Why is the value in WMI API not changed in buffer gi get with wmimgmt.msc command even though the c++ program has changed the value of some parameters in wmimgmt.msc?

When you change the value of some parameter in WMI using a C++ program, as you stated, and then check that value with the wmimgmt.msc command, there are several possible reasons why the value is in the WMI API does not change the buffer:

 Caching: WMI can use caching mechanisms to increase performance. When you query a value from WMI, it can cache the value to avoid re-querying from the original data source. This can lead to not seeing the change immediately when you change the value in the C++ program. To refresh the cache and see the latest changes, you can try reloading or repopulating the data in the wmimgmt.msc command.
 Scope: WMI has different scopes, such as Local Machine or Remote Machine. When you change a value in a C++ program, make sure you're making the change in the same scope that you're querying in wmimgmt.msc. If you change the value in the Local Machine scope, but then query from the Remote Machine scope in wmimgmt.msc, you will not see the change.
 Error or out of sync: An error or asynchrony may occur between the value change in the C++ program and the querying in wmimgmt.msc. This can be caused by problems related to access rights, incorrect configuration, or errors in the program code. Make sure that you have carefully tested your program code and made sure it works properly.

If you are having specific problems changing values in WMI and are not seeing the change in wmimgmt.msc, please provide more information about your C++ code and how you execute queries in wmimgmt. msc. This makes it possible for me to provide more detailed assistance to resolve your issue.