LRESULT SendMessage( HWND hWnd, // handle of destination window UINT Msg, // message to send WPARAM wParam, // first message parameter LPARAM lParam // second message parameter );
Parameters hWnd Handle to the window whose window procedure will receive the message. If this parameter is HWND_BROADCAST, the message is sent to all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows; but the message is not sent to child windows. Msg Specifies the message to be sent. wParam Specifies additional message-specific information. lParam Specifies additional message-specific information. --------------------------------------------- EM_CHARFROMPOS就是要发送的信息！
应该是用户自定义的吧。WM_USER The WM_USER constant is used by applications to help define private messages, usually of the form WM_USER+X, where X is an integer value. #define WM_USER 0x0400
Res There are five ranges of message numbers: Range Meaning 0 through WM_USER – 1 Messages reserved for use by the system. WM_USER through 0x7FFF Integer messages for use by private window classes. WM_APP through 0xBFFF Messages available for use by applications. 0xC000 through 0xFFFF String messages for use by applications. Greater than 0xFFFF Reserved by the system for future use. Message numbers in the first range (0 through WM_USER – 1) are defined by the system. Values in this range that are not explicitly defined are reserved for future use by the system. Message numbers in the second range (WM_USER through 0x7FFF) can be defined and used by an application to send messages within a private window class. These values cannot be used to define messages that are meaningful throughout an application, because some predefined window classes already define values in this range. For example, predefined control classes such as BUTTON, EDIT, LISTBOX, and COMBOBOX may use these values. Messages in this range should not be sent to other applications unless the applications have been designed to exchange messages and to attach the same meaning to the message numbers. Message numbers in the third range (0x8000 through 0xBFFF) are available for application to use as private messages. Message in this range do not conflict with system messages. Message numbers in the fourth range (0xC000 through 0xFFFF) are defined at run time when an application calls the RegisterWindowMessage function to retrieve a message number for a string. All applications that register the same string can use the associated message number for exchanging messages. The actual message number, however, is not a constant and cannot be assumed to be the same between different sessions. Message numbers in the fifth range (greater than 0xFFFF) are reserved for future use by the system. 没办法，好资料都是英文的。
HWND hWnd, // handle of destination window
UINT Msg, // message to send
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
);
Parameters
hWnd
Handle to the window whose window procedure will receive the message. If this parameter is HWND_BROADCAST, the message is sent to all top-level windows in the system, including disabled or invisible unowned windows, overlapped windows, and pop-up windows; but the message is not sent to child windows.
Msg
Specifies the message to be sent.
wParam
Specifies additional message-specific information.
lParam
Specifies additional message-specific information. ---------------------------------------------
EM_CHARFROMPOS就是要发送的信息！
EM打头的是关于TextBox的，LB打头的是关于ListBox的，等等等等....还是那句话，查MSDN。 :)
The WM_USER constant is used by applications to help define private messages, usually of the form WM_USER+X, where X is an integer value. #define WM_USER 0x0400
Res
There are five ranges of message numbers: Range Meaning
0 through WM_USER – 1 Messages reserved for use by the system.
WM_USER through 0x7FFF Integer messages for use by private window classes.
WM_APP through 0xBFFF Messages available for use by applications.
0xC000 through 0xFFFF String messages for use by applications.
Greater than 0xFFFF Reserved by the system for future use.
Message numbers in the first range (0 through WM_USER – 1) are defined by the system. Values in this range that are not explicitly defined are reserved for future use by the system. Message numbers in the second range (WM_USER through 0x7FFF) can be defined and used by an application to send messages within a private window class. These values cannot be used to define messages that are meaningful throughout an application, because some predefined window classes already define values in this range. For example, predefined control classes such as BUTTON, EDIT, LISTBOX, and COMBOBOX may use these values. Messages in this range should not be sent to other applications unless the applications have been designed to exchange messages and to attach the same meaning to the message numbers. Message numbers in the third range (0x8000 through 0xBFFF) are available for application to use as private messages. Message in this range do not conflict with system messages. Message numbers in the fourth range (0xC000 through 0xFFFF) are defined at run time when an application calls the RegisterWindowMessage function to retrieve a message number for a string. All applications that register the same string can use the associated message number for exchanging messages. The actual message number, however, is not a constant and cannot be assumed to be the same between different sessions. Message numbers in the fifth range (greater than 0xFFFF) are reserved for future use by the system.
没办法，好资料都是英文的。