hello,
i am writing my first game in VC++ SDK Snakes and ladders.

in the game every time a new player throws the dice and moves to the new position i have to load the bitmap of player token on the new position and remove it from the old for this purpose i am calling InvalidateRect() and invalidating the rectangle of the old position and set a flag so that in paint it will now load at a new position but when i pass Hwnd parameter as the handle to the window it does not Post a paint message immediately , but when i pass Null to it it does and the whole game board is refreshed and new position restored.

can anyone tell me how i can get the Paint message posted so that i can refresh immediately and only that portion which i hae Invalidated .

also i have to then right this entire code in class wrppaers so can anyone tell me from wher i can get class wrapper codes of any information on how wrap these window creatin etc code in class wrappers. i am not supposed to use MFC hence i have to wrap it in my own classes.

: hello,
: i am writing my first game in VC++ SDK Snakes and ladders.
:
: in the game every time a new player throws the dice and moves to the new position i have to load the bitmap of player token on the new position and remove it from the old for this purpose i am calling InvalidateRect() and invalidating the rectangle of the old position and set a flag so that in paint it will now load at a new position but when i pass Hwnd parameter as the handle to the window it does not Post a paint message immediately , but when i pass Null to it it does and the whole game board is refreshed and new position restored.
:
: can anyone tell me how i can get the Paint message posted so that i can refresh immediately and only that portion which i hae Invalidated .
:
: also i have to then right this entire code in class wrppaers so can anyone tell me from wher i can get class wrapper codes of any information on how wrap these window creatin etc code in class wrappers. i am not supposed to use MFC hence i have to wrap it in my own classes.
:
In general your code will look like that:
1. Remove player from the previous location - I mean coordinates - do not draw anything yet.

2. Put a player to a new location - again - no drawing.

3.
InvalidateRect (hWnd, pRectOldLocation, TRUE);
InvalidateRect (hWnd, pRectNewLocation, TRUE);

// This is where your code inside WM_PAINT response
// will draw the changes.
UpdateWindow (hWnd);

: : hello,
: : i am writing my first game in VC++ SDK Snakes and ladders.
: :
: : in the game every time a new player throws the dice and moves to the new position i have to load the bitmap of player token on the new position and remove it from the old for this purpose i am calling InvalidateRect() and invalidating the rectangle of the old position and set a flag so that in paint it will now load at a new position but when i pass Hwnd parameter as the handle to the window it does not Post a paint message immediately , but when i pass Null to it it does and the whole game board is refreshed and new position restored.
: :
: : can anyone tell me how i can get the Paint message posted so that i can refresh immediately and only that portion which i hae Invalidated .
: :
: : also i have to then right this entire code in class wrppaers so can anyone tell me from wher i can get class wrapper codes of any information on how wrap these window creatin etc code in class wrappers. i am not supposed to use MFC hence i have to wrap it in my own classes.
: :
: In general your code will look like that:
: 1. Remove player from the previous location - I mean coordinates - do not draw anything yet.
:
: 2. Put a player to a new location - again - no drawing.
:
: 3.
: InvalidateRect (hWnd, pRectOldLocation, TRUE);
: InvalidateRect (hWnd, pRectNewLocation, TRUE);
:
: // This is where your code inside WM_PAINT response
: // will draw the changes.
: UpdateWindow (hWnd);
:
:


thanks ,
but i want to ask is where to call the UpdateWindow. i tried doing it immediately after InvalidateRect() but nothing changed i mean it did not call the WM_PAINT immediately .

also is there any flag to be set or something like that which indicates that only this area is to be painted and then execute the code inside WM_PAINT only if that flag is set.

This message was edited by AsmGuru62 at 2002-11-6 7:41:12

---

: : : hello,
: : : i am writing my first game in VC++ SDK Snakes and ladders.
: : :
: : : in the game every time a new player throws the dice and moves to the new position i have to load the bitmap of player token on the new position and remove it from the old for this purpose i am calling InvalidateRect() and invalidating the rectangle of the old position and set a flag so that in paint it will now load at a new position but when i pass Hwnd parameter as the handle to the window it does not Post a paint message immediately , but when i pass Null to it it does and the whole game board is refreshed and new position restored.
: : :
: : : can anyone tell me how i can get the Paint message posted so that i can refresh immediately and only that portion which i hae Invalidated .
: : :
: : : also i have to then right this entire code in class wrppaers so can anyone tell me from wher i can get class wrapper codes of any information on how wrap these window creatin etc code in class wrappers. i am not supposed to use MFC hence i have to wrap it in my own classes.
: : :
: : In general your code will look like that:
: : 1. Remove player from the previous location - I mean coordinates - do not draw anything yet.
: :
: : 2. Put a player to a new location - again - no drawing.
: :
: : 3.
: : InvalidateRect (hWnd, pRectOldLocation, TRUE);
: : InvalidateRect (hWnd, pRectNewLocation, TRUE);
: :
: : // This is where your code inside WM_PAINT response
: : // will draw the changes.
: : UpdateWindow (hWnd);
: :
: :
:
:
: thanks ,
: but i want to ask is where to call the UpdateWindow. i tried doing it immediately after InvalidateRect() but nothing changed i mean it did not call the WM_PAINT immediately .
:
: also is there any flag to be set or something like that which indicates that only this area is to be painted and then execute the code inside WM_PAINT only if that flag is set.
:
:
Then, obviously, there is something wrong with the code. UpdateWindow() can fail for a lot of reasons:

1. HWND you sending is not HWND you expect it to update.
2. The rectangle coordinates are incorrect/negative
... it can be anything...

I never heard that problem before - usually you do not blame API which is tested good enough. The problem is in 99.999% in the client code.


Post a small pieces of code where you do stuff...