the name of your library file.