Windows message daily training-wm_create

Wm_create is issued before the createwindow () function returns, and the window has been created.

Wparam is unavailable, and lparam points to the createstruct structure.

The createstruct structure contains some information about the window:

Typedef struct tagcreatestruct {
Lpvoid lpcreateparams;
Hinstance;
Hmenu;
Hwnd hwndparent;
Int Cy;
Int CX;
Int y;
Int X;
Long style;
Lpctstr lpszname;
Lpctstr lpszclass;
DWORD dwexstyle;
} Createstruct, * lpcreatestruct;

Some of the information in the createstruct structure is provided by wndclass and some are provided by createwindow.

In the wm_create message,-1 is returned, and createwindow () Fails. createwindow () returns a null handle, and 0 indicates success.