字符串转码UTF8转码为GBK的C语⾔程序源代码
GBK和UTF8之间的转换可以使⽤两个API，⽅法是先把它们转换为中间编码Unicode，再转换为对应的编码即可。
unicode字符转中文
#include <stdio.h>
#include <windows.h>
//GBK编码转换到UTF8编码
int GBKToUTF8(unsigned char * lpGBKStr,unsigned char * lpUTF8Str,int nUTF8StrLen)
{
wchar_t * lpUnicodeStr = NULL;
int nRetLen = 0;
if(!lpGBKStr) //如果GBK字符串为NULL则出错退出
return 0;
nRetLen = ::MultiByteToWideChar(CP_ACP,0,(char *)lpGBKStr,-1,NULL,NULL); //获取转换到Unicode编码后所需要的字符空间长度lpUnicodeStr = new WCHAR[nRetLen + 1]; //为Unicode字符串空间
nRetLen = ::MultiByteToWideChar(CP_ACP,0,(char *)lpGBKStr,-1,lpUnicodeStr,nRetLen); //转换到Unicode编码
if(!nRetLen) //转换失败则出错退出
return 0;
nRetLen = ::WideCharToMultiByte(CP_UTF8,0,lpUnicodeStr,-1,NULL,0,NULL,NULL); //获取转换到UTF8编码后所需要的字符空间长度
if(!lpUTF8Str) //输出缓冲区为空则返回转换后需要的空间⼤⼩
{
if(lpUnicodeStr)
delete []lpUnicodeStr;
return nRetLen;
}
if(nUTF8StrLen < nRetLen) //如果输出缓冲区长度不够则退出
{
if(lpUnicodeStr)
delete []lpUnicodeStr;
return 0;
}
nRetLen = ::WideCharToMultiByte(CP_UTF8,0,lpUnicodeStr,-1,(char *)lpUTF8Str,nUTF8StrLen,NULL,NULL); //转换到UTF8编码
return nRetLen;
}
// UTF8编码转换到GBK编码
int UTF8ToGBK(unsigned char * lpUTF8Str,unsigned char * lpGBKStr,int nGBKStrLen)
{
wchar_t * lpUnicodeStr = NULL;
int nRetLen = 0;
if(!lpUTF8Str) //如果UTF8字符串为NULL则出错退出
return 0;
nRetLen = ::MultiByteToWideChar(CP_UTF8,0,(char *)lpUTF8Str,-1,NULL,NULL); //获取转换到Unicode编码后所需要的字符空间长度lpUnicodeStr = new WCHAR[nRetLen + 1]; //为Unicode字符串空间
nRetLen = ::MultiByteToWideChar(CP_UTF8,0,(char *)lpUTF8Str,-1,lpUnicodeStr,nRetLen); //转换到Unicode编码
if(!nRetLen) //转换失败则出错退出
return 0;
nRetLen = ::WideCharToMultiByte(CP_ACP,0,lpUnicodeStr,-1,NULL,NULL,NULL,NULL); //获取转换到GBK编码后所需要的字符空间长度
if(!lpGBKStr) //输出缓冲区为空则返回转换后需要的空间⼤⼩
{
if(lpUnicodeStr)
delete []lpUnicodeStr;
return nRetLen;
}
if(nGBKStrLen < nRetLen) //如果输出缓冲区长度不够则退出
{
if(lpUnicodeStr)
delete []lpUnicodeStr;
return 0;
}
nRetLen = ::WideCharToMultiByte(CP_ACP,0,lpUnicodeStr,-1,(char *)lpGBKStr,nRetLen,NULL,NULL); //转换到GBK编码
return nRetLen;
}
//使⽤这两个函数的例⼦
int main()
{
char cGBKStr[] = "我是中国⼈!";
char * lpGBKStr = NULL;
char * lpUTF8Str = NULL;
FILE * fp = NULL;
int nRetLen = 0;
nRetLen = GBKToUTF8((unsigned char *)cGBKStr,NULL,NULL);
printf("转换后的字符串需要的空间长度为：%d ",nRetLen);
lpUTF8Str = new char[nRetLen + 1];
nRetLen = GBKToUTF8((unsigned char *)cGBKStr,(unsigned char *)lpUTF8Str,nRetLen);
if(nRetLen)
{
printf("GBKToUTF8转换成功！");
}
else
{
printf("GBKToUTF8转换失败！");
goto Ret0;
}
fp = fopen("C:\GBK转","wb"); //保存到⽂本⽂件
fwrite(lpUTF8Str,nRetLen,1,fp);
fclose(fp);
getchar(); //先去打开那个⽂本⽂件看看，单击记事本的“⽂件”-“另存为”菜单，在对话框中看到编码框变为了“UTF-8”说明转换成功了
nRetLen = UTF8ToGBK((unsigned char *)lpUTF8Str,NULL,NULL); //再转回来
printf("转换后的字符串需要的空间长度为：%d ",nRetLen);
lpGBKStr = new char[nRetLen + 1];
nRetLen = UTF8ToGBK((unsigned char *)lpUTF8Str,(unsigned char *)lpGBKStr,nRetLen);
if(nRetLen)
{
printf("UTF8ToGBK转换成功！ ");
}
else
{
printf("UTF8ToGBK转换失败！ ");
goto Ret0;
}
fp = fopen("C:\UTF8转","wb"); //保存到⽂本⽂件
fwrite(lpGBKStr,nRetLen,1,fp);
fclose(fp);
getchar(); //再去打开⽂本⽂件看看，发现编码框⼜变为了“ANSI”说明转换成功了
Ret0:
if(lpGBKStr)
delete []lpGBKStr;
if(lpUTF8Str)
delete []lpUTF8Str;
return 0;
}

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