Window unhandled exception error

[robvleugel]

Ugh now what, everything seemed to work fine yesterday, but today started to open my game again and I suffered from another breakpoint memory error. I deleted basicly all of my game code and it comes down to the code below:

It breaks at WglContext.cpp

Code: [Select]

void WglContext::display()
{
    if (m_deviceContext && m_context)
        SwapBuffers(m_deviceContext);
}


Output window:

+      m_context   0x00010002 {unused=0 }   HGLRC__ *
+      m_deviceContext   0x590118ed {unused=??? }   HDC__ *
+      this   0x09224fd0 {m_window=0x0010085a m_deviceContext=0x590118ed m_context=0x00010002 ...}   sf::priv::WglContext * const

My code:

Code: [Select]

#include <SFML\Graphics.hpp>

int main()
{
sf::RenderWindow m_app;
m_app.create(sf::VideoMode(500, 500, 32), "MyProgram");

while(true)
{
m_app.clear(sf::Color(65,5,23));
m_app.display();
}

return 0;
}


Because this code is so basic (and because the example program on the documentation website gives me the same error), it can't be my code right?
I downloaded the newest snapshot of SFML2 and build/installed it but it still gives me the same error.
I'm pretty sure I'm linking with the static debug libraries correctly, as I did not change anything and it used to work fine til today. Removing the "m_app.display();" makes it run.

Linking with:
sfml-system-s-d.lib;sfml-window-s-d.lib;sfml-graphics-s-d.lib;libpq.lib;%(AdditionalDependencies)


What is going on here? I'm completely clueless.

[eXpl0it3r]

I have no idea why there is 'breakpoint' in the title or description, also I don't quite get when it crashes.
SFML has some troubles with it's context handling so we need a little bit more information.
The code looks fine btw, although you should use #include <SFML/Graphics.hpp for various reasons. MSVC will understand it.

• Which compiler do you use? (Okay it's obvious that you use MSVC, but always state this!)
• What are your computer specs, specially GPU?
• When does it break (start, exit, calling display(), etc.)?

[robvleugel]

Ow sorry forgot about that, the error I get is:

Code: [Select]

"Unhandled exception at 0x0af28e0b in MyProgram.exe: 0x0000005: Acces violation reading location 0x0b0f7cf8

[Break] [Continue]

An error like this usually means reading to an unitialized variable.

Running in debug mode, it breaks when calling m_app.display();

I'm using MS Visual studio express edition, on a HP laptop running Windows 7 (intel i5 core with ATI mobility Radeon), 4gig ram.

[robvleugel]

After rebooting my system everything works fine again.
Weird..

[Laurent]

After rebooting my system everything works fine again

You should always do that first, when something that has always worked suddenly breaks without any modification

[robvleugel]

After rebooting my system everything works fine again

You should always do that first, when something that has always worked suddenly breaks without any modification

Yeah, or pull the plug and put it back in.
That's actually how I could've fixed this one as well.
It seems my laptop changes to some other graphics mode when I remove the power cable to save on the battery. It turns out SFML does not work while in this mode, which is strange as most other applications run just fine. I had the power cable back in when this message appeared in the morning, but I guess I forgot to press the "change graphic mode" button on the popup that appears.

I can reproduce the error now simply by changing to this mode.