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LPDIRECT3DDEVICE9 ... failed?
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Hey All
I am trying to create a DLL to handle some directx for me. But it seems to be acting up. If you take a look at the picture below you will see that the LPDIRECT3DDEVICE9 d3ddev; pointer is not being created? While at the same time, the D3DPRESENT_PARAMETERS d3dpp; is.
http://www.exsolved.com/media/d3d.jpg
The directx header is being included at the top of the file like so:
Everything else directx wise works except for
Is there a reason LPDIRECT3DDEVICE9 d3ddev; & LPDIRECT3D9 d3d; are not being created?
Thanks a ton.
I am trying to create a DLL to handle some directx for me. But it seems to be acting up. If you take a look at the picture below you will see that the LPDIRECT3DDEVICE9 d3ddev; pointer is not being created? While at the same time, the D3DPRESENT_PARAMETERS d3dpp; is.
http://www.exsolved.com/media/d3d.jpg
The directx header is being included at the top of the file like so:
#include <d3d9.h> #pragma comment (lib, "d3d9.lib")
Everything else directx wise works except for
LPDIRECT3D9 d3d; LPDIRECT3DDEVICE9 d3ddev;
Is there a reason LPDIRECT3DDEVICE9 d3ddev; & LPDIRECT3D9 d3d; are not being created?
Thanks a ton.
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Join Date: Jul 2006
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You're just creating a pointer variable without actually setting it to anything, so what you're getting is 'worse' than a null pointer, it's a pointer to some random location. The message in the screenshot is caused by the debugger trying to treat whatever's at that random location as a direct3d device, which it almost certainly isn't.
You have to call a function (and I don't remember which one) to actually create and return a direct3d device, then store a pointer to it in a LPDIR...CE9 variable.
Are you following a tutorial or trying to assume/guess how to do things? I would suggest looking at some working source code that uses the API before trying to use it yourself.
You have to call a function (and I don't remember which one) to actually create and return a direct3d device, then store a pointer to it in a LPDIR...CE9 variable.
Are you following a tutorial or trying to assume/guess how to do things? I would suggest looking at some working source code that uses the API before trying to use it yourself.
Plato forgot the nullahedron..
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Oh, and the reason that a D3DPRESENT_PARAMETERS object 'just works' is that the D3DPRESENT_PARAMETERS is a value (structure) type not a pointer type.
Learn this distinction ASAP.
Learn this distinction ASAP.
Plato forgot the nullahedron..
No, I believe I am setting it to something, but during that setup its failing. Here's the exact function taken straight out the DLL source code:
However, it keeps crashing everytime d3ddev is called... usually crashing at the line:
So I added a breakpoint just above that line, and when hovering over d3ddev, it says "iUnknown {...}".
Any ideas mate?
Thanks
extern "C" e2api void initDirectX(HWND &handle, int windowed, int width, int height)
{
d3d = Direct3DCreate9(D3D_SDK_VERSION);
D3DPRESENT_PARAMETERS d3dpp;
LPDIRECT3D9 d3d;
LPDIRECT3DDEVICE9 d3ddev;
ZeroMemory(&d3dpp, sizeof(d3dpp));
d3dpp.Windowed = windowed;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.hDeviceWindow = handle;
d3d->CreateDevice(D3DADAPTER_DEFAULT,
D3DDEVTYPE_HAL,
handle,
D3DCREATE_SOFTWARE_VERTEXPROCESSING,
&d3dpp,
&d3ddev);
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);
d3ddev->BeginScene();
d3ddev->EndScene();
d3ddev->Present(NULL, NULL, NULL, NULL);
}However, it keeps crashing everytime d3ddev is called... usually crashing at the line:
d3ddev->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 40, 100), 1.0f, 0);
So I added a breakpoint just above that line, and when hovering over d3ddev, it says "iUnknown {...}".
Any ideas mate?
Thanks
Does this have something to do with the fact that I am calling DirectX from within a DLL? I have never worked with DLL's before so I am assuming things. Other than that, are you allowed to create/use variables within a DLL?
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Ah ok. There shouldn't be any problem with doing what you're doing from a DLL. I have only ever written DX applications that are staticly linked and DLLs that don't do anything DX, so I don't know for sure if there are any specific issues with DX calls in DLLs, but I would think that it's unlikely to be a problem.
What is the return value from CreateDevice?
What is the return value from CreateDevice?
Plato forgot the nullahedron..
I'm not sure how I check that directly, but I added a breakpoint just below the call, and checked d3d as that's holding CreateDevice's return value (I believe), and it's saying the same thing as d3ddev.. "__vfptr = CXX0030: Error: expression cannot be evaluated". So I think the problem is the CreateDevice function itself. Either I am calling it incorrectly, or one or more of its arguments are not quite there.
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The function call CreateDevice returns a HRESULT (error code), so do:
the possible values are defined as D3D_OK, D3DERR_DEVICELOST, D3DERR_INVALIDCALL, D3DERR_NOTAVAILABLE, D3DERR_OUTOFVIDEOMEMORY ( see http://msdn.microsoft.com/en-us/libr...3(VS.85).aspx).
So do something like:
Just to find out what (if anything) DX thinks is going wrong.
HRESULT result = CreateDevice (...);
the possible values are defined as D3D_OK, D3DERR_DEVICELOST, D3DERR_INVALIDCALL, D3DERR_NOTAVAILABLE, D3DERR_OUTOFVIDEOMEMORY ( see http://msdn.microsoft.com/en-us/libr...3(VS.85).aspx).
So do something like:
switch ( result ) {
case D3DERR_DEVICELOST: std::cerr << "device lost"; break;
... etc ...
}Just to find out what (if anything) DX thinks is going wrong.
Last edited by MattEvans; Jul 5th, 2009 at 10:53 am.
Plato forgot the nullahedron..
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Join Date: Jul 2006
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Just FYI, the __vfptr = CXX0030 thing is because the debugger thinks that d3ddev is pointing to an actual instance of a D3D device, if there's some error in the call to CreateDevice, and for whatever reason the device isn't created, then the pointer doesn't get assigned a value, and it'll have an 'undefined' value (since you don't initialize the pointer to anything). Basically, if you declare & initialize d3ddev like:
Then, should the CreateDevice call fail to initialize that variable, the debugger will give a less confusing message, i.e. it will report d3ddev as still being NULL (and it shouldn't try to dereference it and complain about a bad virtual function table, which is what that __vfptr is all about)
LPDIRECT3DDEVICE9 d3ddev = NULL;
Plato forgot the nullahedron..
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