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DEVICE CONTEXT
The device context provides the essential drawing tools and the platform to draw. It helps to draw the text, shapes, lines etc. To create the device context, the MFC provides different classes like CDC and CClientDC.
The CDC is the most primary class to draw in MFC. It provides all of the fundamental drawing steps.
The CClientDC class is used for drawing in the client region of a window.
The Device context is a windows data structure which supports the device independent output.
The function of device context is best elaborated by the figure.
Figure: The Role of Device Context
The logical display is a virtual device and Actual display is the physical device. The programmers do not require worrying about the medium in which he is writing the output. The device context takes care of the output medium.
Message Box: The Message Box can be specified a title as shown in figure to specify the title for the message box follow by the command given below: Private Sub Command1_C
DOCUMENT INTERFACES A SDI (Single document interface) and the MDI (Multiple document interfaces) are the document interfaces. The MDI based applications can have numerous ch
CLASS WIZARD The Class wizard shown in figure is a tool to handle the message handlers for objects, to define the member variables. Figure: Class Wizard
Mostly time, you just desire to assign a single value to a variable you have declared. A variable having a single value is a scalar variable. At other times, this is convenient to
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Explain difference, Generic Variable: Create Object Ex:-Ole-Automation . No need refer the object library. What is Specific Variable: Binding Procedure Early & Late Binding ( Can
While a run-time error takes place, the properties of the Err object are filled with information which uniquely identifies the error & information which can be used to handle it. I
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translate''Q''for insert into element and''Q''delete for deletion element into programming language
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.
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