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Problem in double.Parse in Managed C++

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问题 I am getting a weird problem while parsing a double value in managed C++. It may be that I am doing something wrong. When I do: double value = 0.006; result = Math::Parse( value) The output of result is 0.006000000000001 . Why it is appending a 1? Also when I go an round the value to 5 decimal places, it fails. I am doing: result2 = Math::Round(result, 5) But result2 is always 0.006000000000001 . What am I doing wrong? 回答1: It is normal. This problem caused by IEEE format of double - in real

Generic Generics in Managed C++

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问题 I want to create a List of KeyValuePair s in a managed C++ project. Here is the syntax I'm using List<KeyValuePair<String^, String^>^>^ thing; but I'm getting the following error: error C3225: generic type argument for 'T' cannot be 'System::Collections::Generic::KeyValuePair ^', it must be a value type or a handle to a reference type I basically want to do this (C#) List<KeyValuePair<string, string>> thing; but in managed C++. Oh and in .Net 2.0. Any takers? 回答1: KeyValuePair does not itself

I get LNK2028 when trying to wrap native c++ class using managed c++

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问题 trying to wrap a native cpp class using managed c++ class. all looks good but for some reason it wont compile. getting the following linker errors: Error 25 error LNK2028: unresolved token (0A0002CE) Error 27 error LNK2019: unresolved external symbol Any ideas how do I fix this one ? :\ well, here is a full error of one of the functions: Error 20 error LNK2028: unresolved token (0A0002CF) "public: bool __thiscall RCSclient::ResumeChannel(char *,int,__int64)" (?ResumeChannel@RCSclient@@$$FQAE

C++/CLI : Why can't I pass Strings by reference?

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问题 Why doesn't Microsoft's C++/CLI allow me to pass strings by reference? I received the following error: C3699: '&': cannot use this indirection on type 'System::String' 回答1: Sounds like you are using Managed C++, which is a bastardised C++ used with the .NET Framework. in Managed C++, I believe the syntax you are looking for is System::String^ . The reason for this is that since managed types are garbage collected by .NET Framework, you aren't allowed to create 'regular' references since the

Convert from int to int32

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问题 I have a bunch of int's in my c++ code that I need to change to int32's. Same with my bool's. What header do I need to include in order to use int32's and bool32's. Also how do I declare these once I make them. Am I able to just replace the int's with int32's? For example: int x; Becomes int32 x; I am getting lots of errors when I try to change from int to int32. Here's a few: error C4430: missing type specifier - int assumed. Note: C++ does not support default-int error C2086: 'const int x'

Loading mixed mode assembly from unmanaged code

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问题 As the title says i want to call a mixed mode assembly from unmanaged code. To be more precise, i want to load the mixed mode assembly dynamically and then execute some static unmanaged startup code that registers some Managed C++ Wrappers for C# Code. Is this possible (or do i need to embed the .Net Runtime or use COM?) ? Has anybody already done this and can share some experience? PS: If the mixed mode assembly contains a WPF Window will it be started? 回答1: You need to get the CLR loaded

Arrays of strings in Managed C++

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问题 I'm trying to write an application in Managed C++, but I cannot work out how to declare an array of strings. String^ linet[]; throws an error 'System::String ^' : a native array cannot contain this managed type So I suppose there's a different way to do this for managed data types. What exactly is it? 回答1: Do you really mean Managed C++? Not C++/CLI? Assuming you're actually using C++/CLI (because of the error message you posted), there are two ways to do this: array<String^>^ managedArray =

Managed C++ and AnyCPU

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问题 I have a Managed C++ dll that I am referencing from a C# project. The C# project will be compiled as AnyCPU. Is there any way to compile a 32-bit and 64-bit version of the Managed C++ dll and then tell the C# project at runtime to load the correct one depending on which architecture it is being run? 回答1: The trick to getting the AnyCPU dll to play with the C++ dll, is at runtime make sure the assembly cannot load the C++ dll and then subscribe to the AppDomain AssemblyResolve event. When the

Loading mixed mode assembly from unmanaged code

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As the title says i want to call a mixed mode assembly from unmanaged code. To be more precise, i want to load the mixed mode assembly dynamically and then execute some static unmanaged startup code that registers some Managed C++ Wrappers for C# Code. Is this possible (or do i need to embed the .Net Runtime or use COM?) ? Has anybody already done this and can share some experience? PS: If the mixed mode assembly contains a WPF Window will it be started? You need to get the CLR loaded and initialized. Yes, making a managed class [ComVisible] or hosting the CLR yourself with CorBindToRuntimeEx(

_CRT_DEBUGGER_HOOK throws exception

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I'm having a problem converting my program from VS2005 to VS2008. When I run the program in VS2008, the application starts up fine but when start playing around with the application it crashes giving me this error: "Microsoft Visual Studio C Runtime Library has detected a fatal error" And then the debugger points me to this function: __declspec(noinline) void __cdecl _CRT_DEBUGGER_HOOK(int _Reserved) { /* assign 0 to _debugger_hook_dummy so that the function is not folded in retail */ (_Reserved); _debugger_hook_dummy = 0; } compiling the application ase release works prefectly... By the way,