Hello!

My code:

// -------- INCLUDE ----------------
#include <Windows.h>
#include <windowsx.h>
#include <d3dx9.h>
#include <stdio.h>

IDirect3DDevice9* device = *(IDirect3DDevice9**)0xC97C28; // DirectX Device
IDirect3DTexture9* pTexture; //

bool DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)
{
if(fdwReason == DLL_PROCESS_ATTACH)
{
if(D3DXCreateTextureFromFile(device, L"tex.png", &pTexture) != D3D_OK)
{
printf("Fail!");
return 0;
}
printf("Abc!");
}
return TRUE;
}


Log:

Abc!

I don't know why the crash occurs.
Earlier this code to run!
And today I see crash.

I greet and please for help.

Hello!

My code:

// -------- INCLUDE ----------------
#include <Windows.h>
#include <windowsx.h>
#include <d3dx9.h>
#include <stdio.h>

IDirect3DDevice9* device = *(IDirect3DDevice9**)0xC97C28; // DirectX Device
IDirect3DTexture9* pTexture; //

bool DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)
{
if(fdwReason == DLL_PROCESS_ATTACH)
{
if(D3DXCreateTextureFromFile(device, L"tex.png", &pTexture) != D3D_OK)
{
printf("Fail!");
return 0;
}
printf("Abc!");
}
return TRUE;
}


Log:

Abc!

I don't know why the crash occurs.
Earlier this code to run!
And today I see crash.

I greet and please for help.

In your If statement get rid of the != D3D_OK and just put ! infront of the function

It's also a bad idea to have any code in DLLMain() that will do significant quantities of work (for example calling functions in other DLLs like D3DX). You can very easily deadlock on the loader lock. You should probably not do anything other than initializing variables.

See http://blogs.msdn.com/b/oldnewthing/archive/2004/01/27/63401.aspx and http://msdn.microsoft.com/en-us/library/ms682583 for more details.

Just in this case this value is constant.
Copied from IDA:

push offset dword_C97C2


@UP:
But where in this case I can put the code?

// Edit:
Yes! I found the reason, but,I still do not know the problem and how to solve it.

Once in the main program, I change the number of FPS in 20, i have crash occurs 0 times out of 5 attempts.
But when I change the number of FPS for 100 i have crash occurs 3 times out of 5 attempts.

I know that DirectX device address is constant and I can not use:

IDirect3DDevice9 * device = * (IDirect3DDevice9 **) 0xC97C28 / / DirectX Device

? :/

Could you give me a link with a good guide for how to do it functioning?


PS:
Is there some exception, for example D3DXCreateTextureFromFile that can not be used between the Begin and End Scene?

// Edit:
I worked at 60 FPS for 2 hours and did not get any crash.
I enabled once to 100 FPS and immediately I have crash.

Refresh.

Let me add a few missed facts.
1) I worked with this code of 3 months, when I changed the FPS to 100 there were problems.

2) Method using - a DLL Injector - working in another application.

3) I understand that the addresses of variables in the application are change, but I put the program to "IDA" and I found the "CreateDevice".
In this way, I learned that "0xC97C28" is a pointer to the rendering device.
If the application always put this address in the function of the parameter "CreateDevice", that my reasoning is good?

4) I removed the code "CreateTextureFromFile" - the application does not crash. (100 FPS)

5) I do not see convergence between the Crash, the number of FPS and the "CreateTextureFromFile" but the number of tests carried out indicate that some relationship exists.
If for example the "CreateDeviceFromFile" can not be called after BeginScene and before EndScene that there is a relationship - more FPS - more chance that function called in unauthorised place.

6) Currently I create a thread in DllMain in which later calls a "CreateTextureFromFile".
I know that I should not do this so I improve it. However, I do not think that It correct my mistake.

Creating a thread from DllMain is actually the correct way to do it.

However, unless you created your device with D3DCREATE_MULTITHREADED there's a good chance it will crash when you load the texture as resource creation in dx9 is not threadsafe and should only done from the main thread (correct me if i'm wrong)

Are you trying to make some sort of plugin system for your game or a generic dll that you can plug into any dx9 game?

What error are you getting anyway?