Drawing Text
After an application selects the appropriate font, sets the required
text-formatting options, and computes the necessary character width and height values
for a string of text, it can begin drawing characters and symbols by calling any
of the four text-output functions. Two of these functions,
DrawText and
TabbedTextOut, are part of Window Manager and found in the library USER.DLL; the remaining
two functions are part of GDI and found in the library GDI.DLL. When an
application calls one of these functions, the operating system passes the call to the
graphics engine, which in turn passes the call to the appropriate device
driver. At the device driver level, all of these calls are supported by one or more
calls to the driver's own
ExtTextOut or
TextOut function. An application will achieve the fastest execution by calling the
ExtTextOut function, which is quickly converted into an
ExtTextOut call for the device. However, there are instances when an application should
call one of the other three functions; for example, to draw multiple lines of
text within the borders of a specified rectangular region, it is more efficient
to call the
DrawText function. To create a multicolumn table with justified columns of text, it is
more efficient to call the
TabbedTextOut function.
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