Handling Command Line Parameters (Windows CE 5.0)
Services.exe supports the IOCTL_SERVICE_COMMAND_LINE_PARAMS IOCTL for handling command line parameters. This IOCTL can be used to indicate that a set of command-line arguments are being passed to the service from the command-line tool.
For example, a user could type the following information using the Services.exe command line tool: "services command HTP0: Arg1 Arg2 Arg3". The command string indicates that a set of arguments follows after the service instance name (HTP0:). Services.exe should pass these arguments directly to the service's xxx_IOControl (Services.exe) function.
The Services.exe command-line tool is particularly useful for applications that have only few configuration options and do not require a separate application to configure them.
The following example shows how to print out each command line argument to a debug output window and displays a "Mission accomplished" message.
xxx_IOControl(....) {
case IOCTL_SERVICE_COMMAND_LINE_PARAMS:
{
ServicesExeCommandLineParams *pCmdLine = (ServicesExeCommandLineParams*) pBufIn;
DEBUGMSG(1,(L"xxx_IOCTL got IOCTL_SERVICE_COMMAND_LINE_PARAMS, # args = %d\r\n",pCmdLine->dwArgs));
for (DWORD i = 0; i < pCmdLine->dwArgs; i++) {
DEBUGMSG(1,(L" xxx_IOCTL arg %d = %s\r\n",i,pCmdLine->ppwszArgs[i]));
}
WCHAR *szBuf = (WCHAR*)pBufOut;
DEBUGCHK(szBuf[0] == 0);
wsprintf(szBuf,L"Mission accomplished!!!");
return TRUE;
}
break;
}
Note In the past, some services have used the parameters of xxx_IOControl incorrectly. For example, some services have used the pBufIn parameter to pass a 32-bit DWORD value instead of a pointer. Services.exe no longer supports this incorrect usage. Before calling into your service, services.exe will now perform extra checks to make sure that the 32-bit value is a legal pointer. If the value for pBufIn is not legal, services.exe will not call xxx_IOControl.
See Also
Services.exe | Using Services.exe from the Command Line
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