gfdRead( )

Description | Example

Name:	int gfdRead (int handle, char *buffer, int size, int *bytesread)
Inputs:	int handle	· Valid pipe handle returned from gfdMakeNmPipe or gfdOpen and connected with gfdConnectNmPipe.
	int size	· Specifies the number of bytes to be read from the pipe.
Outputs:	int *bytesread	· Points to the variable that receives the number of bytes read from the pipe.
	char *buffer	· Points to the buffer that receives the data.
Returns:	GFD_ACCESS_DENIED	· Pipe is not in correct state.
	GFD_INVALID_HANDLE	· Wrong pipe handle.
	GFD_NOT_INSTALLED	· Dispatcher is not running.
	GFD_SUCCESS	· Successful.
Includes:	gfdmsg.h gfdipc.h

Description

The gfdRead( ) function reads bytes of data, up to a specified number, from a pipe into a buffer. gfdRead may read fewer than the specified number of bytes if fewer are available. The return value is GFD_SUCCESS if the function is successful.

Example

int channel;

int result;

int appHandle;

struct gfx_rt_message datagram;

int len;  
/* Main processing loop -- never ends. */

while(1)  /* Check for data on this pipe. */

{

 result = gfdRead(appHandle,(char*)&datagram, 

	 sizeof(datagram),&len);

   if((result==0) &&(len>0)){

	   if(datagram.header.function == GFXRTBP_CALLTERM)

	      printf("CallTermination on channel", " %d\n",

      datagram.header.source);

      /*Fax channel that sent message */

    }

	sleep (2);

 }  
 

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