求API函数GetWindowLong的详细说明.

[nlpz]

麻烦谁用通俗点的方法说详细些.





我现在只有以下资料.

函数功能：该函数获得有关指定窗口的信息，函数也获得在额外窗口内存中指定偏移位地址的32位度整型值。
函数原型：LONG GetWindowLong（HWND hWnd，int nlndex）；
参数：
hWnd:窗口句柄及间接给出的窗口所属的窗口类。
nlndex：指定要获得值的大于等于0的值的偏移量。有效值的范围从0到额外窗口内存空间的字节数一4例如，若指定了12位或多于12位的额外类存储空间，则应设为第三个32位整数的索引位8。要获得任意
hwnd ----------- Long，欲为其获取信息的窗口的句柄
nIndex --------- Long，欲取回的信息，可以是下述任何一个常数：
GWL_EXSTYLE
扩展窗口样式
GWL_STYLE
窗口样式
GWL_WNDPROC
该窗口的窗口函数的地址
GWL_HINSTANCE

拥有窗口的实例的句柄

GWL_HWNDPARENT

该窗口之父的句柄。不要用SetWindowWord来改变这个值

GWL_I

[joss]

【别名】
GetWindowLongA
【说明】
从指定窗口的结构中取得信息
【参数】
hwnd ----------- Long，欲为其获取信息的窗口的句柄
nIndex --------- Long，欲取回的信息，可以是下述任何一个常数：
GWL_EXSTYLE
扩展窗口样式
GWL_STYLE
窗口样式
GWL_WNDPROC
该窗口的窗口函数的地址
GWL_HINSTANCE
拥有窗口的实例的句柄
GWL_HWNDPARENT
该窗口之父的句柄。不要用SetWindowWord来改变这个值
GWL_ID
对话框中一个子窗口的标识符
GWL_USERDATA
含义由应用程序规定
DWL_DLGPROC
这个窗口的对话框函数地址
DWL_MSGRESULT
在对话框函数中处理的一条消息返回的值
DWL_USER
含义由应用程序规定
【返回值】
Long，由nIndex决定。零表示出错。会设置GetLastError

[tchatcha]

The GetWindowLong function retrieves information about the specified window. The function also retrieves the 32-bit (long) value at the specified offset into the extra window memory of a window.

LONG GetWindowLong(

HWND hWnd, // handle of window
int nIndex // offset of value to retrieve
);


Parameters

hWnd

Identifies the window and, indirectly, the class to which the window belongs.

nIndex

Specifies the zero-based offset to the value to be retrieved. Valid values are in the range zero through the number of bytes of extra window memory, minus four; for example, if you specified 12 or more bytes of extra memory, a value of 8 would be an index to the third 32-bit integer. To retrieve any other value, specify one of the following values:

Value Action
GWL_EXSTYLE Retrieves the extended window styles.
GWL_STYLE Retrieves the window styles.
GWL_WNDPROC Retrieves the address of the window procedure, or a handle representing the address of the window procedure. You must use the CallWindowProc function to call the window procedure.
GWL_HINSTANCE Retrieves the handle of the application instance.
GWL_HWNDPARENT Retrieves the handle of the parent window, if any.
GWL_ID Retrieves the identifier of the window.
GWL_USERDATA Retrieves the 32-bit value associated with the window. Each window has a corresponding 32-bit value intended for use by the application that created the window.


The following values are also available when the hWnd parameter identifies a dialog box:

Value Action
DWL_DLGPROC Retrieves the address of the dialog box procedure, or a handle representing the address of the dialog box procedure. You must use the CallWindowProc function to call the dialog box procedure.
DWL_MSGRESULT Retrieves the return value of a message processed in the dialog box procedure.
DWL_USER Retrieves extra information private to the application, such as handles or pointers.


Return Values

If the function succeeds, the return value is the requested 32-bit value.
If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Reserve extra window memory by specifying a nonzero value in the cbWndExtra member of the WNDCLASS structure used with the RegisterClass function.

See Also

CallWindowProc, GetWindowWord, RegisterClass, SetParent, SetWindowLong, SetWindowWord, WNDCLASS

[joss]

PB中申明语法
FUNCTION ulong GetWindowulong(ulong hwnd,ulong nIndex) LIBRARY
"user32.dll" ALIAS FOR "GetWindowLongA"