c/c++ GB2312编码和UTF-8互转

#include <stdio.h>

#include <Windows.h>

#include <string.h>

/*************************************************

*将GB2312编码的字符串转为UTF-8编码

*输入:

*p:指向待转码字符串

*返回:

*指向已转码字符串的指针

*过程:

*将GB2312转为Unicode编码

*再将Unicode转为UTF-8

*************************************************/

char* Gb2312ToUtf8(char *p){

	DWORD dwNum = MultiByteToWideChar(CP_ACP, 0, p, -1, NULL, 0);

	char *psText;

	wchar_t *pwText = (wchar_t*)malloc(dwNum*sizeof(wchar_t));

	dwNum = MultiByteToWideChar(CP_ACP ,0 ,p ,-1 ,pwText ,dwNum );

	dwNum = WideCharToMultiByte(CP_UTF8,0,pwText,-1,NULL,0,NULL,NULL);

	psText=(char*)malloc(dwNum*sizeof(char));

	dwNum = WideCharToMultiByte(CP_UTF8,0,pwText,-1,psText,dwNum,NULL,NULL);

	free(pwText);

	return psText;

}

/*************************************************

*将UTF-8编码的字符串转为GB2312编码

*输入:

*p:指向待转码字符串

*返回:

*指向已转码字符串的指针

*过程:

*将UTF-8转为Unicode编码

*再将Unicode转为GB2312

*************************************************/

char* Utf8ToGb2312(char *p){

	DWORD dwNum = MultiByteToWideChar(CP_UTF8,0,p,-1,NULL,0);

	char *psText;

	wchar_t *pwText=(wchar_t*)malloc(dwNum*sizeof(wchar_t));

	dwNum = MultiByteToWideChar(CP_UTF8,0,p,-1,pwText,dwNum);

	dwNum = WideCharToMultiByte(CP_ACP,0,pwText,-1,NULL,0,NULL,NULL);

	psText=(char*)malloc(dwNum*sizeof(char));

	dwNum = WideCharToMultiByte(CP_ACP,0,pwText,-1,psText,dwNum,NULL,NULL);

	free(pwText);

	return psText;

}

int main(){

	char *source = "Hello world!";                                       //英文字符串测试

	char *result;

	result = Gb2312ToUtf8(source);

	printf("%s\n",result);

	result = Utf8ToGb2312(result);

	printf("%s\n",result);

	source="测试";

	result = Gb2312ToUtf8(source);                                   //中文字符串测试，不支持UTF-8编码汉字，会出现乱码

	printf("%s\n",result);

	result = Utf8ToGb2312(result);									//GB2312编码的汉字则能正常显示

	printf("%s\n",result);

	system("pause");

	return 0;

}