其实我的本意是GPS数据吐出来的不都是ASCII吗，都当做字符串处理
我解析到变量char card_latitude[22]={0x0};
         card_latitude 赋值 "3803.2312";
然后我有个数组char gps_info_buffer[70] = {0};
int currlen =0;
gps_info_buffer[currlenn++] = 0x7e;
gps_info_buffer[currlenn++] = 0x11;
gps_info_buffer[currlenn++] = 0x22;

int latitude = 0;
latitude = (int)(atof(card_latitude) *10e5);
    dbg_print("latitude is %d\r\n",latitude);
    sprintf((char *)(gps_info_buffer + currlen), "%x", latitude);
    currlen += 4;

我个人认为gps_info _buffer 该是 7e 11 22 02 44 53 B8 (16进制)

可是结果不对？是 7e 11 22 30  00 00 00

还是没看懂你的意图。那个latitude = (int) (atof(card_latitude) * 10e5);是干嘛用的？这个结果已经溢出，你自己没看过的吗？