Delphi中使用SetupDiGetClassDevs进行串口枚举 [英] Serial port enumeration in Delphi using SetupDiGetClassDevs

问题描述

我正在尝试枚举COM端口的友好名称。由于USB串行设备在运行时连接和断开，端口可能会动态更改。

根据，我试图使用SetupDiGetClassDevs方法。

我发现此示例代码，但它是为较早版本的setupapi单元编写的（原始链接到homeepages.borland.com当然不起作用）。

我尝试使用当前JVCL中的setupapi单元（ JVCL340CompleteJCL221-Build3845 ），但它似乎不兼容Delphi 7.我得到编译错误：

 如果SetupDiGetDeviceRegistryProperty（DevInfoHandle，DeviceInfoData，
 RegProperty，
 @PropertyRegDataType，
 @ S1 [1]，RequiredSize， @RequiredSize）然后开始
  

在调用函数 SetupDiGetDeviceRegistryProperty 时，
在参数 @PropertyRegDataType 和 @RequiredSize 之间得到错误实际和形式参数的类型必须相同。

Delphi3000站点说，代码是在2004年写的，适用于Delphi 7，所以我不知道为什么它现在不适用于Delphi 7，除非setupapi已经改变。有人熟悉setupapi的更改可能会导致这些问题吗？

我正在使用简单的控制台程序进行测试。用法语句是windows，
sysutils，
类，
setupAPI，
Registry;

主程序是：

  begin 
 ComPortStringList：= SetupEnumAvailableComPorts; 
 for Index：= 0 to ComPortStringList.Count  -  1 do 
 writeln（ComPortStringList [Index]）; 
结束
结束。 
  

解决方案

看起来像一些参数类型 SetupApi.pas 中替换为 var DWord 的PDWord 。所有你需要的是从你的代码中的这些参数中删除'@'：

 如果SetupDiGetDeviceRegistryProperty（DevInfoHandle，DeviceInfoData，
 RegProperty，
 PropertyRegDataType，
 @ S1 [1]，RequiredSize，RequiredSize）然后开始
  

I'm trying to enumerate "friendly names" for COM ports. The ports may dynamically change as USB-serial devices are connected and disconnected at runtime.

Based on the possible methods described in this question, I am attempting to use the SetupDiGetClassDevs method.

I found this example code, but it is written for an older version of the setupapi unit (the original link to homepages.borland.com doesn't work of course).

I tried using the setupapi unit from the current JVCL(JVCL340CompleteJCL221-Build3845), but it doesn't seem to be compatible with Delphi 7. I get compiler errors:

if SetupDiGetDeviceRegistryProperty(DevInfoHandle,DeviceInfoData,
    RegProperty,
    @PropertyRegDataType,
    @S1[1],RequiredSize,@RequiredSize) then begin

In the call to function SetupDiGetDeviceRegistryProperty, I get the error "Types of actual and formal parameters must be identical" on the parameters @PropertyRegDataType, and @RequiredSize.

The Delphi3000 site says the code was written in 2004 and is intended for Delphi 7, so I'm not sure why it doesn't work with Delphi 7 now, unless setupapi has changed. Is anyone familiar with the changes to setupapi that could cause these problems?

I'm testing with a simple console program. The uses statement is " windows, sysutils, classes, setupAPI, Registry;"

The main program is:

  begin
  ComPortStringList := SetupEnumAvailableComPorts;
  for Index := 0 to ComPortStringList.Count - 1 do
      writeln(ComPortStringList[Index]);
  end;
  end.

解决方案

Looks like some arguments of type PDWord were replaced by var DWord in SetupApi.pas. All you need is to remove '@' from these arguments in your code like that:

if SetupDiGetDeviceRegistryProperty(DevInfoHandle,DeviceInfoData,
                                    RegProperty,
                                    PropertyRegDataType,
                                    @S1[1],RequiredSize,RequiredSize) then begin

这篇关于Delphi中使用SetupDiGetClassDevs进行串口枚举的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！