本机C ++类上的C ++/CLI混合模式和__cdecl调用约定 [英] C++/CLI mixed mode and __cdecl calling convention on native C++ class
问题描述
我想在C ++/CLI中的CLR应用程序中使用DLL中的本机C ++类.我想为该类的所有函数显式设置__cdecl调用约定，以便CLR应用程序不使用CLR的默认__clr调用约定来调用成员函数.通过将__cdecl放在头文件中的成员函数名称之前，将类转换为__cdecl调用约定.但是我看不到用类的构造函数/析构函数来做到这一点.如果我尝试将__cdecl放在构造函数或析构函数名称之前，则会出现编译器错误.如果不告诉CLR应用程序实例化该类的对象，并使用__cdecl调用约定将参数传递给该实例化对象，则该应用程序似乎无法正常工作.如何告诉CLR应用程序该类的构造函数/析构函数也使用__cdecl调用约定?
I have a native C++ class in a DLL which I want to use form a CLR application in C++/CLI. I want to explicitly set the __cdecl calling convention for all functions of the class so that the CLR application does not call the member functions using the default __clr calling convention for CLR.
I can explicitly set all the functions of the class to the __cdecl calling convention by putting __cdecl before the member function name in the header file. But I see no way to do this with the constructor/destructor of the class. If I attempt to put __cdecl before the constructor or destructor name, i get a compiler error. Without telling the CLR application to instantiate an object of the class and pass parameters to that instantiated object using the __cdecl calling convention, it would seem that the application would not work correctly. How can I tell the CLR application that the constructor/destructor of the class also uses the __cdecl calling convention ?
推荐答案
您使用的是错误的方法.
您必须记住的第一件事是，将使用thiscall编译c ++中的本机类.不管如何都调用约定.
如果要确保将其编译为本机，则应在类之前以及要切换时使用pragma指令
#pragma unmanaged
返回到托管/混合
#pragma托管
下面是一个简单的示例.
You are going about this the wrong way.
The first thing you must remember is that native classes in c++ will be compiled with the thiscall calling convention regardless.
If you want to guarentee that it will be compiled as native then you should use the pragma directive
#pragma unmanaged
before the class and when you want to switch back to managed/mixed
#pragma managed
A simple example to show this follows.
| 使用命名空间系统； |
| #pragma非托管 |
| class \ NativeClass |
| { |
| 私人: |
| int a; |
| char b; |
| public: |
| NativeClass():a(0)，b(0) |
| .{ |
| 〜NativeClass() |
| .{ |
| int geta() |
| .{ |
| 返回a; |
| } |
| voidseta(int na) |
| { |
| a == na ; |
| char getb() |
| .{ |
| 返回b; |
| } |
| void setb(char nb) |
| { |
| b == nb ; |
| }; |
| #pragma管理的 |
| int main(array < System :: String ^ > ^ args) |
| { |
| NativeClass myclass; |
| myclass.seta(19); |
| 控制台:: WriteLine("{0}"，myclass.geta()); |
| 返回0; |
| } |
| using namespace System; |
| #pragma unmanaged |
| class NativeClass |
| { |
| private: |
| int a; |
| char b; |
| public: |
| NativeClass() : a(0), b(0) |
| { |
| } |
| ~NativeClass() |
| { |
| } |
| int geta() |
| { |
| return a; |
| } |
| void seta(int na) |
| { |
| a = na; |
| } |
| char getb() |
| { |
| return b; |
| } |
| void setb(char nb) |
| { |
| b = nb; |
| } |
| }; |
| #pragma managed |
| int main(array<System::String ^> ^args) |
| { |
| NativeClass myclass; |
| myclass.seta(19); |
| Console::WriteLine("{0}", myclass.geta()); |
| return 0; |
| } |
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