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CREATESTRUCT info  Overview  Group

The CREATESTRUCT structure defines the initialization parameters passed to the window procedure of an application.

typedef struct tagCREATESTRUCT { // cs 

    LPVOID    lpCreateParams; 

    HINSTANCE hInstance; 

    HMENU     hMenu; 

    HWND      hwndParent; 

    int       cy; 

    int       cx; 

    int       y; 

    int       x; 

    LONG      style; 

    LPCTSTR   lpszName; 

    LPCTSTR   lpszClass; 

    DWORD     dwExStyle; 

} CREATESTRUCT; 

 

Members

lpCreateParams
Additional data which may be used to create the window. If the window is being created as a result of a call to the CreateWindow or CreateWindowEx function, this member contains the value of the lpParam parameter specified in the function call.

Windows NT: If the window is being created from a dialog template, this member is the address of a SHORT value that specifies the size, in bytes, of the window creation data. The value is immediately followed by the creation data. For more information, see the following Remarks section.

hInstance
Identifies the module that owns the new window.
hMenu
Identifies the menu to be used by the new window.
hwndParent
Identifies the parent window, if the window is a child window. If the window is owned, this member identifies the owner window. If the window is not a child or owned window, this member is NULL.
cy
Specifies the height of the new window, in pixels.
cx
Specifies the width of the new window, in pixels.
y
Specifies the y-coordinate of the upper left corner of the new window. If the new window is a child window, coordinates are relative to the parent window. Otherwise, the coordinates are relative to the screen origin.
x
Specifies the x-coordinate of the upper left corner of the new window. If the new window is a child window, coordinates are relative to the parent window. Otherwise, the coordinates are relative to the screen origin.
style
Specifies the style for the new window.
lpszName
Points to a null-terminated string that specifies the name of the new window.
lpszClass
Points to a null-terminated string that specifies the class name of the new window.
dwExStyle
Specifies the extended style for the new window.

Remarks

Windows NT: You should access the data represented by the lpCreateParams member using a pointer that has been declared using the UNALIGNED type, because the pointer may not be DWORD aligned. This is demonstrated in the following example:
typedef struct tagMyData 

{ 

    // Define creation data here. 

} MYDATA; 

 

typedef struct tagMyDlgData 

{ 

    SHORT   cbExtra; 

    MYDATA  myData; 

} MYDLGDATA, UNALIGNED *PMYDLGDATA; 

 

PMYDLGDATA pMyDlgdata = 

    (PMYDLGDATA) (((LPCREATESTRUCT) lParam)->lpCreateParams); 

 

See Also

CreateWindow, CreateWindowEx


file: /Techref/os/win/api/win32/struc/src/str02_23.htm, 4KB, , updated: 2000/4/7 11:20, local time: 2024/12/25 09:38,
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