iphelper | 易学教程

Remote address of active UDP connections in Windows using IP Helper

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问题 The function GetUdpTable() in IP Helper returns a table of MIB_UDPROW. MIB_UDPROW struct does not contain any information about the remote address of the UDP connection, the extended variants of GetUdpTable() only adds the pid to the return struct. Is it possible to get the remote address for an active UDP connection using IP Helper (or any other winapi)? 回答1: No, it is not possible to get the remote port of the UDP connection unless you capture traffic and inspect the packets since UDP is a

Segmentation fault when changing default gateway

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问题 I wrote a simple application on Qt4 that modifier network adapter parameters, for that I have a slot called setInterfaceParams , implemented as so: DWORD WinNetInterface::setInterfaceParams(QString index, QString ip, QString netmask, QString gateway) { DWORD res = NULL; HINSTANCE lib = (HINSTANCE) LoadLibrary((WCHAR *)"iphlpapi.dll"); _SetAdapterIpAddress SetAdapterIpAddress = (_SetAdapterIpAddress) GetProcAddress(lib, "SetAdapterIpAddress"); PWSTR pszGUID = NULL; //char *szGUID = (char *

How do you parse an IP address string to a uint value in C#?

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问题 I'm writing C# code that uses the windows IP Helper API. One of the functions I'm trying to call is "GetBestInterface" that takes a 'uint' representation of an IP. What I need is to parse a textual representation of the IP to create the 'uint' representation. I've found some examples via Google, like this one or this one, but I'm pretty sure there should be a standard way to achieve this with .NET. Only problem is, I can't find this standard way. IPAddress.Parse seems to be in the right

Get UDP connection statistics from IP Helper API (iphlpapi.dll)

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问题 I would like to count the bytes received and sent from specific UDP connections in Windows 10. This answer lists an approach to count bytes for specific TCP connections using GetPerTcpConnectionEStats() from the IP Helper API ( iphlpapi.dll ). I would like to mirror this approach for UDP connections. The IP Helper API provides UDP and TCP implementations for almost all functions (e.g., GetTcpTable() , GetUdpTable() ), except the documentation does not list GetPerUdpConnectionEStats() . This

Weird issue regarding GetOwnerModuleFromTcpEntry when targeting x64

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问题 Since I am a first time poster, I do apologize if I unintentionally left out any key piece of information, but here it goes. Background: I am doing some testing to find out what the undocumented member array ‘OwningModuleInfo’ in MIB_TCPROW_OWNER_MODULE is and how it aid said function in determining what process owns the TCP endpoint. I have reached the conclusion that the first item in the array is the index of the service in the list of running services, which brings us to the weird issue.

How do you find out which NIC is connected to the internet?

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问题 Consider the following setup: A windows PC with a LAN interface and a WiFi interface (the standard for any new laptop). Each of the interfaces might be connected or disconnected from a network. I need a way to determine which one of the adapters is the one connected to the internet - specifically, in case they are both connected to different networks, one with connection to the internet and one without. My current solution involves using IPHelper's "GetBestInterface" function and supplying it

How do you parse an IP address string to a uint value in C#?

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I'm writing C# code that uses the windows IP Helper API. One of the functions I'm trying to call is " GetBestInterface " that takes a 'uint' representation of an IP. What I need is to parse a textual representation of the IP to create the 'uint' representation. I've found some examples via Google, like this one or this one , but I'm pretty sure there should be a standard way to achieve this with .NET. Only problem is, I can't find this standard way. IPAddress.Parse seems to be in the right direction, but it doesn't supply any way of getting a 'uint' representation... There is also a way of