C#에서 네트워크 드라이브(Network Drive) 연결 방법

C#에서 네트워크 드라이브를 이용하기 위해서는 "mrp.dll"을 Import 해서 사용을 해야 한다.

[DllImport("mpr.dll", CharSet = CharSet.Auto)] public static extern int WNetUseConnection( IntPtr hwndOwner, [MarshalAs(UnmanagedType.Struct)] ref NETRESOURCE lpNetResource, string lpPassword, string lpUserID, uint dwFlags, StringBuilder lpAccessName, ref int lpBufferSize, out uint lpResult);

[DllImport("mpr.dll", CharSet = CharSet.Auto)] public static extern int WNetCancelConnection2( string lpName, uint dwFlags, bool fForce);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct NETRESOURCE { public uint dwScope; public uint dwType; public uint dwDisplayType; public uint dwUsage; public string lpLocalName; public string lpRemoteName; public string lpComment; public string lpProvider; }

https://learn.microsoft.com/en-us/windows/win32/api/winnetwk/nf-winnetwk-wnetuseconnectionw

WNetUseConnectionW function (winnetwk.h) - Win32 apps

https://learn.microsoft.com/en-us/windows/win32/api/winnetwk/ns-winnetwk-netresourcea

NETRESOURCEA (winnetwk.h) - Win32 apps

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실제 사용하는 예제 함수를 구현한 부분이다.

/// <summary> /// Network Drive Connect /// </summary> /// <param name="szRemoteDrive">ex: @"\\192.168.0.1\Shared" </param> /// <param name="szID">ex: "user_shared"</param> /// <param name="szPW">ex: "user_pw"</param> /// <returns></returns> public bool ConnectNetworkDrive(string szRemoteDrive, string szID, string szPW) { try { if (Directory.Exists(NETWORK_DRIVER)) { return true; } int iCapacity = 64; uint iResultFlags = 0; uint iFlags = 0; StringBuilder sb = new StringBuilder(iCapacity); NETRESOURCE ns = new NETRESOURCE(); ns.dwType = 1; // 공유 디스크 ns.lpLocalName = NETWORK_DRIVER; ns.lpRemoteName = szRemoteDrive; //ns.lpProvider = null; //입반적으로는 lpProvider를 null로 초기화를 한다. //특수한 Provider를 사용한다면 직접 지정할 수 있다. //"Microsoft Windows Network"는 기본 Provdier이다. 이것만 사용한다는 의미이다. ns.lpProvider = "Microsoft Windows Network"; int result = WNetUseConnection(IntPtr.Zero, ref ns, szPW, szID, iFlags, sb, ref iCapacity, out iResultFlags); Trace.WriteLine($"WNetUseConnection : {result}"); for (int i = 0; i < 10; i++) { Thread.Sleep(21); System.Windows.Forms.Application.DoEvents(); } if (Directory.Exists(NETWORK_DRIVER)) { return true; } else { return false; } } catch { return false; } }

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내 PC의 모든 Provider를 확인하기 위해서는 아래 MS에서 제공한 샘플을 실행 해보면 된다.

https://learn.microsoft.com/en-us/windows/win32/wnet/enumerating-network-resources

Enumerating Network Resources - Win32 apps

아래 코드는 C++ 코드이다. 이 Console 프로그램으로 소스 코드를 실행하면 Console 화면에 현재 PC의 모든 Provider를 확인할 수 있다.

#ifndef UNICODE #define UNICODE #endif #pragma comment(lib, "mpr.lib") #include <windows.h> #include <stdio.h> #include <winnetwk.h> BOOL WINAPI EnumerateFunc(LPNETRESOURCE lpnr); void DisplayStruct(int i, LPNETRESOURCE lpnrLocal); int main() { LPNETRESOURCE lpnr = NULL; if (EnumerateFunc(lpnr) == FALSE) { printf("Call to EnumerateFunc failed\n"); return 1; } else return 0; } BOOL WINAPI EnumerateFunc(LPNETRESOURCE lpnr) { DWORD dwResult, dwResultEnum; HANDLE hEnum; DWORD cbBuffer = 16384; // 16K is a good size DWORD cEntries = -1; // enumerate all possible entries LPNETRESOURCE lpnrLocal; // pointer to enumerated structures DWORD i; // // Call the WNetOpenEnum function to begin the enumeration. // dwResult = WNetOpenEnum(RESOURCE_GLOBALNET, // all network resources RESOURCETYPE_ANY, // all resources 0, // enumerate all resources lpnr, // NULL first time the function is called &hEnum); // handle to the resource if (dwResult != NO_ERROR) { printf("WnetOpenEnum failed with error %d\n", dwResult); return FALSE; } // // Call the GlobalAlloc function to allocate resources. // lpnrLocal = (LPNETRESOURCE) GlobalAlloc(GPTR, cbBuffer); if (lpnrLocal == NULL) { printf("WnetOpenEnum failed with error %d\n", dwResult); // NetErrorHandler(hwnd, dwResult, (LPSTR)"WNetOpenEnum"); return FALSE; } do { // // Initialize the buffer. // ZeroMemory(lpnrLocal, cbBuffer); // // Call the WNetEnumResource function to continue // the enumeration. // dwResultEnum = WNetEnumResource(hEnum, // resource handle &cEntries, // defined locally as -1 lpnrLocal, // LPNETRESOURCE &cbBuffer); // buffer size // // If the call succeeds, loop through the structures. // if (dwResultEnum == NO_ERROR) { for (i = 0; i < cEntries; i++) { // Call an application-defined function to // display the contents of the NETRESOURCE structures. // DisplayStruct(i, &lpnrLocal[i]); // If the NETRESOURCE structure represents a container resource, // call the EnumerateFunc function recursively. if (RESOURCEUSAGE_CONTAINER == (lpnrLocal[i].dwUsage & RESOURCEUSAGE_CONTAINER)) // if(!EnumerateFunc(hwnd, hdc, &lpnrLocal[i])) if (!EnumerateFunc(&lpnrLocal[i])) printf("EnumerateFunc returned FALSE\n"); // TextOut(hdc, 10, 10, "EnumerateFunc returned FALSE.", 29); } } // Process errors. // else if (dwResultEnum != ERROR_NO_MORE_ITEMS) { printf("WNetEnumResource failed with error %d\n", dwResultEnum); // NetErrorHandler(hwnd, dwResultEnum, (LPSTR)"WNetEnumResource"); break; } } // // End do. // while (dwResultEnum != ERROR_NO_MORE_ITEMS); // // Call the GlobalFree function to free the memory. // GlobalFree((HGLOBAL) lpnrLocal); // // Call WNetCloseEnum to end the enumeration. // dwResult = WNetCloseEnum(hEnum); if (dwResult != NO_ERROR) { // // Process errors. // printf("WNetCloseEnum failed with error %d\n", dwResult); // NetErrorHandler(hwnd, dwResult, (LPSTR)"WNetCloseEnum"); return FALSE; } return TRUE; } void DisplayStruct(int i, LPNETRESOURCE lpnrLocal) { printf("NETRESOURCE[%d] Scope: ", i); switch (lpnrLocal->dwScope) { case (RESOURCE_CONNECTED): printf("connected\n"); break; case (RESOURCE_GLOBALNET): printf("all resources\n"); break; case (RESOURCE_REMEMBERED): printf("remembered\n"); break; default: printf("unknown scope %d\n", lpnrLocal->dwScope); break; } printf("NETRESOURCE[%d] Type: ", i); switch (lpnrLocal->dwType) { case (RESOURCETYPE_ANY): printf("any\n"); break; case (RESOURCETYPE_DISK): printf("disk\n"); break; case (RESOURCETYPE_PRINT): printf("print\n"); break; default: printf("unknown type %d\n", lpnrLocal->dwType); break; } printf("NETRESOURCE[%d] DisplayType: ", i); switch (lpnrLocal->dwDisplayType) { case (RESOURCEDISPLAYTYPE_GENERIC): printf("generic\n"); break; case (RESOURCEDISPLAYTYPE_DOMAIN): printf("domain\n"); break; case (RESOURCEDISPLAYTYPE_SERVER): printf("server\n"); break; case (RESOURCEDISPLAYTYPE_SHARE): printf("share\n"); break; case (RESOURCEDISPLAYTYPE_FILE): printf("file\n"); break; case (RESOURCEDISPLAYTYPE_GROUP): printf("group\n"); break; case (RESOURCEDISPLAYTYPE_NETWORK): printf("network\n"); break; default: printf("unknown display type %d\n", lpnrLocal->dwDisplayType); break; } printf("NETRESOURCE[%d] Usage: 0x%x = ", i, lpnrLocal->dwUsage); if (lpnrLocal->dwUsage & RESOURCEUSAGE_CONNECTABLE) printf("connectable "); if (lpnrLocal->dwUsage & RESOURCEUSAGE_CONTAINER) printf("container "); printf("\n"); printf("NETRESOURCE[%d] Localname: %S\n", i, lpnrLocal->lpLocalName); printf("NETRESOURCE[%d] Remotename: %S\n", i, lpnrLocal->lpRemoteName); printf("NETRESOURCE[%d] Comment: %S\n", i, lpnrLocal->lpComment); printf("NETRESOURCE[%d] Provider: %S\n", i, lpnrLocal->lpProvider); printf("\n"); }