How SendMessage works exactly?

How SendMessage works exactly?

Sends the specified message to a window or windows. The SendMessage function calls the window procedure for the specified window and does not return until the window procedure has processed the message. To send a message and return immediately, use the SendMessageCallback or SendNotifyMessage function.

What is a postMessage?

postMessage() The window. postMessage() method safely enables cross-origin communication between Window objects; e.g., between a page and a pop-up that it spawned, or between a page and an iframe embedded within it. The receiving window is then free to handle this event as needed. The arguments passed to window.

What is Wm_copydata?

Introduction to WM_COPYDATA The WM_COPYDATA message is used to send large blocks of data across process boundaries. It is defined as SendMessage(target, WM_COPYDATA, (WPARAM)sender, (LPARAM)&COPYDATASTRUCT) The WPARAM is the handle of the sending window. The LPARAM is a pointer to a structure of the form.

What is PostQuitMessage?

The PostQuitMessage function posts a WM_QUIT message to the thread’s message queue and returns immediately; the function simply indicates to the system that the thread is requesting to quit at some time in the future.

Is postMessage thread safe?

This method is a thread-safe solution to send messages to windows. Those messages will be handled in the message loop of the application and therefore can be sent from any thread. The difference between SendMessage and PostMessage is the way that they return control to the calling thread.

What is the difference between postMessage and SendMessage?

postMessage: Sends a message in the message queue associated with the thread and returns without waiting for the thread to process that messaage. SendMessage: calls the window procedure for the specified window and does not return until the window procedure has processed the message.

What is Wm_destroy?

It is sent to the window procedure of the window being destroyed after the window is removed from the screen. This message is sent first to the window being destroyed and then to the child windows (if any) as they are destroyed. A window receives this message through its WindowProc function.

What is Wm_quit?

The WM_QUIT message indicates a request to terminate an application and is generated when the application calls the PostQuitMessage function. The WM_CLOSE message is sent as a signal that a window or an application should terminate.

How does the SendMessage function in Win32 work?

SendMessage function. Sends the specified message to a window or windows. The SendMessage function calls the window procedure for the specified window and does not return until the window procedure has processed the message. To send a message and return immediately, use the SendMessageCallback or SendNotifyMessage function.

What does it mean to have message security?

Message security makes the message secure regardless of what transport you use to transmit the message, and the security context is directly embedded inside the message. Support for a wide set of credentials and claims.

How is message security used in Windows Communication Foundation?

Windows Communication Foundation (WCF) has two major modes for providing security (Transport and Message) and a third mode (TransportWithMessageCredential) that combines the two. This topic discusses message security and the reasons to use it. Message security uses the WS-Security specification to secure messages.

How does message security work in WS-Security?

The message security is based on the WS-Security specification, which provides an extensible framework capable of transmitting any type of claim inside the SOAP message. Unlike transport security, the set of authentication mechanisms, or claims, that you can use is not limited by the transport capabilities.