This is a simple sample of reading files with AsyncRead().
#include <ctype.h>
#include <errno.h>
#include <nwerrno.h>
#include <nwfileio.h>
#include <nwsemaph.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main( int argc, char* argv[]) {
int fhandle;
LONG loc_sem;
int ccode;
LONG bytes_read;
T_cacheBufferStructure* cache_bufs;
LONG num_of_buffers;
LONG num_of_bytes_to_print;
char* ptr;
size_t i;
if ( argc != 2) {
puts( "Usage: LOAD ASYNCRD <filename>\n"
"where <filename> - file name to read");
return EXIT_FAILURE;
}
if (( fhandle = open( argv[ 1], O_RDONLY)) == -1) {
printf( "open failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
return EXIT_FAILURE;
}
if (( loc_sem = OpenLocalSemaphore( 0)) == 0) {
printf( "OpenLocalSemaphore failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
close( fhandle);
return EXIT_FAILURE;
}
if (( ccode = AsyncRead( fhandle,
0,
2 * 1024,
&bytes_read,
loc_sem,
&cache_bufs,
&num_of_buffers)) != 0) {
printf( "AsyncRead failed, errno = %d ( %s ), NetWareErrno = %d\n",
errno, strerror( errno), NetWareErrno);
CloseLocalSemaphore( loc_sem);
close( fhandle);
return EXIT_FAILURE;
}
WaitOnLocalSemaphore( loc_sem);
printf( "bytes_read = %d, num_of_buffers = %d\n", bytes_read, num_of_buffers);
printf( "buffer #1: completionCode = %d,\n"
" cacheBufferLength = %d,\n"
" cacheBufferPointer = %x\n",
cache_bufs -> completionCode,
cache_bufs -> cacheBufferLength,
cache_bufs -> cacheBufferPointer);
num_of_bytes_to_print = cache_bufs -> cacheBufferLength < 1024 ?
cache_bufs -> cacheBufferLength : 1024;
ptr = cache_bufs -> cacheBufferPointer;
for ( i = 0; i < num_of_bytes_to_print; ++i, ++ptr) {
printf( "%c", isprint( *ptr) ? *ptr : '.');
}
AsyncRelease( cache_bufs);
CloseLocalSemaphore( loc_sem);
close( fhandle);
return EXIT_SUCCESS;
}
© 2008 Novell, Inc. All Rights Reserved.
