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cerapiinvoke (rapi)
 

rapi is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for cerapiinvoke in other DLLs exists, click on Find References to the right.

.
Summary
Call custom function contained in DLL on Windows CE Device via the RAPI.

C# Signature:

[DllImport("rapi.dll", CharSet = CharSet.Unicode, SetLastError = true)]

internal extern static int CeRapiInvoke(

   string pDllPath,
   string pFunctionName,
   uint cbInput,
   IntPtr pInput,
   out uint pcbOutput,
   out IntPtr ppOutput,
   IntPtr ppIRAPIStream,
   uint dwReserved);

User-Defined Types:

None.

Notes:

sDllPath must be in the MSDOS 8.3 filename format. Any other format that results in a larger filename will

fail. You can use this to access records in databases on the Windows CE Device. Therefore, no platform

invoke for the CeDatabase functions are needed.

Sample Code: [C#]

string sDllPath = @"\dbaccess.dll";

string sFunction = @"MyFunction";

int hResult = CeRapiInvoke(sDllPath, sFunction, 0, IntPtr.Zero, out uiOutput, out pOutput, IntPtr.Zero, 0);

if ( hResult != 0 )

{

   // Execution Failed

}

unsafe

{

   retOutput = new string((char*)pOutput.ToPointer());

}

Sample DLL: [C++]

[dbaccess.h]

#ifndef DBACCESS_H

#define DBACCESS_H

#ifndef RAPISTREAMFLAG

typedef enum tagRAPISTREAMFLAG

{

    STREAM_TIMEOUT_READ

} RAPISTREAMFLAG;

DECLARE_INTERFACE_ (IRAPIStream, IStream )

{

    STDMETHOD(SetRapiStat)(THIS_ RAPISTREAMFLAG Flag, DWORD dwValue) PURE;
    STDMETHOD(GetRapiStat)(THIS_ RAPISTREAMFLAG Flag, DWORD *pdwValue) PURE;

};

#endif

#ifdef __cplusplus

extern "C"{

#endif

__declspec (dllexport) INT MyFunction( DWORD, BYTE*, DWORD*, BYTE*, IRAPIStream *, PVOID );

#ifdef __cplusplus

}

#endif

#endif

[dbaccess.cpp]

#include "dbaccess.h"

#define MAXSTRINGLENGTH 1024

BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)

{

    return TRUE;

}

INT MyFunction( DWORD cbInput, BYTE pInput, DWORD pcbOutput, BYTE *ppOutput, IRAPIStream *pStream, PVOID reserved )

{

    LPTSTR outBuffer;

    outBuffer = (LPTSTR) LocalAlloc( LPTR, sizeof(TCHAR) * MAXSTRINGLENGTH );

    wsprintf( outBuffer, _T("This is just a Test!") );

pcbOutput = sizeof(TCHAR) MAXSTRINGLENGTH;

  • ppOutput = (PBYTE) outBuffer;

    LocalFree( pInput );
    return 0;

}

Documentation

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