VC6 MSCOMM控件串口编程
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**串口编程是计算机通信领域中的重要组成部分,尤其是在嵌入式系统、自动化设备以及工业控制等领域广泛应用。在Microsoft Visual C++ 6.0(简称VC6)中,开发者可以使用MSComm控件来实现串口通信功能。MSComm控件为用户提供了方便的API接口,使得串口操作变得相对简单。** ### 一、MSComm控件介绍 MSComm控件是Windows操作系统提供的一个ActiveX控件,用于处理串行通信。它提供了丰富的属性、事件和方法,以支持串行端口的打开、关闭、读写数据、设置波特率、校验位、数据位、停止位等操作。通过在VC6的用户界面中添加MSComm控件,开发者可以直接在代码中进行串口编程。 ### 二、MSComm控件的主要属性 1. **CommPort**: 设置或获取与控件关联的串口号,如CommPort = 1表示COM1。 2. **Settings**: 设置串口的通信参数,如波特率、数据位、停止位和校验位,格式如"9600,N,8,1"。 3. **Input**: 获取串口接收缓冲区中的数据。 4. **Output**: 设置要发送到串口的数据。 5. **PortOpen**: 控制串口的打开和关闭状态,设置为True表示打开串口,False表示关闭串口。 6. **RThreshold**: 设置输入缓冲区达到多少字节时触发OnComm事件。 ### 三、MSComm控件的主要事件 1. **OnComm**: 当串口发生通信事件时触发,如接收到数据、发生错误或通信端口状态改变。 2. **CommEvent**: 事件参数,指示发生了哪种通信事件,如CE_RXCHAR表示接收到字符,CE_RXTO表示超时,CE_OVERRUN表示溢出等。 3. **LineStatus**: 返回当前串口的状态信息,如LS_RLSD(数据准备好)、LS_OVERRUN(溢出错误)等。 ### 四、MSComm控件的主要方法 1. **SetInput**: 设置输入缓冲区的处理方式,如使用GetInput获取数据或使用InputMode控制数据格式。 2. **ClearInput**: 清空输入缓冲区。 3. **ClearOutput**: 清空输出缓冲区。 4. **GetCommState**: 获取当前的通信状态设置。 5. **SetCommState**: 设置通信状态,如波特率、校验位等。 ### 五、使用MSComm控件的基本步骤 1. 添加MSComm控件到界面:在VC6的工具箱中找到MSComm控件,将其拖放到窗体上。 2. 配置串口设置:通过设置`MSComm1.Settings`属性配置波特率、数据位、停止位和校验位。 3. 打开串口:`MSComm1.PortOpen = True`。 4. 读写数据:使用`MSComm1.Input`读取数据,`MSComm1.Output`发送数据。 5. 监听事件:在事件处理程序中编写针对OnComm事件的代码,处理通信过程中的各种情况。 6. 关闭串口:在适当的时候执行`MSComm1.PortOpen = False`。 ### 六、示例代码 ```cpp void CSampleDlg::OnInitDialog() { CDialog::OnInitDialog(); // 初始化MSComm控件 m_MSComm.SetCommPort(1); // 设置串口号 m_MSComm.SetSettings("9600,N,8,1"); // 设置波特率、数据位、停止位、校验位 m_MSComm.SetPortOpen(true); // 打开串口 // 注册OnComm事件 m_MSComm.m_EventMask = EV_RXCHAR; // 只监听接收到字符的事件 } void CSampleDlg::OnComm() { if (m_MSComm.CommEvent == CE_RXCHAR) // 接收到字符 { CString data; data = m_MSComm.Input; // 获取接收到的数据 // 在此处处理接收到的数据 } } void CSampleDlg::OnClose() { m_MSComm.SetPortOpen(false); // 关闭串口 CDialog::OnClose(); } ``` 这个例子展示了如何在VC6中使用MSComm控件进行基本的串口通信操作。通过CnComm文件,你可以找到更详细的示例代码和使用指南,进一步学习和实践串口编程技术。
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