检测dll是32/64位 ?

void CCheck32Or64Dlg::OnButton2() {	CString fileName = "";	CFileDialog *fileDialog = new CFileDialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"Dll Files(*.dll)|*.dll|Exe Files(*.exe)|*.exe||",NULL);	if(fileDialog->DoModal()==IDOK)	{		fileName = fileDialog->GetPathName();		byte buf[4];		CFile file(fileName,CFile::modeRead);		file.Seek(0x40-4,0);		file.Read(buf,4);		int a,b,c,d;		a = int(buf[0]);		b = int(buf[1])*256;		c = int(buf[2])*256*256;		d = int(buf[3])*256*256*256;		int sum = a+b+c+d;		file.Seek(sum+4,0);		byte bufMachine[2];		file.Read(bufMachine,2);		int machine = (int)bufMachine[0] + (int)(bufMachine[1])*256;		if(machine == 0x14C)		{			MessageBox(fileDialog->GetFileName()+"是32位PE文件","检测结果");		}		else if(machine == 0x8664)		{			MessageBox(fileDialog->GetFileName()+"是64位PE文件","检测结果");		}		else		{			MessageBox("未能识别："+fileDialog->GetFileName()+"多少位的PE文件！","检测结果");		}	}}