HINSTANCE在32位操作系统上始终为NULL
2. 其它的句柄可以和某些函数匹配（调用该函数得到一个到该句柄类型的句柄对象）
如：HWND hw= CreateWindowEx(.................);
但是，MS为什么不给相应的结构体，猜测是因为不重要和并没有在MSDN中做成非常显示的链接
CREATESTRUCT
The CREATESTRUCT structure defines the initialization parameters passed to the window procedure of an application. These members are identical to the parameters of the CreateWindowEx function.
typedef struct tagCREATESTRUCT {
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, *LPCREATESTRUCT;
Members
- lpCreateParams
- Contains 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.
If the window being created is an MDI window, this member contains a pointer to an MDICREATESTRUCT structure.
Windows NT/2000/XP: 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
- Handle to the module that owns the new window.
- hMenu
- Handle to the menu to be used by the new window.
- hwndParent
- Handle to 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
- Pointer to a null-terminated string that specifies the name of the new window.
- lpszClass
- Pointer to a null-terminated string that specifies the class name of the new window.
- dwExStyle
- Specifies the extended window style for the new window.
Remarks
Windows NT/2000/XP: 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);
Windows NT/2000/XP: Included in Windows NT 3.1 and later.
Windows 95/98/Me: Included in Windows 95 and later.
Header: Declared in Winuser.h; include Windows.h.
Unicode: Declared as Unicode and ANSI structures.
=================================================================
1.
CREATESTRUCT
The CREATESTRUCT structure defines the initialization parameters passed to the window procedure of an application. These members are identical to the parameters of the CreateWindowEx function.
typedef struct tagCREATESTRUCT {
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, *LPCREATESTRUCT;
2.
MDICREATESTRUCT
The MDICREATESTRUCT structure contains information about the class, title, owner, location, and size of a multiple document interface (MDI) child window.
typedef struct tagMDICREATESTRUCT {
LPCTSTR szClass;
LPCTSTR szTitle;
HANDLE hOwner;
int x;
int y;
int cx;
int cy;
DWORD style;
LPARAM lParam;
} MDICREATESTRUCT, *LPMDICREATESTRUCT;
2.
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