As long as the managed code does not resize the vector, you can access the buffer and pass it as a pointer with vector.data() (for C++0x) or &vector[0]. This results in a zero-copy system. Example C++ API: #define EXPORT extern “C” __declspec(dllexport) typedef intptr_t ItemListHandle; EXPORT bool GenerateItems(ItemListHandle* hItems, double** itemsFound, int* itemCount) { auto … Read more
R.NET is pretty buggy with the newer version of R. And if it doesn’t work right, it works terribly (and will continue to do so unless you know exactly how to fix it). Personally, I’d recommend using R script files and executing them. What you should do is start your R script with > sink() … Read more
If I recall correctly — and my memory on this is a bit fuzzy, it has been a long time since I took the Excel PIA apart — it’s like this. An event is essentially a method that an object calls when something happens. In .NET, events are delegates, plain and simple. But in COM, … Read more
You have several options: (int) — Cast operator. Works if the object already is an integer at some level in the inheritance hierarchy or if there is an implicit conversion defined. int.Parse()/int.TryParse() — For converting from a string of unknown format. int.ParseExact()/int.TryParseExact() — For converting from a string in a specific format Convert.ToInt32() — For … Read more
If you mean video modes are available resolutions, try to invoke EnumDisplaySettingsEx details can be found here: http://msdn.microsoft.com/en-us/library/dd162612(VS.85).aspx small program that lists available resolutions: using System; using System.Linq; using System.Runtime.InteropServices; using System.Windows.Forms; namespace ListResolutions { class Program { [DllImport(“user32.dll”)] public static extern bool EnumDisplaySettings( string deviceName, int modeNum, ref DEVMODE devMode); const int ENUM_CURRENT_SETTINGS = … Read more
BlockingCollection will indeed pump while blocking. I’ve learnt that while answering the following question, which has some interesting details about STA pumping: StaTaskScheduler and STA thread message pumping However, it will pump a very limited undisclosed set of COM-specific messages, same as the other APIs you listed. It won’t pump general purpose Win32 messages (a … Read more
Working code using FindWindow method: [DllImport(“user32.dll”)] public static extern IntPtr FindWindow(string className, string windowTitle); [DllImport(“user32.dll”)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool ShowWindow(IntPtr hWnd, ShowWindowEnum flags); [DllImport(“user32.dll”)] private static extern int SetForegroundWindow(IntPtr hwnd); [DllImport(“user32.dll”)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool GetWindowPlacement(IntPtr hWnd, ref Windowplacement lpwndpl); private enum ShowWindowEnum { Hide = 0, ShowNormal = 1, ShowMinimized = 2, … Read more
If what you’re really looking into is a good excuse to teach yourself how to interact with other apps, this may not be the best one. Web browsers are messy, the timing is going to be unpredictable, etc. So, you’ve taken on a very hard task—and one that would be very easy if you did … Read more
I recommend the approaches detailed here. It starts by explaining how to execute strings of Python code, then from there details how to set up a Python environment to interact with your C program, call Python functions from your C code, manipulate Python objects from your C code, etc. EDIT: If you really want to … Read more
Yes, you want Marshal::GetFunctionPointerForDelegate(). Your code snippet is missing the managed function you’d want to call, I just made one up. You will also have to declare the managed delegate type and create an instance of it before you can get a function pointer. This worked well: #include “stdafx.h” using namespace System; using namespace System::Runtime::InteropServices; … Read more