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PocketPC: custom RAPI class for executing routines on remote Windows CE device

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Before you begin:
The class calls CeCreateProcess RAPI function to create new process on PocketPC device. The new process executes the specified executable file.


Use the following code to test
TRapiExec class:

LOCAL rapi As TRapiExec
rapi = CREATEOBJECT("TRapiExec")
IF NOT rapi.Connected
        = MESSAGEBOX("Could not detect connection " +;
                "to Windows CE device. ", 48, "Not connected")
        RETURN
ENDIF
IF NOT rapi.RunApp("\Windows\Notes.exe",;
                "\My Documents\Personal\test.txt")
        = MESSAGEBOX("Error code: " + TRANSFORM(rapi.errorcode) +;
                " (" + TRANSFORM(rapi.errorcode, "@0") +;
                ") ", 48, "Error")
ENDIF

***************************************************
* Custom RAPI class for executing routines
* on remote Windows CE device
***************************************************
DEFINE CLASS TRapiExec As Session
#DEFINE WAIT_OBJECT_0  0
#DEFINE RAPIINIT_SIZE  12
#DEFINE PROCINFO_SIZE  16
    errorcode=0
    connected=.F.

PROCEDURE Init
    THIS.declare
    THIS.InitRapi()

PROTECTED PROCEDURE InitRapi
    LOCAL cBuffer, hEvent
    cBuffer = PADR(CHR(RAPIINIT_SIZE), RAPIINIT_SIZE, CHR(0))

    = CeRapiInitEx(@cBuffer)
    hEvent = buf2dword(SUBSTR(cBuffer,5,4))

    IF WaitForSingleObject(hEvent,2000) = WAIT_OBJECT_0
        THIS.connected = .T.
    ELSE
        THIS.UninitRapi
    ENDIF
RETURN THIS.connected

PROTECTED PROCEDURE UninitRapi
    = CeRapiUninit()
    THIS.connected = .F.

PROCEDURE Destroy
    THIS.UninitRapi

FUNCTION RunApp(cApp, cCmdLine) As Boolean
    LOCAL cBuffer, hProcess, hThread
    cBuffer = REPLICATE(CHR(0), PROCINFO_SIZE)
    IF VARTYPE(cCmdLine) <> "C"
        cCmdLine=""
    ENDIF
    IF CeCreateProcess(ToUnicode(m.cApp),;
        ToUnicode(m.cCmdline), 0,0,0,0,0,0,0, @cBuffer) = 0
        THIS.errorcode=CeGetLastError()
        RETURN .F.
    ENDIF
    hProcess = buf2dword(SUBSTR(cBuffer, 1,4))
    hThread = buf2dword(SUBSTR(cBuffer, 5,4))
    = CeCloseHandle(m.hThread)
    = CeCloseHandle(m.hProcess)
RETURN .T.

PROTECTED PROCEDURE declare
    DECLARE INTEGER CeRapiUninit IN rapi
    DECLARE INTEGER CeRapiGetError IN rapi
    DECLARE INTEGER CeGetLastError IN rapi
    DECLARE INTEGER CeRapiInitEx IN rapi STRING @pRapiInit
    DECLARE INTEGER CeCloseHandle IN rapi INTEGER hObject

    DECLARE INTEGER WaitForSingleObject IN kernel32;
        INTEGER hHandle, INTEGER dwMilliseconds

    DECLARE INTEGER CeCreateProcess IN rapi;
        STRING lpAppName, STRING lpCmdLine, INTEGER lpProcAttr,;
        INTEGER lpThreadAttr, INTEGER bInheritHandles,;
        INTEGER dwCreationFlags, INTEGER lpEnvironment,;
        INTEGER lpCurrDir, INTEGER lpStartupInfo, STRING @lpProcInfo

    DECLARE INTEGER CeRapiInvoke IN rapi;
        STRING pDllPath, STRING pFunctionName, INTEGER cbInput,;
        STRING @pInput, INTEGER @pcbOutput, STRING @ppOutput,;
        INTEGER @ppIRAPIStream, INTEGER dwReserved
ENDDEFINE

********************* static members **************************
FUNCTION buf2dword(lcBuffer)
RETURN Asc(SUBSTR(lcBuffer, 1,1)) + ;
    BitLShift(Asc(SUBSTR(lcBuffer, 2,1)),  8) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 3,1)), 16) +;
    BitLShift(Asc(SUBSTR(lcBuffer, 4,1)), 24)

FUNCTION ToUnicode(cStr)
RETURN STRCONV(cStr+CHR(0), 5)

FUNCTION FromUnicode(cStr)
RETURN STRTRAN(STRCONV(cStr, 6), CHR(0), "")



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2570 bytes  
Created: 2004-08-13 09:26:22  
Modified: 2011-12-10 09:20:22  
Visits in 7 days: 47  
Listed functions:
CeCloseHandle
CeCreateProcess
CeGetLastError
CeRapiGetError
CeRapiInitEx
CeRapiInvoke
CeRapiUninit
WaitForSingleObject
Printer friendly API declarations
My comment:
RunApp method of the class accepts two parameters: AppName and CommandLine.

Try the code calling various executables located inside \Windows directory on your PocketPC: Notes.exe, pxl.exe, sndplay.exe, tasks.exe, iexplore.exe, pword.exe etc.

* * *
At this point I am not aware how to terminate a remote process. There might be a way, I think, by using the CeRapiInvoke.

* * *
CeRapiInvoke function, I am still struggling with, can be used to remotely execute routines in DLLs stored on Window CE device. This function accepts DLL and function names as parameters, as well as buffer with input parameters for the remote call and buffer for output parameters.

So far I was successful only in calling functions, which do not require input parameters, like Random and GetProcessHeap (both located in Coredll.dll) and similar to them. Hopefully I will be able to add this functionality to the class some time later.

* * *
This is how to create new email message on your Pocket PC:
cApp="\Windows\tmail.exe"
cCmd=[-TO "info@yourcompany.com" -SUBJECT "Test message" ] +;
        [-BODY "Wake up!"]
rapi.RunApp(cApp, cCmd)

Note that the message will be stored in Drafts folder, not sent. Use other command line options: -CC, -BCC, -ATTACHMENT.
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User Contributed Notes:
dallgood@iservtexas.com | 2006-08-11 15:10:16
Would there be a way to have RunApp wait until the launched application was finished and closed. I played with trying to use WaitForSingleObject, but could not make it work. Thanks!

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