COM_IOControl
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8/28/2008
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
| Header | Developer Implemented |
| Library | Serial.lib |
| Windows Embedded CE | Windows CE 1.0 and later |