pinvoke

问题 I've an application which has a system tray icon. While uninstalling I'm killing the process if its running. So, as am not gracefully stopping the app, the icon remains in the system tray and will remove only if we hover the mouse on it. I wrote a code that would run the cursor along the tray and get the cursor back in its initial position. This is what I have done: [DllImport("user32.dll")] static extern IntPtr FindWindow(string className, string windowName); [DllImport("user32.dll")] static

问题 Quick question (hopefully), how do I properly call the win32 function CreateProfile() from C# (managed code)? I have tried to devise a solution on my own with no avail. The syntax for CreateProfile() is: HRESULT WINAPI CreateProfile( __in LPCWSTR pszUserSid, __in LPCWSTR pszUserName, __out LPWSTR pszProfilePath, __in DWORD cchProfilePath ); The supporting documents can be found in the MSDN library. The code I have so far is posted below. DLL Import: [DllImport("userenv.dll", CharSet = CharSet

问题 we use a self-written 32bit C++ DLL from our C# applications. Now we've noticed that when the C# applications are run on a 64bit system, the 64bit runtime is automatically used and of course the 32bit DLL can not be accessed from the 64bit runtime. My question is: is there a way of using the 32bit DLL? If not, if I created a 64bit version of the DLL, would it be easily possible to let the application choose which one to P/Invoke to? I'm thinking of creating two helper classes in C#: One that

问题 I thought that a delegate instance was interchangeable with a function instance. Take the following code: delegate int AddDelegate(int a, int b); AddDelegate DelegateInstance; public void DoStuff() { //I can call this without a delegate "instance": MethodThatTakesAdd(Add); //I can also call it WITH a delegate "instance" DelegateInstance = Add; MethodThatTakesAdd(DelegateInstance); } public int Add(int a, int b) { return a + b; } public void MethodThatTakesAdd(AddDelegate addFunction) {

问题 I have a c library that has cdecl callbacks. How can I use these from c#. Everything seems to say that they must be stdcall callbacks to be clear: delegate int del(); [dllimport("mylib.dll",CallingConvention=CallingConvention.Cdecl)] public static extern int funcwithcallback(del foo); where del must be called cdecl-wise 回答1: Take a look at this. The functionality has been around since 1.1 so it should cover whatever .NET version you are using. You just have to specify the CallingConvention.

问题 First a background question: In general, what is the difference between int and IntPtr ? My guess is that it is an actual object rather than a value like an int or byte is. Assuming that is true: So they are not the same. Yet I see handles represented as both. IntPtr: Control.Handle int (or uint): A PInvoke can be setup to return an int and it works just fine: [DllImport("coredll.dll", SetLastError = true)] public static extern int GetForegroundWindow(); private string GetActiveWindow() {

问题 I am interfacing with code that takes a char** (that is, a pointer to a string): int DoSomething(Whatever* handle, char** error); Basically, it takes a handle to its state, and if something goes wrong, it returns an error code and optionally an error message (the memory is allocated externally and freed with a second function. That part I've figued out :) ). I, however, am unsure how to handle in in C#. What I have currently: [DllImport("mydll.dll", CallingConvention = CallingConvention.Cdecl

问题 I wrote a C++ DLL and now I need to call a native function from a managed app. The exported native function appears like this: extern "C" __declspec(dllexport) bool NativeMethod(char *param1, char *param2, char *result); So, from C# I'll call that function passing 2 input params, 1 output param and obviously I'll read the return bool value. I tried to wrap all this in many ways, but always I get a PInvokeStackImbalance exception. The only way I know to call native function is by applying

问题 I'm trying to marshal a dynamically allocated char array in a struct to C#. The struct has a pointer to the array. The problem is the char array contains multiple null terminated strings and the last string is terminated by two consecutive null chars. If I try to marshal it as LPStr I will get only de first string in the "list". I tried using UnmanagedMemoryStream but it requires to know the length of the array. Is there a way to read the bytes as a stream without knowing the length of the

问题 I had two flock of bird sensor and i have refer to example code #8 in manual, the c++ code is working for me. But i only get one sensor data from the c sharp project. The problem is that in the C# example, bird_data[1] and bird_data[2] appear to have same position data. In the C++ example both bird_data[1] and bird_data[2] have correct data.I get the same position output data from below code. text output in the LBird1X is same LBird2X,LBird1Y is same LBird2Y and LBird1Z is same LBird2Z. Could