read.c

来自「Windows设备驱动程序设计 (*.ppt) intoduce about h」· C语言 代码 · 共 24 行

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define NUM 64
main()
{
int i,testdev;
unsigned char buf[NUM];
for(i=0;i<NUM;i++)
	buf[i] = 1;
testdev = open("/dev/testpcidevice",O_RDWR);
if ( testdev == -1 )
{
printf("Cann't open file \n");
exit(0);
}
buf[0] = 0x3c;
read(testdev,buf,4);
for(i=0;i<5;i++)
    printf("The No.%d value is :%x\n",i,buf[i]);
close(testdev);
}