在Windows 7上连接到高于10的COM端口时，句柄错误无效 [英] Invalid handle error when connecting to COM port higher than 10 on Windows 7

问题描述

我开发了一个简单的串口应用程序，它可以在低于10的COM端口（COM9，COM8，... COM1）下正常工作。但是当我的设备连接在高于10的端口，如COM11，它不连接，我得到一个INVALID_HANDLE。我的代码是：

I have developed a simple serial port application that works fine with COM ports lower than 10 (COM9, COM8, ... COM1). But when my device is attached on a port higher than 10, such as COM11, it doesn't connect and I get an INVALID_HANDLE. My code is:

comport = CreateFileA(comPortName.toAscii(), GENERIC_READ|GENERIC_WRITE,
                      FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

if(comport == INVALID_HANDLE_VALUE)
{
    //Write exception code here
    connectionStatus = CONNECTION_STATUS_DISCONNECTED;
}

我的代码有什么问题？有没有解决方案？

What's wrong with my code? Is there any solution?

推荐答案

要到达COM端口> = 10，可以使用驱动程序符号链接。例如对于COM10，它是\\.\COM10

To reach the COM Ports >= 10 you can use the drivers symbolic link. For example for COM10 it is \\.\COM10

只需尝试：

comport = CreateFileA("\\\\.\\COM10", GENERIC_READ|GENERIC_WRITE,
                  FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

if(comport == INVALID_HANDLE_VALUE)
{
    //Write exception code here
    connectionStatus = CONNECTION_STATUS_DISCONNECTED;
}

这当然也适用于COM Ports< 10。

Of course, this works also for COM Ports < 10.

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