RasGetEntryProperties返回所有零
RasGetEntryProperties返回所有零
提问于 2015-07-14 08:56:24
我试图使用RasGetEntryProperties获取有关我的一个电话簿条目的信息，但当我这样做时，返回的RASENTRY结构包含除dwSize和dwOptions以外的所有元素的零或空白。
我不完全了解这些数据是如何工作的，但我想我至少应该看到存储在电话簿中的设备名称或电话号码……
这是我的代码：
uint dwEntryInfoSize = 0;
uint i = RasGetEntryProperties(null, "", IntPtr.Zero, ref dwEntryInfoSize, IntPtr.Zero, IntPtr.Zero);
RASENTRY getRasEntry = new RASENTRY();
string entryName = "Dial-up Connection test";
getRasEntry.dwSize = (int)dwEntryInfoSize;
IntPtr ptrRasEntry = Marshal.AllocHGlobal((int)dwEntryInfoSize);
Marshal.StructureToPtr(getRasEntry, ptrRasEntry, false);
uint j = RasGetEntryProperties(null, entryName, ptrRasEntry, ref dwEntryInfoSize, IntPtr.Zero, IntPtr.Zero);
RASENTRY outRasEntry = (RASENTRY)Marshal.PtrToStructure(ptrRasEntry, typeof(RASENTRY));
Marshal.FreeHGlobal(ptrRasEntry);
下面是Visual调试器中outRasEntry的部分屏幕截图.
编辑这里是我对RASENTRY的定义
const int MAX_PATH = 260;
[StructLayout(LayoutKind.Sequential)]
public struct RASENTRY
{
public int dwSize;
public int dwfOptions;
public int dwCountryID;
public int dwCountryCode;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxAreaCode+1)]
public string szAreaCode;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxPhoneNumber+1)]
public string szLocalPhoneNumber;
public int dwAlternateOffset;
public RASIPADDR ipaddr;
public RASIPADDR ipaddrDns;
public RASIPADDR ipaddrDnsAlt;
public RASIPADDR ipaddrWins;
public RASIPADDR ipaddrWinsAlt;
public int dwFrameSize;
public int dwfNetProtocols;
public int dwFramingProtocol;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) MAX_PATH)]
public string szScript;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) MAX_PATH)]
public string szAutodialDll;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) MAX_PATH)]
public string szAutodialFunc;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxDeviceType + 1)]
public string szDeviceType;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxDeviceName + 1)]
public string szDeviceName;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxPadType + 1)]
public string szX25PadType;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxX25Address + 1)]
public string szX25Address;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxFacilities + 1)]
public string szX25Facilities;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxUserData + 1)]
public string szX25UserData;
public int dwChannels;
public int dwReserved1;
public int dwReserved2;
public int dwSubEntries;
public int dwDialMode;
public int dwDialExtraPercent;
public int dwDialExtraSampleSeconds;
public int dwHangUpExtraPercent;
public int dwHangUpExtraSampleSeconds;
public int dwIdleDisconnectSeconds;
public int dwType;
public int dwEncryptionType;
public int dwCustomAuthKey;
public Guid guidId;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) MAX_PATH)]
public string szCustomDialDll;
public int dwVpnStrategy;
public int dwfOptions2;
public int dwfOptions3;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxDnsSuffix)]
public string szDnsSuffix;
public int dwTcpWindowSize;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) MAX_PATH)]
public string szPrerequisitePbk;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst =
(int) RasFieldSizeConstants.RAS_MaxEntryName)]
public string szPrerequisiteEntry;
public int dwRedialCount;
public int dwRedialPause;
RASIPV6ADDR ipv6addrDns;
RASIPV6ADDR ipv6addrDnsAlt;
public int dwIPv4InterfaceMetric;
public int dwIPv6InterfaceMetric;
RASIPV6ADDR ipv6addr;
public int dwIPv6PrefixLength;
public int dwNetworkOutageTime;
}
public enum RasFieldSizeConstants
{
RAS_MaxDeviceType = 16,
RAS_MaxPhoneNumber = 128,
RAS_MaxIpAddress = 15,
RAS_MaxIpxAddress = 21,
RAS_MaxEntryName = 256,
RAS_MaxDeviceName = 128,
RAS_MaxCallbackNumber = RAS_MaxPhoneNumber,
RAS_MaxAreaCode = 10,
RAS_MaxPadType = 32,
RAS_MaxX25Address = 200,
RAS_MaxFacilities = 200,
RAS_MaxUserData = 200,
RAS_MaxReplyMessage = 1024,
RAS_MaxDnsSuffix = 256,
UNLEN = 256,
PWLEN = 256,
DNLEN = 15
}
public struct RASIPADDR {
byte a;
byte b;
byte c;
byte d;
}
public struct RASIPV6ADDR
{
byte a;
byte b;
byte c;
byte d;
byte e;
byte f;
}回答 1
Stack Overflow用户
回答已采纳
发布于 2015-07-14 10:20:58
谢谢leppie为我指明了dotras.codeplex.com的方向-尽管我最终没有使用那个库，但是查看它的源代码帮助我修复了我自己的.
关键在于RASENTRY的定义.下面第一行的改动使它发挥了作用。
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 4)]
public struct RASENTRY
{
public int dwSize;
public int dwfOptions;
public int dwCountryID;
public int dwCountryCode;
// etc.页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31402123
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