如何使com0com虚拟端口显示为真实物理端口并被特定应用识别

Absolutely, you can reconfigure com0com’s virtual ports to appear in the Ports (COM & LPT) category in Device Manager, which should make your legacy application (that only detects "USB Serial Virtual Ports") recognize them. Since com0com is open-source, we can tweak its driver settings without relying on closed-source tools like HHD Software’s virtual ports. Here are two step-by-step methods:

Method 1: Modify com0com’s INF File (Permanent Driver Change) #

This method alters the com0com driver itself so all future port pairs default to the COM/LPT category:

1. Uninstall existing com0com ports: Open Device Manager, expand the com0com category, right-click each port, select Uninstall device, and check "Delete the driver software for this device" before confirming.
2. Locate the setup.inf file: Navigate to your com0com installation directory (usually C:\Program Files (x86)\com0com) and open setup.inf with a text editor (e.g., Notepad, VS Code).
3. Update device class settings:
   • In the [Version] section, change Class=com0com to Class=Ports.
   • Find the line starting with ClassGUID= (usually in the [com0com.NT] or [com0com.NT.Services] section) and replace the existing GUID with the COM/LPT category GUID: {4D36E978-E325-11CE-BFC1-08002BE10318}.
4. Reinstall the driver: Right-click the modified setup.inf file and select Install.
5. Create new port pairs: Run setupc.exe from the com0com directory to create your desired virtual port pairs. Now check Device Manager—they’ll appear under Ports (COM & LPT).

Method 2: Reclassify Existing Ports with DevCon (No Reinstall Needed) #

If you don’t want to modify the driver permanently, use Microsoft’s DevCon tool to reclassify existing com0com ports:

1. Get the device’s hardware ID: Open Device Manager, right-click your com0com port, go to Properties > Details > Hardware IDs, and copy the value (e.g., ROOT\COM0COM\0000).
2. Use DevCon to change the class:
   • Download DevCon (included in the Windows SDK Command Prompt).
   • Open an elevated Command Prompt (Run as Administrator).
   • Run this command to reclassify the device:

     devcon classchange "ROOT\COM0COM\0000" -class "{4D36E978-E325-11CE-BFC1-08002BE10318}"
     

   • Replace the hardware ID in quotes with the one you copied earlier.
3. Refresh Device Manager: The port will now move to the Ports (COM & LPT) category.

Bonus: Adjust Friendly Name (If Needed) #

Some applications check the port’s friendly name instead of its category. If the app still doesn’t detect the port, rename it to match "USB Serial Virtual Ports":

1. Open regedit (Registry Editor) and navigate to:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ROOT\COM0COM\[Your Port Instance ID]\Device Parameters
   

2. Find the FriendlyName string value, double-click it, and set its data to USB Serial Virtual Port.
3. Restart your application—it should now recognize the com0com port.

内容的提问来源于stack exchange，提问作者hkoosha