COM_IOControl (Windows Embedded CE 6.0)

1/6/2010

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.

Syntax

BOOL COM_IOControl(
  DWORD dwOpenData,
  DWORD dwCode,
  PBYTE pBufIn,
  DWORD dwLenIn,
  PBYTE pBufOut,
  DWORD dwLenOut,
  PDWORD pdwActualOut 
);

Parameters

• dwOpenData
  [in] Specifies a value returned from a call to the COM_Open function.

• dwCode
  [in] Specifies an I/O control code to be performed.

• pBufIn
  [in] Pointer to data input to the device.

• dwLenIn
  [in] Specifies the number of bytes being passed in.

• pBufOut
  [out] Pointer to data output from the driver.

• dwLenOut
  [out] Specifies the maximum number of bytes to receive from the driver.

• pdwActualOut
  [out] Pointer to the number of bytes received from the driver.

Return Value

TRUE indicates success. FALSE indicates failure.

Remarks

This function is exported by a device driver. "COM" is the string passed in as lpszType during calls to the RegisterDevice function.

Requirements

See Also

Reference

Serial Port Driver MDD Functions
COM_Open
RegisterDevice