对话框的初始化可能需要此信息，或者此信息可能涉及有关父窗体的应用程序状态的特定详细资料。
This information might be required for initialization of the dialog box or involve specific details about the application state of the parent form.
通过处理此事件，可以添加一些代码，用于在加载主窗体之前初始化应用程序。
By handling this event, you can add code that initializes the application before the main form is loaded.
一个指向CREATESTRUCT结构的指针，该结构包含即将被创建的窗体的初始化参数。
Pointer to a CREATESTRUCT structure that contains initialization parameters for the window about to be created.
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