MFC字符串转换（UTF8、gb2312）_cstring转gb2312

#ifndef _ttol
#define _ttol ToolBase::TToL
#endif
 
class ToolBase
{
public:
	static CString UTF8ToGB2312(const char *pSrc, int iLen)
	{
		char pResult[2048] = {0};
		int i = 0, j = 0;
		while (i < iLen)
		{
			if (pSrc[i] < 0 && i+2<iLen && pSrc[i+1] < 0 && pSrc[i+2] < 0)
			{
				WCHAR Wtemp = UTF8ToUnicode__(pSrc + i);
				char Ctemp[4] = {0};
				UnicodeToGB2312__(Ctemp, Wtemp);
				pResult[j] = Ctemp[0];
				pResult[j + 1] = Ctemp[1];
				i += 3;
				j += 2;
			}
			else
			{
				pResult[j++] = pSrc[i++];
			}
		}
 
		return CString(pResult);
	}
 
    static long TToL(const CString& data)
    {
        USES_CONVERSION;
        char* tmp = T2A(data);
 
        return atol(tmp);
    }
 
private:
	static WCHAR UTF8ToUnicode__(const char pSrc[3])
	{
		WCHAR Wtemp;
		char* uchar = (char *)&Wtemp;
		uchar[1] = ((pSrc[0] & 0x0F) <<