如何获取打印机的网络路径（\\ COMPUTER \ PRINTERNAME）

Question

如何从默认打印机窗口C++获取打印机的网络路径（\ COMPUTER \ PRINTERNAME）。

Answer 1

在this forum post发现可能做的伎俩这段代码：

你肯定会当然需要在Windows SDK。您可能还需要链接到线程中提到的winspool.lib库，尽管它看起来像这个代码从注册表中检索名称，所以我的猜测是您没有。如果您使用此代码，请评论您修复的任何怪癖，或者您是否需要与winspool.lib链接。您可能还想检查this other related Stack Overflow post。如果我是你，我会先用GetDefaultPrinter函数，然后默认为下面的代码，如果它返回0

#ifdef UNICODE 
    #define GETDEFAULTPRINTER "GetDefaultPrinterW" 
#else 
    #define GETDEFAULTPRINTER "GetDefaultPrinterA" 
#endif 

CString GetDefaultPrinterName() 
{ 
    CString strPrinterName = TEXT("") ; 
    OSVERSIONINFO osv; 

    // --- Get the operationg system versin info --- 
    osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); 
    GetVersionEx(&osv) ; 

    BOOL bRet = FALSE ; 
    // If Windows 95 or 98, use EnumPrinters. 
    if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) 
    { 
     // The first EnumPrinters() tells you how big our buffer must 
     // be to hold ALL of PRINTER_INFO_2. Note that this will 
     // typically return FALSE. This only means that the buffer (the 4th 
     // parameter) was not filled in. You do not want it filled in here. 
     DWORD dwNeeded = 0 , dwReturned = 0 ; 
     SetLastError(0); 
     bRet = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, NULL, 0, &dwNeeded, &dwReturned); 
     if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0)) 
      return CString("") ; 

     PRINTER_INFO_2 * ppi2 = reinterpret_cast<PRINTER_INFO_2 *>(new char[dwNeeded]) ; 
     if(!ppi2) 
      return CString("") ; 

     // The second EnumPrinters() will fill in all the current information. 
     bRet = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, (LPBYTE)ppi2, dwNeeded, &dwNeeded, &dwReturned); 
     if(!bRet) 
     { 
      char * pTemp = reinterpret_cast<char *>(ppi2) ; 
      delete []pTemp ; 

      return CString(""); 
     } 

     // --- Get the printer name --- 
     strPrinterName = ppi2->pPrinterName ; 

     // --- Free memory --- 
     char * pTemp = reinterpret_cast<char *>(ppi2) ; 
     delete []pTemp ; 
    } 

    // If Windows NT, use the GetDefaultPrinter API for Windows 2000, 
    // or GetProfileString for version 4.0 and earlier. 
    else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT) 
    { 
     // Windows 2000 or later (use explicit call) 
     // --- Call GetDefaultPrinter() to get the printer name --- 
     if (osv.dwMajorVersion >= 5) 
     { 
      // --- Load library winspool.drv --- 
      HMODULE hSpoolDrv = LoadLibrary("winspool.drv") ; 
      if(!hSpoolDrv) 
       return CString(""); 

      // --- function type definition --- 
      typedef BOOL (FAR PASCAL *FNGETPRINTER)(LPTSTR ,LPDWORD); 
      FNGETPRINTER fnGetPrinter = (FNGETPRINTER)GetProcAddress(hSpoolDrv, GETDEFAULTPRINTER) ; 
      if(fnGetPrinter) 
      { 
       LPTSTR szPrinterName[MAX_PATH] ; 
       DWORD nLen = MAX_PATH ; 
       bRet = fnGetPrinter((LPTSTR)szPrinterName,&nLen); 
       // --- Function call succeeds, then set the printer name --- 
       if(bRet) 
        strPrinterName = (char *)szPrinterName ; 
      } 
      FreeLibrary(hSpoolDrv) ; 
     } 
     else// --- NT4.0 or earlier --- 
     { 
      // Retrieve the default string from Win.ini (the registry). 
      // String will be in form "printername,drivername,portname". 
      TCHAR szBuffer[MAX_PATH] ; 
      // --- HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\Version --- 
      if (GetProfileString("windows", "device", ",,,", szBuffer, MAX_PATH) <= 0) 
       return CString(""); 

      // Printer name precedes first "," character. 
      strtok(szBuffer, ","); 

      if(lstrlen(szBuffer) <= 0) 
       return CString("") ; 

      // --- Set the printer name --- 
      strPrinterName = szBuffer ; 
     } 
    } 

    return strPrinterName ; 
}