How to solve the hidden alerts problem
Blitz3D Forums/Blitz3D Tutorials/How to solve the hidden alerts problem
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| (I already posted this in the code archives, but I guess when you actually have this problem, you won't find the sourcecode in the archives quickly) Sometimes Windows Api Messages such as System Alerts or Firewall Queries remain invisible because they are drawn to the backbuffer and pause the Blitz App in Fullscreen Mode. This is about how to make sure Windows Messages won't be disguised in the backbuffer in fullscreen mode. Why are the messages not drawn everytime to the front buffer or to the backbuffer, why is it some kind of random game with them? The reason why is there are two buffers, lets name them Buffer 1 and Buffer 2. They always remain Buffer 1 and 2, no matter if we made them Frontbuffer or Backbuffer! And windows (as usual) doesn't know about frontbuffer or backbuffer and simply writes to Buffer 1 all the time. So all we have to do is watch every flip closely and use a counter that will tell us if we are watching Buffer 1 or 2. This is pretty easy, simply replace your current Flip commands with a function call. EG: global flipcounter ... CoFlip() ; replaces a normal Flip ... function CoFlip(waitsync=1) flip waitsync flipcounter=flipcounter xor 1 end function now right before we call a function or external Exe that will force some Win Api High priority Alert (like when you connect to the internet and eg. a Firewall like Zonealarm throws a prompt to the user), to make sure your game won't freeze with an alert in the backbuffer that waits for user action, all you have to do is this: if flipcounter=1 then CoFlip(0) of course, you may also add an additional Renderworld before to make sure everything looks nice. |
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| That's useful information. |
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| Thanks. In fact it was driving me crazy several times (probably irreparably O_o ) |
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