convert unsigned long to char*

以下方法明天验证

unsigned long val=0x0F2345FF87654321;
 char str[65]={0}; 
 sprintf(str, "%I32d", val);//十进制显示方式

 sprintf(str, "%32x", val);//十六进制显示方式

 

long to char*

 unsigned long ll = 1234567;
        printf("%d\n", ll);
        char c[4];
        memcpy(c, &ll, 4);

       char* to  long

        unsigned long lm = 0;
        memcpy(&lm, c, 4);
        printf("%d\n", lm);
        return 0;

memcpy(&lm,c,sizeof(unsigned long));

 

unsigned long aa = 199191928;
.....
(void)snprintf( buf, sizeof( buf ),"%ld", aa );
...
(void)fprintf(stderr,"buf = %ld\n", atol(buf) );

 

unsigned long   ul=200000;

 char dest[8];
 ultoa(ul,dest,16);
 char hexstr[]="0x30d40";
 unsigned long l_d;
 l_d=strtoul(hexstr,NULL,16);
 printf("string = %s unsigned long = %lu , l_d = %lu \n ,please enter ",dest,ul,l_d);

 char greecode[]="E0";
 char ircode[3];
    unsigned long  num=strtoul(greecode,NULL,16);
 char cnum=(char) num;
 ircode[0]=cnum;