Symbian 十六进制字符串转换成十进制数

TBuf<10> va;

va.Append(_L("00Fa"));//十六进制字符串

TInt result = HexString2Int(va);//转换成十进制数

TInt CSocketsEngine::HexString2Int(const TDesC & aHexStr)

{

TInt len = aHexStr.Length();

//防止溢出

if(len > 8) return 0;

TInt res = 0;

TInt tmp = 0;

const TUint16 * hexString = aHexStr.Ptr();

for (TInt i = 0; i < len; i++)

{

if( hexString[i]>= '0'&& hexString[i]<= '9' )

{

tmp = hexString[i]-'0';

} else if(hexString[i]>= 'a'&& hexString[i] <= 'f' )

{

tmp = hexString[i] -'a'+10;

}else if( hexString[i]>='A'&& hexString[i]<='F' )

{

tmp = hexString[i] - 'A' +10;

} else {

res = 0;

}

tmp <<= ((len-i-1)<<2);

res |= tmp;

}

return res;

}