就是点‘最大化’或者双击那个‘蓝条’。
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Specifies the type of system command requested. This parameter can be one of the following values.
SC_CLOSE
Closes the window.
SC_CONTEXTHELP
Changes the cursor to a question with a pointer. If the user then clicks a control in the dialog box, the control receives a WM_HELP message.
SC_DEFAULT
Selects the default item; the user double-clicked the window menu.
SC_HOTKEY
Activates the window associated with the application-specified hot key. The lParam parameter identifies the window to activate.
SC_HSCROLL
Scrolls horizontally.
SC_KEYMENU
Retrieves the window menu as a result of a keystroke. For more information, see the Res section.
SC_MAXIMIZE
Maximizes the window.
SC_MINIMIZE
Minimizes the window.
SC_MONITORPOWER
Sets the state of the display. This command supports devices that have power-saving features, such as a battery-powered personal computer.
The lParam parameter can have the following values:1 - the display is going to low power2 - the display is being shut offSC_MOUSEMENU
Retrieves the window menu as a result of a mouse click.
SC_MOVE
Moves the window.
SC_NEXTWINDOW
Moves to the next window.
SC_PREVWINDOW
Moves to the previous window.
SC_RESTORE
Restores the window to its normal position and size.
SC_SCREENSAVE
Executes the screen saver application specified in the [boot] section of the System.ini file.
SC_SIZE
Sizes the window.
SC_TASKLIST
Activates the Start menu.
SC_VSCROLL
Scrolls vertically.
lParam
The low-order word specifies the horizontal position of the cursor, in screen coordinates, if a window menu command is chosen with the mouse. Otherwise, this parameter is not used.
The high-order word specifies the vertical position of the cursor, in screen coordinates, if a window menu command is chosen with the mouse. This parameter is –1 if the command is chosen using a system accelerator, or zero if using a mnemonic.
最大化是怎么实现的这是API后面的Windows实现的,是微软的代码,我们是没法知道的
楼主这是个意思吧