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DLL and graphics

Posted on 1997-08-05
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Last Modified: 2008-03-03
I'm a beginner in C++. I want to know how can I call the functions in the DLL files? Do I need to convert it into lib files? If it is true, then how to use it?
I used to write my C++ programs in turbo C++ 2.0 which is a dos version. But since I need to call the functions in a DLL file, I need to change to a window based version. But I found that all the functions in GRAPHICS.H are not supported in the windows version. So, how can I draw a putpixel? (e.g. putpixel) and how to change the color palette to 256 or 16 gray scales?
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Question by:rw8
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mosfet earned 200 total points
ID: 1166842
When you switch over to a windows compiler, you'll see that they have their own ways of calling dll functions. You'll have to remember though that graphics in windows is totally different than graphics in dos. In dos you can write directly to the screen either by memory access or by functions that do it for you. In windows, you can't do this. Windows won't let you access the video memory, and instead has its own functions that will write graphics pixels into a window. The only way to write directly to the screen is to use the DirectDraw in windows95, but then again, you still aren't really directly accessing the screen. It probably won't be too hard to convert the graphics routines you have to windows, the only thing you have to remember is that it will be in its own little window, and also remember that windows likes to control everything on the computer itself, and that's why I still prefer DOS.
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by:rw8
ID: 1166843
If I want to call a function "startgrab" from the dll "vfpcv.dll"
using the Borland c++ 4.X complier, how can I do that?
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