Using ctAPI Library in c#

Hi, My code is as below:
public void Init() { IntPtr hCTAPI = CTAPI.ctOpen(null, "u1", "1", 2); TestMe(hCTAPI); } [DllImport("ctapi.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern IntPtr ctOpen(string sComputerName, string sUsername, string sPassword, UInt32 nMode); [DllImport("ctapi.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true)] public static extern bool ctTagRead(IntPtr hCTAPI, [MarshalAs(UnmanagedType.LPStr)] string tag, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder value, int length); public static void TestMe(IntPtr ip) { var tag = "tag1"; var tagPtr = Marshal.StringToHGlobalAnsi(tag); System.Text.StringBuilder vsl = new StringBuilder(20); bool b = ctTagRead(ip, tag, vsl, 20);//, tagValueItemsPtr); }
bool b is always false. I dont know what to do!

I used GetLastError Function and I found out there is a "No connection could be made because the target machine actively refused it" error. but I am trying to connect to citect on my own computer which has an installed and working citect on it, and in citect.ini [ctapi] remote is set to 1.

I do not use Citect software, so I will not be able to help with the answer, but I will at least help make your post easier to read for others that may be able to help. This is the C# code formatted:

Thanks

Open with CtApi

Hi, did you end up getting it to work?

Try setting the first three arguments to ctOpen to null, since these are not needed when connecting to a Citect instance on the same computer.

The CTAPI function reference also recommends that you set the mode argument to 0.

E.g.
hCTAPI = ctOpen(NULL, NULL, NULL, 0);

Also, I believe that .NET uses Unicode strings. Make sure all strings you pass through CTAPI are ANSI or the tag name will be invalid, causing ctTagRead to always return false.

Hi Maximus,
Nope, It did not work for me.
I Injected a DLL into Citect to do my work. But my antivirus is now suspicious of what I do.
Thanks