如何将DateTime从C ++发送到C＃端 [英] How to send DateTime from C++ to C# side

问题描述

嗨朋友们，



有人能告诉我如何将日期时间从C ++端发送到C＃端。在C＃方面，我使用日期时间如下：

Hi friends,

Can somebody tell me that how to sent date-time from C++ side to C# side. On C# side I used date-time as follows:

void WriteTextAppLog(DateTime dt, LogLevel level, string msgHeader, string msgDetails);

现在我想以上述格式从C ++端向C＃端发送日期时间。



我使用的是vc ++ 2005。 br />


请帮我解决这个问题。



谢谢

Now I want to sent date-time from C++ side to C# side in the form of above format.

I am using vc++ 2005.

Please help me to resolve this.

Thanks

推荐答案

由于C＃与C ++ / CLI的问题很简单，我可以假设你在谈论本机（非托管）C ++项目。



As System.DataTime 是一个CLI结构，您不能在非托管代码中使用它的引用。您必须使用Windows日期时间结构，将其传递给托管代码，并在CLI端将其转换为 System.DataTime （在C＃中）。



特别是，您可以使用Windows FILETIME ：

http://msdn.microsoft.com/en-us/library/windows/desktop/ms724284 ％28v = vs.85％29.aspx [ ^ ]。



如您所见，这是一个64位整数值由两个32位值组成的记录。您可以将它传递给C＃，并转换为一个64位值（你知道怎么做？）。它会以100 ns的间隔给你时间。使用此值可以使用以下构造函数之一初始化 DataTime 值：

http://msdn.microsoft.com/en-us/library/z2xf7zzk.aspx [ ^ ]，

http://msdn.microsoft.com/en-us/library/w0d47c9c.aspx [ ^ ]。



更高级的方式将使用自定义参数编组，这仍然在CLI端（C＃）完成，并且基本上也会这样做。要了解相关信息，请参阅：

http： //msdn.microsoft.com/en-us/library/system.runtime.interopservices.icustommarshaler.aspx [ ^ ]。



我希望你知道你可以使用P / Invoke导入本机C ++函数并知道如何。如果没有，请参阅：

http://en.wikipedia.org/wiki/Platform_Invocation_Services [ ^ ]，

< a href =http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices.asp> http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices .asp [ ^ ]。



此CodeProject文章也很有用： Essential P / Invoke [ ^ ]。

-SA

As the problem is trivial for C# vs C++/CLI, I can assume that you are talking about native (unmanaged) C++ project.

As System.DataTime is a CLI structure, you cannot use its reference in unmanaged code. You have to use Windows date-time structure, pass it to managed code, and convert it to System.DataTime on the CLI side (in C#).

In particular, you can use Windows FILETIME:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms724284%28v=vs.85%29.aspx[^].

As you can see, this is a 64-bit integer value composed as a record of two 32-bit values. You can pass it to C#, and convert to one 64-bit value (do you know how?). It will give you the time in 100-ns intervals. Use this value to initialize DataTime value using one of these constructors:
http://msdn.microsoft.com/en-us/library/z2xf7zzk.aspx[^],
http://msdn.microsoft.com/en-us/library/w0d47c9c.aspx[^].

A more advanced way would be using customizing parameter marshalling, which is still done on the CLI side (C#) and would essentially do the same. To get an idea, please see:
http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.icustommarshaler.aspx[^].

I hope you know that you can import native C++ function using P/Invoke and know how. If not, please refer to:
http://en.wikipedia.org/wiki/Platform_Invocation_Services[^],
http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices.asp[^].

This CodeProject article can also be useful: Essential P/Invoke[^].

—SA

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