Advantech PCI-1682U Uživatelský manuál stáhnout pdf (Strana 42)

PCI-1680U/1682U User Manual 36

4.3.4 ReadFile

Users can use this interface to read data from CAN port which was opened. One or

more frames can be selected each time.

Syntax

BOOL ReadFile(

HANDLE hDevice,

LPVOID lpBuffer,

DWORD nNumberOfFramesToRead,

LPDWORD lpNumberOfFramesRead,

LPOVERLAPPED lpOverlapped

);

Parameters

Note! The third and fourth parameters of ReadFile are defined as byte length

in MSDN, but stand for the number of frames in Advantech CAN Win-

dows WDM&CE Driver.

Name Direction Description

hDevice Input Handle of the device which was opened.

lpBuffer Output Start address of receive buffer.

nNmberOf-

FramesToRead

Input

Number of frames to be received from drivers. The defini-

tion here is different from that in MSDN.

lpNumberOf-

FramesRead

Output

Real number of frames received from driver. The definition

here is different from that in MSDN.

lpOverlapped Input

If CreateFile uses asynchronous open, asynchronous oper-

ation must be supported here. Please refer to MSDN for

detailed instruction to asynchronous open.

*Note In WINDOWS CE,set to NULL.

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Advantech PCI-1682U Uživatelský manuál Strana 42