COM_IOControl (Windows CE 3.0 Device Driver Developement)

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This function implements the serial port's I\O control routine. It is called by serial port functions such as GetComState,which is a wrapper around this function.

BOOL COM_IOControl(
DWORD
dwOpenData, 
DWORD
dwCode,

PBYTE
pBufIn,

DWORD
dwLenIn,

PBYTE
pBufOut,

DWORD
dwLenOut,

PDWORD
pdwActualOut
);

Parameters

dwOpenData

Specifies a value returned from a call to the COM_Openfunction.

dwCode

Specifies an I\O control code to be performed.

pBufIn

Pointer to data input to the device.

dwLenIn

Specifies the number of bytes being passed in.

pBufOut

Pointer to data output from the driver.

dwLenOut

Specifies the maximum number of bytes to receive from the driver.

pdwActualOut

Pointer to the actual number of bytes received from the driver.

Return Values

TRUE indicates success. FALSE indicates failure.

Remarks

This function is exported by a device driver. "COM" is the string passed in as lpszTypeduring calls to the RegisterDevicefunction.

Requirements

Runs on	Versions	Defined in	Include	Link to
Windows CE OS	1.0 and later	Mdd.c

Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

COM_IOControl

Last updated on Tuesday, July 13, 2004