127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
//
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// This is a part of the Microsoft Source Code Samples.
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// Copyright 1993 - 2002 Microsoft Corporation.
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// All rights reserved.
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// This source code is only intended as a supplement to
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// Microsoft Development Tools and/or WinHelp documentation.
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// See these sources for detailed information regarding the
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// Microsoft samples programs.
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//
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//
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// RasEnumConnections.c
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//
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// Usage:
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// RasEnumConnections
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//
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// RAS API's used:
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// RasEnumConnections
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//
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x500
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#endif
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#include <windows.h>
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#include <stdio.h>
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#include <ras.h>
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#include <raserror.h>
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#include <tchar.h>
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#include <strsafe.h>
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// Macro for counting maximum characters that will fit into a buffer
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#define CELEMS(x) ((sizeof(x))/(sizeof(x[0])))
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int __cdecl main(void)
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{
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DWORD dwRet = 0;
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LPRASCONN lpRasConn = NULL;
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LPRASCONN lpTempRasConn = NULL;
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DWORD cb = sizeof(RASCONN);
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DWORD dwConnections = 0;
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DWORD i = 0;
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BOOL fSuccess = FALSE;
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TCHAR szTempBuf[256] = {0};
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// Allocate buffer with space for at least one structure
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lpRasConn = (LPRASCONN)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, cb);
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if (NULL == lpRasConn)
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{
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printf("HeapAlloc failed.\n");
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return ERROR_OUTOFMEMORY;
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}
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lpRasConn->dwSize = sizeof(RASCONN);
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dwRet = RasEnumConnections(lpRasConn, &cb, &dwConnections);
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switch (dwRet) // Check whether RasEnumConnections succeeded
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{
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case ERROR_BUFFER_TOO_SMALL: // Since initial buffer allocation was small.
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if (HeapFree(GetProcessHeap(), 0, (LPVOID)lpRasConn)) // Free initial buffer
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{
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// And reassign a new buffer with the value returned in cb
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lpRasConn = (LPRASCONN)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, cb);
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if (NULL == lpRasConn)
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{
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printf("HeapAlloc failed.\n");
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return ERROR_OUTOFMEMORY;
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}
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lpRasConn->dwSize = sizeof(RASCONN);
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// Again call RasEnumConnections
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dwRet = RasEnumConnections(lpRasConn, &cb, &dwConnections);
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if (ERROR_SUCCESS == dwRet)
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{
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fSuccess = TRUE;
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}
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else
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{
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// RasEnumConnections failed
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printf("RasEnumConnections failed: Error = %d\n", dwRet);
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goto done;
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}
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}
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else
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{
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printf("HeapFree failed.\n");
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goto done;
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}
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break;
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case ERROR_SUCCESS: // RasEnumConnections succeeded with intial buffer allocation.
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fSuccess = TRUE;
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break;
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default: // RasEnumConnections failed with some error.
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printf("RasEnumConnections failed: Error = %d\n", dwRet);
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break;
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}
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if (fSuccess)
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{
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// RasEnumConnections succeeded. Print the results.
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printf("The following RAS connections are currently active\n\n");
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lpTempRasConn = lpRasConn;
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for (i = 0; i < dwConnections; i++)
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{
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printf("Size: %d\n", lpTempRasConn->dwSize);
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ZeroMemory((LPVOID)szTempBuf, sizeof(szTempBuf));
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StringCchPrintf(szTempBuf, CELEMS(szTempBuf), "Entry name: %s\n", lpTempRasConn->szEntryName);
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printf(szTempBuf);
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ZeroMemory((LPVOID)szTempBuf, sizeof(szTempBuf));
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StringCchPrintf(szTempBuf, CELEMS(szTempBuf), "Device name: %s\n", lpTempRasConn->szDeviceName);
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printf(szTempBuf);
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lpTempRasConn++;
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}
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}
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done:
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HeapFree(GetProcessHeap(), 0, (LPVOID)lpRasConn);
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return (int)dwRet;
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} |