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WNDCLASSEX declaration

Kaalot · 2004-01-15T05:39:17

Hello! I''ve been spending some time getting familiar with Win32 programming, and much of that involves creating windows over and over until it''s second nature. Last night I began to throw together another window program. For this exercise, I simply created one source file, and put everything in there. Normally, I use classes, inheritance, constructors, etc. (in an attempt to be fancy), but for this last one, just a WinMain() function and a message handler. All window creation stuff was written directly into WinMain. I was having trouble with this, until I moved the WNDCLASSEX declaration outside of WinMain. Declaration outside, window appears. Declaration inside, no window. I was just wondering if anybody might be able to help me with the logic of this. Why does the WNDCLASS(EX) structure need to be declared outside of WinMain? Again, this is assuming one source file, and no special classes. TIA! -K

General and Gameplay Programming Programming

Started by Kaalot January 13, 2004 08:02 AM

12 comments, last by Kaalot 20 years, 3 months ago

JGailor

122

January 14, 2004 10:32 AM

Because you didn''t do one of the two things (memset it to 0, or fill in all data members), hIconSm had garbage in it.

Hence, problem.

SiCrane

11,840

January 14, 2004 10:46 AM

I think he figured that part out.

Anyways, there''s no constructor for WNDCLASSEX. Keep in mind that windows.h (and the rest of the Platform SDK headers) are C style headers. Including constructors would be to a large degree silly. And really, if you initialize the structure members in the order they''re declared in the structure itself, it''s hard to miss one.

Kaalot

122

Author

January 14, 2004 01:14 PM

OK, thanks people. I''ll have to remember to watch that more carefully. And sorry about the constructor question, if that didn''t make any sense. I know there''s a way to peruse all those header files, I just can never remember how...I''ll look it up...

Thanks again for helping me understand what I had missed, and why it was wrong.

-K

amag

152

January 15, 2004 05:39 AM

quote:Does WNDCLASSEX have a constructor that takes all the members of the structure as parameters?

No, but you can inherit from it and create your own ctor. However you cannot use initialisation-list to initialise the members, but instead you have to do it Java-style.

WNDCLASSEX declaration

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WNDCLASSEX declaration

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