void CDlgReportPreview::GetPrinterPara(TCHAR *szDevice,TCHAR szDriver,TCHAR *szOutput)
{
HKEY hOpenKey1,hOpenKey2;
long lResult = 0;
DWORD dwKeyValueType = 0;
DWORD dwKeyValueLength = 0;

LPCTSTR keyName2 = L "Printers\\Ports ";
//换了下面用到keyName2位置它的值不是Printers\Ports
CString str;
str.Format(_T( "Driver "));
LPCWSTR lpSubKey = TEXT( "Printers ");

LPCTSTR dwKeyName2 = TEXT( "Port5 ");

CString keyName1(L "Printers\\ ");
// LPTSTR keyName1 = L "Printers\\ ";如果是这样，第二次传入它的会添加了szDevice的值；
TCHAR strKeyValue[500];

CComboBox* pCmbReg = (CComboBox*)GetDlgItem(IDC_COMBO_PRINTER);
UpdateData(TRUE);
CString strText;
LPCTSTR lpctText;
pCmbReg-> GetWindowText(strText);
lpctText = (LPCTSTR)strText;
wsprintf(szDevice,lpctText);

keyName1 += lpctText;
// wcscat(keyName1,lpctText);
lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE,keyName1,0,0,&hOpenKey1);
ASSERT(lResult == ERROR_SUCCESS);

//read szDevice, szDriver and szOutput value
ZeroMemory(strKeyValue,sizeof(TCHAR)*50);
dwKeyValueLength = sizeof(TCHAR)*50;

lResult = RegQueryValueEx(hOpenKey1,str,0,&dwKeyValueType,
(BYTE*)strKeyValue,&dwKeyValueLength);
ASSERT(lResult == ERROR_SUCCESS);

wsprintf(szDriver,strKeyValue);
RegCloseKey(hOpenKey1);

//LPCTSTR keyName2 = L "Printers\\Ports "; 它返回的值不是我想要的。
lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE,keyName2,0,0,&hOpenKey2);
ASSERT(lResult == ERROR_SUCCESS);


ZeroMemory(strKeyValue,sizeof(TCHAR)*500);
lResult = RegQueryValueEx(hOpenKey2,dwKeyName2,0,&dwKeyValueType,
(BYTE*)strKeyValue,&dwKeyValueLength);
ASSERT(lResult == ERROR_SUCCESS);

wsprintf(szOutput,strKeyValue);
RegCloseKey(hOpenKey2);
}

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