这是一个简单的本地 DLL:
本机.h:
#ifdef BUILDING_NATIVE_DLL
#define DLLAPI __declspec(dllexport)
#else
#define DLLAPI __declspec(dllimport)
#endif
class DLLAPI Native
{
public: void f();
};
本机.cpp:
#include "Native.h"
void Native::f()
{
}
建造:
cl /DBUILDING_NATIVE_DLL /LD Native.cpp
...
Creating library Native.lib and object Native.exp
现在我想从C++/CLI应用程序中使用它:
托管.cpp:
#include "Native.h"
int main()
{
Native* native = new Native();
native->f();
}
我可以在CLR 模式 "IJW" 下构建它:
cl /clr Managed.cpp Native.lib
...
/out:Managed.exe
Managed.obj
Native.lib
但不是在CLR 模式下“纯”:
cl /clr:pure Managed.cpp Native.lib
Microsoft (R) C/C++ Optimizing Compiler Version 16.00.40219.01
for Microsoft (R) .NET Framework version 4.00.30319.18047
Copyright (C) Microsoft Corporation. All rights reserved.
Managed.cpp
c:\users\...\Native.h(9) : warning C42
72: 'Native::f' : is marked __declspec(dllimport); must specify native calling c
onvention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::Native' : is marked __declspec(dllimport); must specify native cal
ling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::~Native' : is marked __declspec(dllimport); must specify native ca
lling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::Native' : is marked __declspec(dllimport); must specify native cal
ling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::operator =' : is marked __declspec(dllimport); must specify native
calling convention when importing a function.
Microsoft (R) Incremental Linker Version 10.00.40219.01
Copyright (C) Microsoft Corporation. All rights reserved.
/out:Managed.exe
/clrimagetype:pure
Managed.obj
Native.lib
Managed.obj : error LNK2028: unresolved token (0A000009) "public: void __clrcall
Native::f(void)" (?f@Native@@$$FQAMXXZ) referenced in function "int __clrcall m
ain(void)" (?main@@$$HYMHXZ)
Managed.obj : error LNK2019: unresolved external symbol "public: void __clrcall
Native::f(void)" (?f@Native@@$$FQAMXXZ) referenced in function "int __clrcall ma
in(void)" (?main@@$$HYMHXZ)
Managed.exe : fatal error LNK1120: 2 unresolved externals
因此,似乎破坏构建的是缺少本地调用约定。
事实上,如果我指定它:
#ifdef BUILDING_NATIVE_DLL
#define DLLAPI __declspec(dllexport)
#else
#define DLLAPI __declspec(dllimport)
#endif
class DLLAPI Native
{
public: void __thiscall f();
};
更好:
cl /clr:pure Managed.cpp
Native.lib
Microsoft (R) C/C++ Optimizing Compiler Version 16.00.40219.01
for Microsoft (R) .NET Framework version 4.00.30319.18047
Copyright (C) Microsoft Corporation. All rights reserved.
Managed.cpp
c:\users\...\Native.h(10) : warning C4
272: 'Native::Native' : is marked __declspec(dllimport); must specify native cal
ling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::~Native' : is marked __declspec(dllimport); must specify native ca
lling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::Native' : is marked __declspec(dllimport); must specify native cal
ling convention when importing a function.
c:\users\...\Native.h(10) : warning C4
272: 'Native::operator =' : is marked __declspec(dllimport); must specify native
calling convention when importing a function.
Microsoft (R) Incremental Linker Version 10.00.40219.01
Copyright (C) Microsoft Corporation. All rights reserved.
/out:Managed.exe
/clrimagetype:pure
Managed.obj
Native.lib
但仍然对生成的成员发出警告。
所以这里有问题:
- 是否可以为整个类指定调用约定,生成的成员将从中继承?
- 如果头文件没有指定调用约定并且不能修改如何在CLR 模式下构建“纯”?
谢谢。