Advantech PCI-1682U Manual de usuario descargar pdf (Pagina 52)

PCI-1680U/1682U User Manual 46

4.3.10 GetOverlappedResult

When user's operation cannot be finished immediately in asynchronous mode, this

function should be called to wait operation to be completed.

Syntax

BOOL GetOverlappedResult(

HANDLE hDevice,

LPOVERLAPPED lpOverlapped,

LPDWORD lpNumberOfFramesTransferred,

BOOL bWait

);

Parameters

Return Value

Successful: return non-zero values. Unsuccessful: return zero value. Please call Get-

LastError function.

Example

#include <windows.h>

#include <stdio.h>

void main( )

{

HANDLE hDevice;

OVERLAPPED ov;

BOOL bSuccess;

DWORD dwEvtMask;

DWORD dwLength;

hDevice = CreateFile( "\\\\.\\CAN1",

GENERIC_READ | GENERIC_WRITE,

0, // exclusive access

NULL, // default security attributes

OPEN_EXISTING,

FILE_FLAG_OVERLAPPED,

NULL

);

Name Direction Description

hDevice Input Handle of the device which was opened.

lpOverlapped Input

Events need to be waited are included. Refer to MSDN

for more information.

lpNumberOf-

FramesTransferred

Output

ReadFile and WriteFile are real numbers of data written

and read; WaitCommEvent is not defined.

bWait Input

TRUE, will not return until read/write operation is fin-

ished. FALSE, return immediately no matter the opera-

tion is finished or not. Call GetLastError to return

ERROR_IO_INCOMPLETE. Refer to MSDN for

detailed information.

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