函数原型：
int WideCharToMultiByte(
UINT CodePage, // code page
DWORD dwFlags, // performance and mapping flags
LPCWSTR lpWideCharStr, // wide-character string
int cchWideChar, // number of chars in string
LPSTR lpMultiByteStr, // buffer for new string
int cbMultiByte, // size of buffer
LPCSTR lpDefaultChar, // default for unmappable chars
LPBOOL lpUsedDefaultChar // set when default char used
); //将宽字符转换成多个窄字符
int MultiByteToWideChar(
UINT CodePage, // code page
DWORD dwFlags, // character-type options
LPCSTR lpMultiByteStr, // string to map
int cbMultiByte, // number of bytes in string
LPWSTR lpWideCharStr, // wide-character buffer
int cchWideChar // size of buffer
);//将多个窄字符转换成宽字符
需要用到的一些函数：
CString CXmlProcess::HexToBin(CString string)//将16进制数转换成2进制
{
if( string == \"0\") return \"0000\";
if( string == \"1\") return \"0001\";
if( string == \"2\") return \"0010\";
if( string == \"3\") return \"0011\";
if( string == \"4\") return \"0100\";
if( string == \"5\") return \"0101\";
if( string == \"6\") return \"0110\";
if( string == \"7\") return \"0111\";
if( string == \"8\") return \"1000\";
if( string == \"9\") return \"1001\";
if( string == \"a\") return \"1010\";
if( string == \"b\") return \"1011\";
if( string == \"c\") return \"1100\";
if( string == \"d\") return \"1101\";
if( string == \"e\") return \"1110\";
if( string == \"f\") return \"1111\";
return \"\";
}
CString CXmlProcess::BinToHex(CString BinString)//将2进制数转换成16进制
{
if( BinString == \"0000\") return \"0\"; [Page]
if( BinString == \"0001\") return \"1\";
if( BinString == \"0010\") return \"2\";
if( BinString == \"0011\") return \"3\";
if( BinString == \"0100\") return \"4\";
if( BinString == \"0101\") return \"5\";
if( BinString == \"0110\") return \"6\";
if( BinString == \"0111\") return \"7\";
if( BinString == \"1000\") return \"8\";
if( BinString == \"1001\") return \"9\";
if( BinString == \"1010\") return \"a\";
if( BinString == \"1011\") return \"b\";
if( BinString == \"1100\") return \"c\";
if( BinString == \"1101\") return \"d\";
if( BinString == \"1110\") return \"e\";
if( BinString == \"1111\") return \"f\";
return \"\";
}
int CXmlProcess::BinToInt(CString string)//2进制字符数据转换成10进制整型
{
int len =0;
int tempInt = 0;
int strInt = 0;
for(int i =0 ;i < string.GetLength() ;i ++)
{
tempInt = 1;
strInt = (int)string.GetAt(i)-48;
for(int k =0 ;k < 7-i ; k++)
{
tempInt = 2*tempInt;
}
len += tempInt*strInt;
}
return len;
}
UTF-8转换成GB2312先把UTF-8转换成Unicode.然后再把Unicode通过函数WideCharToMultiByte转换成GB2312
WCHAR* CXmlProcess::UTF_8ToUnicode(char *ustart) //把UTF-8转换成Unicode
{
char char_one;
char char_two;
char char_three;
int Hchar;
int Lchar;
char uchar[2];
WCHAR *unicode;
CString string_one;
CString string_two;
CString string_three;
CString combiString;
char_one = *ustart;
char_two = *(ustart+1); [Page]
char_three = *(ustart+2);
string_one.Format(\"%x\",char_one);
string_two.Format(\"%x\",char_two);
string_three.Format(\"%x\",char_three);
string_three = string_three.Right(2);
string_two = string_two.Right(2);
string_one = string_one.Right(2);
string_three = HexToBin(string_three.Left(1))+HexToBin(string_three.Right(1));
string_two = HexToBin(string_two.Left(1))+HexToBin(string_two.Right(1));
string_one = HexToBin(string_one.Left(1))+HexToBin(string_one.Right(1));
combiString = string_one +string_two +string_three;
combiString = combiString.Right(20);
combiString.Delete(4,2);
combiString.Delete(10,2);
Hchar = BinToInt(combiString.Left(8));
Lchar = BinToInt(combiString.Right(8));
uchar[1] = (char)Hchar;
uchar[0] = (char)Lchar;
unicode = (WCHAR *)uchar;
return unicode;
}
char * CXmlProcess::UnicodeToGB2312(unsigned short uData) //把Unicode 转换成 GB2312
{
char *buffer ;
buffer = new char[sizeof(WCHAR)];
WideCharToMultiByte(CP_ACP,NULL,&uData,1,buffer,sizeof(WCHAR),NULL,NULL);
return buffer;
}
GB2312转换成UTF-8：先把GB2312通过函数MultiByteToWideChar转换成Unicode.然后再把Unicode通过拆开Unicode后拼装成UTF-8。
WCHAR * CXmlProcess::Gb2312ToUnicode(char *gbBuffer) //GB2312 转换成 Unicode
{
WCHAR *uniChar;
uniChar = new WCHAR[1];
::MultiByteToWideChar(CP_ACP,MB_PRECOMPOSED,gbBuffer,2,uniChar,1);
return uniChar;
}
char * CXmlProcess::UnicodeToUTF_8(WCHAR *UniChar) // Unicode 转换成UTF-8
{
char *buffer;
CString strOne;
CString strTwo;
CString strThree;
CString strFour;
CString strAnd;
buffer = new char[3];
int hInt,lInt;
hInt = (int)((*UniChar)/256);
lInt = (*UniChar)%256;
CString string ;
string.Format(\"%x\",hInt);
strTwo = HexToBin(string.Right(1));
string = string.Left(string.GetLength() - 1);
strOne = HexToBin(string.Right(1));
string.Format(\"%x\",lInt); [Page]
strFour = HexToBin(string.Right(1));
string = string.Left(string.GetLength() -1);
strThree = HexToBin(string.Right(1));
strAnd = strOne +strTwo + strThree + strFour;
strAnd.Insert(0,\"1110\");
strAnd.Insert(8,\"10\");
strAnd.Insert(16,\"10\");
strOne = strAnd.Left(8);
strAnd = strAnd.Right(16);
strTwo = strAnd.Left(8);
strThree = strAnd.Right(8);
*buffer = (char)BinToInt(strOne);
buffer[1] = (char)BinToInt(strTwo);
buffer[2] = (char)BinToInt(strThree);
return buffer;
}
例子：将GB2312转换成UTF-8的调用：
char * CXmlProcess::translateCharToUTF_8(char *xmlStream, int len)
{
int newCharLen =0 ;
int oldCharLen = 0;
int revCharLen = len;
char* newCharBuffer;
char* finalCharBuffer;
char *buffer ;
CString string;
buffer = new char[sizeof(WCHAR)];
newCharBuffer = new char[int(1.5*revCharLen)];//设置最大的一个缓冲区
while(oldCharLen < revCharLen)
{
if( *(xmlStream + oldCharLen) >= 0)
{
*(newCharBuffer+newCharLen) = *(xmlStream +oldCharLen);
newCharLen ++;
oldCharLen ++;
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