unicode下，读取数据库乱码问题

TCHAR cbContent[512];

dyn.GetFieldValue(0,cbContent,512);

// 中文会显示乱码

AfxMessageBox(cbContent);

// 编码转换

int nBufferSize = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)cbContent, -1, NULL, 0);

wchar_t *pBuffer = new wchar_t[nBufferSize+1];

MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)cbContent, -1 , pBuffer, nBufferSize*sizeof(wchar_t));

// 显示正常

AfxMessageBox(pBuffer);

delete[] pBuffer;