dllimport

问题 As the title says I need a function in my DLL which I need to call while uninstalling. The DLL is included this way #define myProgData "C:\ProgramData\Foo\Bar" [Files] Source: "mydll.dll"; Flags: dontcopy I already use one function while installing and now I want to know if I can use the same DLL for uninstall or does the DLL have to be copied so the uninstaller can access it? I've tried a simple call already but got the Could not call proc - Exception So I'm looking for the reason for this.

问题 I'm wondering whether anyone has a decent explanation or overview on the negative aspects of using DLLImport / PInvoke on Win32 methods from managed .Net code? I plan to make use of various Win32 methods and would like to have a greater understanding on the negative implications of doing so. Thanks, Brian. 回答1: According to MSDN - Calling Native Functions from Managed Code PInvoke has an overhead of between 10 and 30 x86 instructions per call. In addition to this fixed cost, marshaling

问题 We are writing a code to do on-demand scan of a file from C# using Windows Defender APIs. [DllImport(@"C:\Program Files\Windows Defender\MpClient.dll")] public static extern int WDStatus(out bool pfEnabled); [DllImport(@"C:\Program Files\Windows Defender\MpClient.dll")] public static extern int MpManagerOpen(uint dwReserved, out IntPtr phMpHandle); [DllImport(@"C:\Program Files\Windows Defender\MpClient.dll")] public static extern int MpScanStart(IntPtr hMpHandle, uint ScanType, uint

问题 I seem to be able to use __declspec(dllexport) and __declspec(dllimport) interchangeably when building my dll in Visual Studio 2015. I would have thought when making the DLL that the dllexport command would have been required but it seems either dllexport or dllimport is adequate.I have the following header file declaring a simple add() functions: add.h #pragma once #ifdef ADDDLL_EXPORTS #define ADDDLL_API __declspec(dllexport) #else #define ADDDLL_API __declspec(dllimport) #endif ADDDLL_API

问题 Here is a sample of my C# code. Is there a way to decrease the amount of DllImport attributes? namespace CSLib { class Program { static void Main(string[] args) { CLib.test(); CLib.test2(3); A a = new A() { a = 9, b = 5 }; CLib.test3(ref a); } } class CLib { [DllImport("path/to/CDLL", CallingConvention = CallingConvention.Cdecl)] public static extern void test(); [DllImport("path/to/CDLL", CallingConvention = CallingConvention.Cdecl)] public static extern void test2(int a); [DllImport("path

问题 An import error occurs when trying to run jupyter notebook I'm trying to run jupyter notebook using anaconda ( git bash platform), and as I type in jupyter notebook, an import error occurs every time. I tried to lauch it inside an environment, but the same error occured. $ jupyter notebook Traceback (most recent call last): File "C:\Users\User\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module> from notebook.notebookapp import main File "C:\Users\User\Anaconda3\lib\site

问题 An import error occurs when trying to run jupyter notebook I'm trying to run jupyter notebook using anaconda ( git bash platform), and as I type in jupyter notebook, an import error occurs every time. I tried to lauch it inside an environment, but the same error occured. $ jupyter notebook Traceback (most recent call last): File "C:\Users\User\Anaconda3\Scripts\jupyter-notebook-script.py", line 6, in <module> from notebook.notebookapp import main File "C:\Users\User\Anaconda3\lib\site

问题 I have a dll of the LZ4 c implementation and I want to call the LZ4_compress_default(const char* source,char* dest,int sourceLength,int maxdestLength); function from a c# code. The function compresses the source array into the dest array. How to do this? My C# code: DllImport(@"CXX.dll", CharSet = CharSet.Ansi, SetLastError = true, CallingConvention = CallingConvention.Cdecl)] internal static extern int LZ4_compress_default( [MarshalAs(UnmanagedType.LPArray)] char[] source, out byte[] dest,

问题 i am having trouble importing c++ unmanaged dll into C# [winform]. Can someone help? Basically i am just trying to create a safearray of strings in c++ and trying to send it to C#. Here is my c++ code. extern "C" __declspec(dllexport) BOOL GetStringArr(SAFEARRAY* arr) { SAFEARRAY* myArray; SAFEARRAYBOUND rgsabound[1]; rgsabound[0].lLbound = 0; rgsabound[0].cElements = 5; myArray = SafeArrayCreate(VT_BSTR, 1, rgsabound); VARIANT* pvData = (VARIANT*)(myArray->pvData); pvData[0].vt = VT_BSTR;

问题 How would I prevent an import lib from loading the DLL it refers to at runtime until I call something like, say, LoadLibrary ? 回答1: Maybe you need this: http://www.west-wind.com/weblog/posts/2007/Dec/02/Delay-Loading-a-DLL-with-a-Linker-Switch-in-Visual-Studio http://www.codeproject.com/Articles/273419/Dynamic-Libraries-with-Delayed-Function-Loading 来源： https://stackoverflow.com/questions/12685664/prevent-lib-from-loading-dll-at-runtime