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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.
Do While Loop Statement : The statements contained by the do...while loop block executes till the condition given in the while is true. The working of do...loop is elaborate
Variable Length Strings: The Strings can be declared using As or $ as shown in the code below; the msg and msg1 are the two strings and they are assigned the values using '='.
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
#12 derived preferredCustomer class
ARCHITECTURE OF WIN 32 PROGRAM Figure: working of Win 3 program The hardware events in the figure are the mouse associated events like the mouse move, left
GDI OBJECTS The CDC provides 5 versions for the GDI objects. They are fonts, brushes, pens, bitmaps and regions. The Select Object function substitutes the current GDI objec
ODBC The ODBC gives an API which distinguishes the data base vendors implementation via the ODBC drivers specific to a DBMS. The program will use the API to call the ODBC dr
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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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