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MESSAGES
The Windows-based applications do not make explicit function calls to acquire input. They wait for the system to pass the input to them. The system passes input to the different windows in the application. Each window has a function, the window process, which is called by the system when it has input for the window. The window process processes the input and returns control to the system. The system passes the input to a window procedure in the form of messages.
The Messages are generated by both the system and applications. The system produces a message for each and every input event - for illustration, when the user types, moves the mouse or clicks a control like a list box. The system also produces messages in response to changes in the system brought about by an application, like when an application resizes one of its windows. An application can produce messages to direct its own windows to perform the tasks or to communicate with windows in other applications.
Whenever a window procedure receives a message, it uses a message identifier to conclude how to process the message. The message identifiers WM_PAINT tell the window procedure that the window's client region has changed and should be repainted. The WM is for common window messages.
The Refresh Method: The refresh method transfer to the first record in the record set. To invoke the refresh method follow the syntax which is as shown below: Form1.Data1.R
You can employ until keyword in two ways to verify a condition in a Do...Loop statement. You can verify the condition before you enter the loop (as illustrated in the following Chk
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Task 1 - Design the DATEX operator's user interfaces for: 1. Preparing messages. 2. Sending messages. 3. Viewing received messages. 4. Optionally view the details of the codin
Adding Records: 1. As in the earlier case Set the DatabaseName property as "C:\ex.mdb", now Set the Record Source for the data control as Customer and Set the Record Type to 0
Tab Order: The tab order stands for the order in which the controls receive focus when the user clicks the tab key. The CTRL + D can be used to set the tab order of controls.
DYNAMIC LINK LIBRARY The dynamic link library (dll) permits one copy of a function to be shared among some parallel executing programs. The dll is a file that contains a num
ToolTip: The ToolTip property is used to flash a message regarding a control object when the mouse pointer moves over that object for a couple of seconds. Pick a control and c
I have an assignment In HCI , can anyone help me ?
How to Include List Box control in your project A list box is used for representing the users with a data. You can prefer the data from the list box for data entry. No editing
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