user32: redrawwindow
BlitzPlus Forums/BlitzPlus Programming/user32: redrawwindow
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| I was having a gander at some user32.dll stuff and I found this redrawwindow command. When Ive tried to get it working it crashes blitz out. Anybody know the correct way to get it working? Thanks Mr Brinne |
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| Well, it works fine for me, though doesn't seem terribly useful. How are you calling it? |
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| I am interested in this. Any examples? |
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| the blitz code I'm calling is so: w = CreateWindow("", 100,100,200,200,0) redrawwindow(queryobject(w, 1), 0, 0, 0) I also tried: w = CreateWindow("", 100,100,200,200,0) redrawwindow(queryobject(w, 1), 0, 0, 1) It has to be said I couldn't find the values for the flags RDW_.... not even in the massive list of win32 consts posted by defiance: http://www.blitzbasic.com/codearcs/codearcs.php?code=589#comments The user32.decls line is declared like so: RedrawWindow%(hwnd%, lprcupdate*, hrgnupdate%, furedraw%) my suspicions are it is either a) dodgy flag setup b) somat to do with lprcupdate* bit of the redrawwindow line in user32.decls Mr Brine |
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| Yes, you're right. Issue #1: Change the lprcupdate* in the declaration to lprcupdate%. You want to do this since you're passing NULL (0). The way it is now, Blitz is trying to dereference 0 (get the value at address 0), and you're getting a memory access violation. It will work fine after that, you'll see. Issue #2: Yes the list of Windows constants isn't so complete as many think. You can see at the bottom of the doc page that the RDW* constants are actually defined in windows.h (or possibly winuser.h). Those are included with VC++ or the Windows Platform SDK (free, if you can find it on MS' site -- I can't). Just open up the .h file and search for the names. I would do it for you except my personal system is running a disk diagnosis right now so I can't look at it. You might also have luck looking on google. |
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| Please post this when you have a working demo! |
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| Incidentally, here are the RedrawWindow flags: #define RDW_INVALIDATE 0x0001 #define RDW_INTERNALPAINT 0x0002 #define RDW_ERASE 0x0004 #define RDW_VALIDATE 0x0008 #define RDW_NOINTERNALPAINT 0x0010 #define RDW_NOERASE 0x0020 #define RDW_NOCHILDREN 0x0040 #define RDW_ALLCHILDREN 0x0080 #define RDW_UPDATENOW 0x0100 #define RDW_ERASENOW 0x0200 #define RDW_FRAME 0x0400 #define RDW_NOFRAME 0x0800 Of course, replace "#define" with "Const", and "0x" with "=$". |
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