2024年2月21日发(作者：)
C/C++ 字符编码的转换(ut8、gb2312)
//这是个类strCoding (strCoding.h文件)
#pragma once
#include
#include
#include
using namespace std;
class strCoding
{
public:
strCoding(void);
~strCoding(void);
void UTF_8ToGB2312(string &pOut, char *pText, int pLen);//utf_8转为gb2312
void GB2312ToUTF_8(string& pOut,char *pText, int pLen); //gb2312 转utf_8
string UrlGB2312(char * str); //urlgb2312编码
string UrlUTF8(char * str); //urlutf8 编码
string UrlUTF8Decode(string str); //urlutf8解码
string UrlGB2312Decode(string str); //urlgb2312解码
private:
void Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer);
void UTF_8ToUnicode(WCHAR* pOut,char *pText);
void UnicodeToUTF_8(char* pOut,WCHAR* pText);
void UnicodeToGB2312(char* pOut,WCHAR uData);
char CharToInt(char ch);
char StrToBin(char *str);
};
//这是个类strCoding (文件)
#include "StdAfx.h"
#include ".strcoding.h"
strCoding::strCoding(void)
{
}
strCoding::~strCoding(void)
{
}
void strCoding::Gb2312ToUnicode(WCHAR* pOut,char *gbBuffer)
{
::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,pOut,1);
return;
}
void strCoding::UTF_8ToUnicode(WCHAR* pOut,char *pText)
{
char* uchar = (char *)pOut;
uchar[1] = ((pText[0] & 0x0F) << 4) + ((pText[1] >> 2) & 0x0F);
uchar[0] = ((pText[1] & 0x03) << 6) + (pText[2] & 0x3F);
return;
}
void strCoding::UnicodeToUTF_8(char* pOut,WCHAR* pText)
{
// 注意 WCHAR高低字的顺序,低字节在前，高字节在后
char* pchar = (char *)pText;
pOut[0] = (0xE0 | ((pchar[1] & 0xF0) >> 4));
pOut[1] = (0x80 | ((pchar[1] & 0x0F) << 2)) + ((pchar[0] & 0xC0) >> 6);
pOut[2] = (0x80 | (pchar[0] & 0x3F));
return;
}
void strCoding::UnicodeToGB2312(char* pOut,WCHAR uData)
{
WideCharToMultiByte(CP_ACP,NULL,&uData,1,pOut,sizeof(WCHAR),NULL,NULL);
return;
}
//做为解Url使用
char strCoding:: CharToInt(char ch){
if(ch>='0' && ch<='9')return (char)(ch-'0');
if(ch>='a' && ch<='f')return (char)(ch-'a'+10);
if(ch>='A' && ch<='F')return (char)(ch-'A'+10);
return -1;
}
char strCoding::StrToBin(char *str){
char tempWord[2];
char chn;
tempWord[0] = CharToInt(str[0]); //make the B to 11 -- 00001011
tempWord[1] = CharToInt(str[1]); //make the 0 to 0 -- 00000000
chn = (tempWord[0] << 4) | tempWord[1]; //to change the BO to 10110000
return chn;
}
//UTF_8 转gb2312
void strCoding::UTF_8ToGB2312(string &pOut, char *pText, int pLen)
{
char buf[4];
char* rst = new char[pLen + (pLen >> 2) + 2];
memset(buf,0,4);
memset(rst,0,pLen + (pLen >> 2) + 2);
int i =0;
int j = 0;
while(i < pLen)
{
if(*(pText + i) >= 0)
{
rst[j++] = pText[i++];
}
else
{
WCHAR Wtemp;
UTF_8ToUnicode(&Wtemp,pText + i);
UnicodeToGB2312(buf,Wtemp);
unsigned short int tmp = 0;
tmp = rst[j] = buf[0];
tmp = rst[j+1] = buf[1];
tmp = rst[j+2] = buf[2];
//newBuf[j] = Ctemp[0];
//newBuf[j + 1] = Ctemp[1];
i += 3;
j += 2;
}
}
rst[j]='0';
pOut = rst;
delete []rst;
}
//GB2312 转为 UTF-8
void strCoding::GB2312ToUTF_8(string& pOut,char *pText, int pLen)
{
char buf[4];
memset(buf,0,4);
();
int i = 0;
while(i < pLen)
{
//如果是英文直接复制就可以
if( pText[i] >= 0)
{
char asciistr[2]={0};
asciistr[0] = (pText[i++]);
(asciistr);
}
else
{
WCHAR pbuffer;
Gb2312ToUnicode(&pbuffer,pText+i);
UnicodeToUTF_8(buf,&pbuffer);
(buf);
i += 2;
}
}
return;
}
//把str编码为网页中的 GB2312 url encode ,英文不变，汉字双字节 如%3D%AE%88
string strCoding::UrlGB2312(char * str)
{
string dd;
size_t len = strlen(str);
for (size_t i=0;i { if(isalnum((BYTE)str[i])) { char tempbuff[2]; sprintf(tempbuff,"%c",str[i]); (tempbuff); } else if (isspace((BYTE)str[i])) { ("+"); } else { char tempbuff[4]; sprintf(tempbuff,"%%%X%X",((BYTE*)str)[i] >>4,((BYTE*)str)[i] %16); (tempbuff); } } return dd; } //把str编码为网页中的 UTF-8 url encode ,英文不变，汉字三字节 如%3D%AE%88 string strCoding::UrlUTF8(char * str) { string tt; string dd; GB2312ToUTF_8(tt,str,(int)strlen(str)); size_t len=(); for (size_t i=0;i { if(isalnum((BYTE)(i))) { char tempbuff[2]={0}; sprintf(tempbuff,"%c",(BYTE)(i)); (tempbuff); } else if (isspace((BYTE)(i))) { ("+"); } else { char tempbuff[4]; sprintf(tempbuff,"%%%X%X",((BYTE)(i)) >>4,((BYTE)(i)) %16); (tempbuff); } } return dd; } //把url GB2312解码 string strCoding::UrlGB2312Decode(string str) { string output=""; char tmp[2]; int i=0,idx=0,ndx,len=(); while(i if(str[i]=='%'){ tmp[0]=str[i+1]; tmp[1]=str[i+2]; output += StrToBin(tmp); i=i+3; } else if(str[i]=='+'){ output+=' '; i++; } else{ output+=str[i]; i++; } } return output; } //把url utf8解码 string strCoding::UrlUTF8Decode(string str) { string output=""; string temp =UrlGB2312Decode(str);// UTF_8ToGB2312(output,(char *)(),strlen(())); return output; } //test #include "stdafx.h" #include "strCoding.h" using namespace std; int main() { strCoding cfm; string keyword="大家好,欢迎你"; string Temp=""; string Output=""; //把关键字做url的utf8编码 Temp= 8((char *)()); cout< //把url的utf8编码的结果解码 Temp =8Decode(Temp); cout< //把关键字做url的gb2312编码 Temp =2312((char *)()); cout< //把url的gb2312编码的结果解码 Temp =2312Decode(Temp); cout< //把关键字GB2312转UTF_8 2312ToUTF_8(Output,(char *)(),strlen(())); cout< //把GB2312转UTF_8转为中文 _8ToGB2312(Temp,(char *)(),strlen(())); cout< //system("pasue"); getchar(); return 0; // } 在VC7win32下调试通过
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