C语言十进制整数转成十六进制字符串输出

╰+哭是因爲堅強的太久メ 2023-01-03 04:43 307阅读 0赞

## 长整型转16进制字符串 ##

#include <stdio.h>
    #include <arpa/inet.h>
    #include <string.h>
    #include <stdlib.h>
    
    void hex_data_to_log_data(unsigned char *src, int len, char *dst)
    { 
    	int i = 0;
    	int index = 0;
    	char buff[1024] = { 0};
    	for (i = 0; i < len; i++) { 
    	    index += sprintf(buff + index, "%02x", src[i]);
    	    if (i != len - 1)
    			index += sprintf(buff + index, " ");
    	}
    	if (strlen(buff) > 0)
    		strcpy(dst, buff);
    }
    
    void print_hex_data(unsigned char *modbus_cmd, int len, char *title)
    { 
    	char log_modbus_data[1024] = { 0};
    	int size = len;
    	int offset = 0;
    	int print_len = 0;
    	int count = 0;
    	int max_len = 60;
    	
    	if (size <= max_len) { 
    		hex_data_to_log_data(modbus_cmd, size, log_modbus_data);
    		if (strlen(log_modbus_data) > 0)
    			printf("%s:%s", title, log_modbus_data);
    	} else { 
    		while (size > 0) { 
    			count++;
    			if (size > max_len)
    				print_len = max_len;
    			else
    				print_len = size;
    			
    			hex_data_to_log_data(modbus_cmd + offset, print_len, log_modbus_data);
    			if (strlen(log_modbus_data) > 0)
    				printf("%s-%d:%s", title, count, log_modbus_data);
    			offset += print_len;
    			size -= print_len;
    		}
    	}
    }
    
    int main(){ 
    	int Decimal_integer = 987654321;
    	unsigned char *Hex_buff;
    	unsigned short low16, high16;
    
        Hex_buff = (unsigned char *)malloc(10);
    	low16 = (unsigned short)(Decimal_integer & 0x0000ffff);			
    	high16 = (Decimal_integer & 0xffff0000) >> 16;
    	low16 = htons(low16);
    	high16 = htons(high16);
    	
    	memcpy(&Hex_buff[0], &high16, 2);
    	memcpy(&Hex_buff[2], &low16, 2);
    
    	print_hex_data(Hex_buff, 4, "hex data ");
    	free(Hex_buff);
    	
    	return 0;
    }