app.c

来自「Epson BA-T500USB在Linux 2.4下的设备驱动」· C语言 代码 · 共 32 行

//app.c for t500usb USB module testing
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <string.h>

int main(int argc, char* argv[])
{
	char* str;
	int i, j;
			
	int fd = open("/dev/usb/t500usb", O_RDWR);
	if(fd == -1)
	{
		printf("Open BA-T500USB port failed!\n");
		return -1;
	}
	
        str = "a123456789b123456789\x0a c123456789d123456789\x0a e123456789f123456789\x0a g123456789\x0a";

	j = write(fd, str, strlen(str));
	
	//if str include "\x0", you should use like this: write(fd, str, 77);

	printf("%d=%s", j, str);

	close(fd);
}