undefined structure REGS ??

co-co · 2002-12-24T09:48:03+00:00

I keep getting a compile error saying undefined structure ''REGS'' the code is: union REGS inregs, outregs; I searched and found many examples of this peice of code, i dont know what it does but i need it for a tutorial. Anyone know what I would have to do for the compiler to recognize REGS?

Hi co-co,
REGS is a structure defined in the dos.h header files of DOS C/C++ compilers. This structure was used while making direct calls to bios functions under DOS.
Windows however, is a whole new ball game. It does not allow you to make direct calls to the bios. Hence the REGS structure is not defined in the dos.h file included with Windows C/C++ compilers like Visual C++.
If you want to compile this code, use a DOS C/C++ compiler (like Turbo C++ 3) and be sure to include the dos.h file.
Making direct BIOS calls under Windows is very messy. Think Dll thunking and/or VXDs. However, you can perform nearly all the required functions using the Win32 API anyway, so you practically never need to make Bios calls.

Hope this helped.
Tanuj

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