Windows利用Pdh读取机器的磁盘，网络，CPU等信息
在Windows操作系统中，开发人员可以使用Performance Data Helper（Pdh）库来监控系统的各种性能指标，如磁盘使用情况、网络流量、IO读写速率以及CPU使用率等。Pdh是一个强大的API，允许C++程序员，尤其是使用MFC（Microsoft Foundation Classes）框架的开发者，以编程方式获取这些关键信息。本项目名为"ServerMonitor"，显然它是一个用于实时监控服务器性能的应用程序。
我们要理解Pdh的基本用法。Pdh API提供了`PdhOpenQuery`函数来创建一个查询对象，它是收集性能数据的基础。接着，我们可以使用`PdhAddCounter`添加我们感兴趣的计数器，比如"\PhysicalDisk(_Total)\% Disk Time"来获取所有磁盘的平均使用时间，或者"\Network Interface(*)\Bytes Total/Sec"来监控网络接口的总流量。每个计数器都代表一个特定的性能指标。
对于磁盘性能监控，Pdh可以提供如"\LogicalDisk(_Total)\% Disk Time"（磁盘时间百分比）、"\LogicalDisk(_Total)\% Disk Read Time"和"\LogicalDisk(_Total)\% Disk Write Time"（分别表示读写时间百分比）等计数器，这些都能反映出磁盘的繁忙程度。同时，"\LogicalDisk(_Total)\Current Disk Queue Length"（当前磁盘队列长度）也能反映磁盘I/O请求的等待情况。
网络流量的监控则依赖于"\Network Interface(*)\Bytes Total/Sec"（每秒传输的字节数）和"\Network Interface(*)\Packets/sec"（每秒传输的数据包数）等计数器，通过这些数据可以计算出上传和下载的速率。
CPU使用率的监控通常使用"\Processor(_Total)\% Processor Time"计数器，它表示处理器在执行非空闲线程时花费的时间比例。
在MFC环境中，可以创建一个定时器类，定期调用`PdhCollectQueryData`来更新性能数据，然后使用`PdhGetFormattedCounterValue`将原始数据转换为可读的格式。开发过程中，可能还需要处理`PdhValidatePath`和`PdhValidateCounter`返回的错误，确保添加的计数器路径和计数器本身是有效的。
项目中的"ServerMonitor.VC.db"是Visual Studio的数据库文件，用于存储项目的一些元数据。"ServerMonitor.sln"是解决方案文件，包含了项目的配置和依赖关系。".vs"文件夹包含了Visual Studio工作区的相关设置，"x64"目录可能包含了针对64位架构的编译输出。"ServerMonitor"可能是项目源代码所在的文件夹，而"ipch"则是Intel Precompiled Header（预编译头文件）的缓存目录。
总结起来，"Windows利用Pdh读取机器的磁盘，网络，CPU等信息"这个项目利用了Pdh API，结合C++和MFC，实现了对服务器性能的实时监控，提供了对磁盘使用、网络流量和CPU利用率等关键指标的可视化展示。开发人员可以以此为基础，进一步定制化监控需求，比如添加报警机制或生成性能报告。
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