´m reading TOTWGPG and i get into the gdi part. so i make this code: bool BotarLine(HWND hwnd) { HDC hdc = GetDC(hwnd); HPEN pen = NULL; HPEN oldpen = NULL; pen = CreatePen(PS_SOLID,1,RGB(0,255,0)); oldpen = SelectObject(hdc, pen); <= the error is here // do line stuff SelectObject(hdc,oldpen); DeleteObject(pen); return 0; } is exact the thing that was explained in TOTGPG but i always get this error: C:\projetos\treino\treinoadv.cpp(29) : error C2440: ''='' : cannot convert from ''void *'' to ''struct HPEN__ *'' Conversion from ''void*'' to pointer to non-''void'' requires an explicit cast Error executing cl.exe. so what is wrong? i already used the vc++ documentation but they do the same thing i do too i even tryed to compile the similar code thats comes in TOTGPG but it gives me the same error so someone can help me? -...you know, brazilian girls have a big ..., it would be the happiest day of may live...

you know when you put oldpen = SelectObject(hdc, pen); ??

Change that to
oldpen = (HPEN)SelectObject(hdc, pen);

It needs a special type of cast. That'll probably fix it! If it doesn't, then change pen = CreatePen(PS_SOLID,1,RGB(0,255,0)); to:
pen = (HPEN)CreatePen(PS_SOLID,1,RGB(0,255,0));

Do that ONLY if my first solution doesn't work. If my first solution doesn't work, keep the (HPEN) on there- you definately need it to. Sorry, I'm a little rusty on my GDI, but my first solution should work if memory serves me right.



There are three types of people in the world; those who can count, and those who can't.

Edited by - Fredric on May 22, 2000 1:37:13 PM

Yeah I got the same problem, but i just took a look in the source code on the CD, and sure enough, it used the cast that Frederic mentioned. I mean, if you look at your error message, it even tells you that you need to cast it.


"Born of a Broken Man, but not a broken man."

Could you be using vc5, zipster? I''m using vc6, and in similar posts (this kind of question pops up a lot), people usually say that vc6 typechecks much harder than no 5

i do not tryed that yet but i remenber somenthing about that in "Windows Game Progaming For Dummies" weird he don´t somenthing about it in TOWGPG

worked!!!! thanks guys

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