不同字符编码格式之间的转换

//zhang20120228 在线课程的搜索功能，将unicode转换为utf8
void CSearchWndHC::UrlEncodeUtf8(LPCTSTR  pszUrl, LPTSTR  pResult, long * plLen)
{
	// TODO: Add your specialized code here.
	if(pszUrl == NULL)
	{
		//*pResult = 0;
		*plLen = 0;
		return ;
	}
	int iLen = lstrlen(pszUrl);
	if (pResult == 0) 
	{
		*plLen = 0;
		return;
	}
	pResult[0]=0;
	int i = 0;
	BYTE j,k;
	BYTE* p=(BYTE* )pszUrl;
	while(*p)
	{
		if((*p <=_T('9') && *p >=_T('0'))||(*p <=_T('z') && *p >=_T('a'))||(*p
			<=_T('Z') && *p >=_T('A')))
		{
			pResult[i++]=*p++;
		}
		else
		{
			if(*p <0 ||*p >127)
			{
				j= *p/16;k=*p%16;
				
				if(j > 9) j+=_T('A')-10;
				
				else j+=48;
				
				if(k > 9) k+=_T('A')-10;
				
				else k+=48;
				
				pResult[i++]=_T('%');
				
				pResult[i++]=j;
				
				pResult[i++]=k;
				
				p++;
				
				j= *p/16;k=*p%16;
				
				if(j > 9) j+=_T('A')-10;
				
				else j+=48;
				
				if(k > 9) k+=_T('A')-10;
				
				else k+=48;
				
				pResult[i++]=_T('%');
				
				pResult[i++]=j;
				
				pResult[i++]=k;
				
				p++;
				
			}
			
			else 
			{
				j= *p/16;k=*p%16;
				
				if(j > 9) j+=_T('A')-10;
				
				else j+=48;
				
				if(k > 9) k+=_T('A')-10;
				else k+=48;
				pResult[i++]=_T('%');
				pResult[i++]=j;
				pResult[i++]=k;
				p++;
			}
		}
	}
	pResult[i]=0;
	*plLen = i;
	//*ppResult = pResult;
}
//zhang20120228 在线课程的搜索功能，将unicode转换为utf8
LPTSTR  CSearchWndHC::translateTCHARToUTF_8(LPTSTR xmlStream, int len) 

{
	HRESULT hr;
	IMultiLanguage *pMultiLanguage=NULL;
	UINT  one=0;
	UINT  two=0;
	DWORD pdwMode=0;
	LPTSTR  m_setstr=NULL;
	LPTSTR  m_getstr=NULL;
	LPTSTR  finalTCHARBuffer=NULL ;
	CoInitialize(NULL);
	hr=CoCreateInstance(CLSID_CMultiLanguage,NULL,CLSCTX_ALL,IID_IMultiLanguage ,(void**)&pMultiLanguage);
	
	if( FAILED(hr))
	{
		return 0;
	}
	one=len;
	m_setstr=(LPTSTR )xmlStream;
	hr=pMultiLanguage->ConvertString(&pdwMode,COVS_0001,COVS_0030,(unsigned char*)m_setstr,&one,NULL,&two);
	//hr=pMultiLanguage->ConvertString(&pdwMode,20936,65001,(unsigned char*)m_setstr,&one,NULL,&two);
	
	if( FAILED(hr))
		
	{
		pMultiLanguage->Release();
		CoUninitialize();
		delete[] m_getstr;
		return 0;                 
	}
	m_getstr=new TCHAR[two + 1];
	memset( m_getstr, _T('\0'), two + 1 );
	//hr=pMultiLanguage->ConvertString(&pdwMode,20936,65001,(unsigned char*)m_setstr,&one,(unsigned char*)m_getstr,&two);
	hr=pMultiLanguage->ConvertString(&pdwMode,COVS_0001,COVS_0030,(unsigned char*)m_setstr,&one,(unsigned char*)m_getstr,&two);
	if( FAILED(hr))
	{
		pMultiLanguage->Release();
		CoUninitialize();
		delete[] m_getstr;
		return 0;                  
	}
	pMultiLanguage->Release();
	CoUninitialize();
	finalTCHARBuffer = new TCHAR[two+1];
	memset(finalTCHARBuffer,0,sizeof(finalTCHARBuffer));
	memcpy(finalTCHARBuffer,m_getstr,two+1);
	delete[] m_getstr;      
	return finalTCHARBuffer;
	pMultiLanguage->Release();
	CoUninitialize();
	delete[] m_getstr;
	return 0;
}

urlencode函数

#include <stdio.h>
#include <IOSTREAM>
using namespace std;

typedef unsigned char BYTE;  
   
BYTE toHex(const BYTE &x)  
{  
    return x > 9 ? x -10 + 'A': x + '0';  
}  
  
BYTE fromHex(const BYTE &x)  
{  
    return isdigit(x) ? x-'0' : x-'A'+10;  
}  

string URLEncode(const string &sIn)  
{  
    string sOut;  
    for( size_t ix = 0; ix < sIn.size(); ix++ )  
    {        
        BYTE buf[4];  
        memset( buf, 0, 4 );  
        if( isalnum( (BYTE)sIn[ix] ) )  
        {        
            buf[0] = sIn[ix];  
        }  
        //else if ( isspace( (BYTE)sIn[ix] ) ) //貌似把空格编码成%20或者+都可以  
        //{  
        //    buf[0] = '+';  
        //}  
        else  
        {  
            buf[0] = '%';  
            buf[1] = toHex( (BYTE)sIn[ix] >> 4 );  
            buf[2] = toHex( (BYTE)sIn[ix] % 16);  
        }  
        sOut += (char *)buf;  
    }  
    return sOut;  
}

string URLDecode(const string &sIn)  
{  
    string sOut;  
    for( size_t ix = 0; ix < sIn.size(); ix++ )  
    {  
        BYTE ch = 0;  
        if(sIn[ix]=='%')  
        {  
            ch = (fromHex(sIn[ix+1])<<4);  
            ch |= fromHex(sIn[ix+2]);  
            ix += 2;  
        }  
        else if(sIn[ix] == '+')  
        {  
            ch = ' ';  
        }  
        else  
        {  
            ch = sIn[ix];  
        }  
        sOut += (char)ch;  
    }  
    return sOut;  
} 


int main(int argc, char* argv[])
{
	printf("Hello World!\n");
	
	string str = "数学zhang";
	string out = URLEncode(str);
	string instr = URLDecode(out);

	cout<<out.c_str()<<endl;
	cout<<instr.c_str()<<endl;

	return 0;
}