dllimport

问题 I am trying to use a third party DLL that wants an int** as one of the parameters to the method. It describes the parameter as the address of the pointer that will point to the memory allocation. Sorry for any confusion. The parameter is two-way I think. The DLL is for talking to an FPGA board and the method is setting up DMA transfer between the host PC and the PCI board. 回答1: Use a by-ref System.IntPtr. [DllImport("thirdparty.dll")] static extern long ThirdPartyFunction(ref IntPtr arg);

问题 I am trying to use a third party DLL that wants an int** as one of the parameters to the method. It describes the parameter as the address of the pointer that will point to the memory allocation. Sorry for any confusion. The parameter is two-way I think. The DLL is for talking to an FPGA board and the method is setting up DMA transfer between the host PC and the PCI board. 回答1: Use a by-ref System.IntPtr. [DllImport("thirdparty.dll")] static extern long ThirdPartyFunction(ref IntPtr arg);

问题 I am trying to use a third party DLL that wants an int** as one of the parameters to the method. It describes the parameter as the address of the pointer that will point to the memory allocation. Sorry for any confusion. The parameter is two-way I think. The DLL is for talking to an FPGA board and the method is setting up DMA transfer between the host PC and the PCI board. 回答1: Use a by-ref System.IntPtr. [DllImport("thirdparty.dll")] static extern long ThirdPartyFunction(ref IntPtr arg);

问题 A .NET application calls C dll. The C code allocates memory for a char array and returns this array as result. The .NET applications gets this result as a string. The C code: extern "C" __declspec(dllexport) char* __cdecl Run() { char* result = (char*)malloc(100 * sizeof(char)); // fill the array with data return result; } The C# code: [DllImport("Unmanaged.dll")] private static extern string Run(); ... string result = Run(); // do something useful with the result and than leave it out of

问题 I was re-reading through some .Net documentation today when I noticed that the first portion of the extern keywords documentation claims: The extern modifier is used to declare a method that is implemented externally. A common use of the extern modifier is with the DllImport attribute when you are using Interop services to call into unmanaged code. What caught my attention was that the document states that "a common use" of extern is that it is used with the DllImport attribute. This implies

问题 How does one include in a c/c++ unmanaged code dll, consumed using v2 .net core compatible DllImportAttribute statements, in azure functions publish process? I've confirmed it works in cloud deployment by manually copying, via azure storage explorer, to functions app storage account | file shares | | site/wwwroot/bin folder. Issue is now I haven't been able to find way to have it included in vs17 | | Publish process. Tried placing dll in \bin\$(Configuration)\netcoreapp2.1\bin folder before

问题 I'm trying to access an unmanaged library and am lucky to have access to a comprehensive guide to the API. Unfortunately, I've no idea what the C# equivalent of C++'s WORD type is. Similarly, I've no idea what DWORD would be. 回答1: You're probably looking for ushort for WORD and uint for DWORD. 来源： https://stackoverflow.com/questions/5490428/whats-the-equivalent-of-word-in-c

问题 After googling, i came to know that Dllimport makes the function available for other modules, is it mandatory to declare function with extern "c" identifier? Also, Dllexport means, Dll itself uses the function while compiling it says. so by default all functions present in DLL are dllexport? 回答1: __declspec(dllexport) exports a symbol. It makes it available from outside a DLL. __declspec(dllimport) imports a symbol. It practically says "this symbol is not defined in this application, it needs

问题 The respected open source .NET wrapper implementation (SharpBITS) of Windows BITS services fails identifying the underlying BITS version under Win7 x64. Here is the source code that fails. NativeMethods are native Win32 calls wrapped by .NET methods and decorated via DllImport attribute. private static BitsVersion GetBitsVersion() { try { string fileName = Path.Combine( System.Environment.SystemDirectory, "qmgr.dll"); int handle = 0; int size = NativeMethods.GetFileVersionInfoSize(fileName,

问题 I'm new on windows phone developement and i have one problem that i don't know how to resolve.... the problem is.... i have a c++ project that i had complided with visual c++ 2010 and this create one dll with code compiled... so i know that C# import dll libraries but when i add refrences it's make this error "Unable to retrieve assembly fullname ""Parameter name: AssemblyPath" and i dont kown what it means... I searched on google and i found one method to import c++ dll manualy with