NBS.TCP_Read (FB)

This function block of the ⇘ CAA_NetBaseServices.library serves to read data from the previously established connection given in hConnection. As long as xEnable is TRUE the handle of the connection is valid. The pointer pData specifies the memory area to write the read data to. szSize defines the max number of bytes to read. When the data was read successfully, xReady is set to TRUE and szCount indicates the actually read number of bytes.

Input:

xEnable	BOOL	see: ⇘ “CAA 指南”
hConnection	CAA.HANDLE	Handle of the connection
szSize	CAA.SIZE	Maximum number of bytes to be read; can be retrieved via operator SIZEOF
pData	CAA.PVOID	Target address for the first byte to be read; can be retrieved via operator ADR

Output:

xDone	BOOL	see: ⇘ “CAA 指南”
xBusy	BOOL	see: ⇘ “CAA 指南”
xError	BOOL	see: ⇘ “CAA 指南”
eError	NBS.ERROR	Error id
xReady	BOOL	TRUE: Data received FALSE: No data received
szCount	CAA.SIZE	Size of the received data