Advantech RISC SOM-A2558 Información técnica descargar pdf (Pagina 31)

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Advantech SOM-A200 series Software Manual

DeviceIoControl to perform the driver-specific functions.

lpInBuffer

[in] Long pointer to a buffer that contains the data required to perform the operation.

This parameter can be NULL if the dwIoControlCode parameter specifies an operation that does not

require input data.

nInBufferSize

[in] Size, in bytes, of the buffer pointed to by lpInBuffer.

lpOutBuffer

[out] Long pointer to a buffer that receives the operation's output data.

This parameter can be NULL if the dwIoControlCode parameter specifies an operation that does not

produce output data.

nOutBufferSize

[in] Size, in bytes, of the buffer pointed to by lpOutBuffer.

lpBytesReturned

[out] Long pointer to a variable that receives the size, in bytes, of the data stored into the buffer

pointed to by lpOutBuffer.

The lpBytesReturned parameter cannot be NULL. Even when an operation produces no output data,

and lpOutBuffer can be NULL, the Device-IoControl function makes use of the variable pointed to by

lpBytesReturned. After such an operation, the value of the variable is without meaning.

lpOverlapped

[in] Ignored; set to NULL.

- Return Values

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

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Advantech RISC SOM-A2558 Información técnica Pagina 31