C ++和C＃之间的异步通信 [英] Asynchronous communication between C++ and C#
问题描述
我在C ++中有一个控制台应用程序，在加载C＃时加载一个库，反过来，当加载时显示带有几个按钮的模态窗体。
我需要在C＃到C ++中实现一个回调函数，以便在每次以模态形式进行操作时在C ++控制台输出中指示。
当执行C ++应用程序，表单不显示，应用程序在几秒钟（15毫米）后没有答案结束。
如果部分表示为/ /返回调用函数语句被注释（在C＃侧），执行应用程序并显示表单。这表明没有声明它应该在C＃端。
对于我来说，在类似模式的函数中使C ++与C＃融合是全新的表单。
我需要知道如何更正语句，以便识别回调函数。
我尝试了什么：
我已经更正了代码但是当我运行回调函数时它给了我一个ECall安全错误
我已经处理了以下代码C ++：
int wmain（int argc，_TCHAR * argv [如果（hResult == S_OK）{
std :: wcout<< returned_thing<< std :: endl;
返回0;
}
返回1;
}
之前的应用程序使用以下代码与C＃中的库进行通信：＃/>
I have a console application in C++ that when loaded load a library in C#, which, in turn, when loaded shows a modal form with several buttons.
I need to implement a call back function from C# to C++ to indicate, in the C++ console output, every time an action is made in the modal form.
When the C ++ application is executed, the form is not displayed and the application ends without an answer after a few seconds (15 mm).
If the section indicated as //Return call function statement is commented (on C# side), the application is executed and the form is displayed. This indicates that something is not declared as it should be on the C# side.
For me it is totally new to make C++ converge with C# during a modal function like that of the form.
I need to know how to correct the statement so that the callback function is recognized.
What I have tried:
I have corrected the code but when I run the callback function it gives me an ECall security error
I have treated the following code C++:
int wmain(int argc, _TCHAR* argv[]) {
if (hResult == S_OK) {
std::wcout << returned_thing << std::endl;
return 0;
}
return 1;
}
The previous application communicates with the library in C # with the following code C #:
namespace CSharpClass
{
public class The33Class
{
CPPCallBack _CPPCallBack = null;
public void SetCallBacks(IntPtr cppCallBack)
{
}
public String Getng(String arg) // Make sure this is public
{
}
}
}
推荐答案
我在几年前做过类似的事情。一个非常务实的方法（也可能是一个非常脏的方法）。
请记住我在这里注意到我记得的...
c＃部分
I did similar things before some years. A very pragmatic Approach (and maybe also a very dirty one).
Keep in mind I noted here what I remember...
The c# part
public class CSharpCom
{
// c++ Callback stuff
private delegate void CPPCallBack([MarshalAs(UnmanagedType.BStr)] string text);
CPPCallBack _CPPCallBack= null;
// To set callback from c++
public void SetCallBacks(IntPtr cppCallBack)
{
_CPPCallBack= (CPPCallBack)Marshal.GetDelegateForFunctionPointer(
cppCallBack,
typeof(CPPCallBack));
}
// Using of the callback
public void LogMsg(string msg)
{
try
{
_CPPCallBack?.Invoke(msg);
}
catch
{
// Error handling
}
}
// You other COM stuff
}
c ++部分
The c++ part
static void __stdcall CPPCallBack(BSTR msg)
{
// Implement callback stuff here
}
int wmain(int argc, char* argv[])
{
CoInitialize(0); // Init COM
BSTR thing_to_send = ::SysAllocString(L"10 20");
BSTR returned_thing;
CSharpDll::_TheClassPtr obj(__uuidof(CSharpDll::TheClass));
// Register the callback
obj->SetCallBacks((INT64)CPPCallBack);
HRESULT hResult = obj->GetTheThing(thing_to_send, &returned_thing);
if (hResult == S_OK) {
std::wcout << returned_thing << std::endl;
return 0;
}
return 1;
}
我希望它有所帮助
根据OP的反馈调整
代码
I hope it helps
code adjusted according to OP's feedback
控制台必须是C ++的原因吗？这是一个愚蠢的例子，所以你可以在另一个更复杂的环境中工作，比如遗留的C ++应用程序或COM对象吗？
如果没有，那么。 ..
1）为什么不使用也是托管代码的C ++ / CLI？
或
2）你可以用C＃编写一个控制台应用程序。这样可以为您解决问题。
Is there a reason the console has to be in C++? Is this a dumbed-down example so you can get this working in another, more complicated context, like a legacy C++ app or COM object?
If not, then ...
1) Why not use C++/CLI which is also managed code?
or
2) You can write a console app in C#. So that may resolve the issue for you.
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