在C ++文件中使用串口对象

问题描述

您好，



我正在编写一个C ++应用程序来向串口发送数据。当我尝试创建一个包含所有命令的文件并将其链接到我的主文件时，我的问题出现了。我需要访问我的主要表单Communicate.h中定义的serialport1对象（我将范围从私有更改为公共）：

Hi there,

I am writing a C++ application to send data down a serial port. My problem arises when I attempt to create a file with all my commands in and link that to my main file. I need to access the serialport1 object defined here in my main form "Communicate.h" (I changed the scope from private to public):

public: System::IO::Ports::SerialPort^  serialPort1;

我需要在Commands.cpp中访问它我试试这样：

I need to access this in Commands.cpp I try it like this:

#include "Commands.h"
#include "Communicate.h"

using namespace SerialCommunications;
using namespace System;
using namespace System::IO::Ports;

void elbow(int dir, int amt)
{
    array<Byte>^ cmd = { 0xff, 0xff, 0xff };
    Communicate::serialPort1->Write(cmd, 0, 3);
}

但是我刚收到此错误信息试图访问它：



错误：非静态成员引用必须与特定对象相关



提前致谢!!

Max

However I just get this error message trying to access it:

"Error: a nonstatic member reference must be relative to a specific object"

Thanks in advance!!
Max

推荐答案

// Create a new SerialPort object with default settings.
serialPort1 = gcnew System::IO::Ports::SerialPort();

请参考此处的示例：



[]



也许将声明移到类中并将其实例化构造函数。





没有你的代码我不知道。首先也是最重要的是我会问你为什么使用C ++ / clr而不是C＃。

这是一个简单的例子，它只是向你展示机制。



communic.h

Refer to the example here:

https://msdn.microsoft.com/en-us/library/system.io.ports.serialport(v=vs.110).aspx?cs-save-lang=1&cs-lang=cpp#code-snippet-1[^]

Maybe move the declaration to the class and instantiate it in the constructor.


Without your code I have no idea. First and most importantly I would ask why you are using C++/clr and not C#.
Here is a simple example JUST to show you the mechanism.

communicate.h

using <System.dll>

using namespace System;
using namespace System::IO::Ports;

namespace SerialCommunications
{
	ref class communicate
	{
	public:
		communicate(void)
		{
			// Create a new SerialPort object with default settings.
			serialPort1 = gcnew SerialPort();
		};

	private:
		SerialPort^ serialPort1;
	public:

		void Write(array<unsigned char> ^ buffer, int offset, int count)
		{
			serialPort1->Write(buffer, offset, count);
		}
	};
}

然后

then

/ testclr.cpp : main project file.

#include "stdafx.h"
#include "communicate.h"

using namespace System;
using namespace SerialCommunications;

int main(array<System::String ^> ^args)
{
    communicate^ myCommunicate = gcnew communicate();

    array<Byte>^ cmd = gcnew array<Byte>{ 0xff, 0xff, 0xff };
    myCommunicate->Write(cmd, 0, 3);


    return 0;
}

public: System::IO::Ports::SerialPort^  serialPort1;

to：

to:

public: static System::IO::Ports::SerialPort^  serialPort1;

非常感谢，

Max

Thank you very much,
Max

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