gbk to utf8 utf8 to gbk

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GBK和UTF8之间的转换

By Cnangel on October
8, 2012 10:10 AM | No Comments

关于GBK和UTF-8之间的转换，很多初学者会很迷茫。

一般来说GBK和UTF-8是文字的编码方式，其对应的内码是不一样的，所以GBK和UTF-8的转换需要对内码进行一一映射，然后进行转换。

对于一般系统上的工程，一般使用libiconv即可，但是对于嵌入式或手机操作系统，libiconv显得就有点庞大了。

在这里提供GBK和UTF8转换以及全半角、大小写转换等函数，希望对手机开发的同学有所帮助，特别是在iOS上开发的同学。

strnormalize.h

strnormalize.c

具体全半角、简繁体转换使用方法见下代码：

#include "strnormalize.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



int main(int argc, char **argv)

{

str_normalize_init();

unsigned options = SNO_TO_LOWER | SNO_TO_HALF;

if (argc > 1) options = atoi(argv[1]);



char *buffer = (char *)malloc(65536);

memset(buffer, 0, 65536);

while (fgets(buffer, 65536, stdin))

{

str_normalize_utf8(buffer, options);

printf("%s", buffer);

}

free(buffer);



return 0;

}

UTF-8和GBK转换使用方法如下：

#include "strnormalize.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdint.h>

int main(int argc, char **argv)

{

str_normalize_init();

const char *utf8 = "我是utf-8字符！";

const char *gbk = "����GBK�ַ���";

uint32_t utf8_len = strlen(utf8);

uint32_t gbk_len = strlen(utf8);

uint32_t utf8buffer_len = utf8_len * 3 + 1;

uint32_t gbkbuffer_len = gbk_len * 2 + 1;

char *utf8buffer = (char *)malloc(utf8buffer_len);

char *gbkbuffer = (char *)malloc(gbkbuffer_len);

memset(utf8buffer, 0, utf8buffer_len);

memset(gbkbuffer, 0, gbkbuffer_len);

utf8_to_gbk(utf8, utf8_len, &gbkbuffer, &gbkbuffer_len);

gbk_to_utf8(gbk, gbk_len, &utf8buffer, &utf8buffer_len);

printf("utf8: %s<=>%d \t gbkbuffer: %s<=>%d\n", utf8, utf8_len, gbkbuffer, gbkbuffer_len);

printf("gbk: %s<=>%d \t utf8buffer: %s<=>%d\n", gbk, gbk_len, utf8buffer, utf8buffer_len);

free(utf8buffer);

free(gbkbuffer);

return 0;

}