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How to check whether new threads created inside third party DLL in visual c++ application


How to check whether new threads created inside third party DLL in visual c++ application

By : B. Benson
Date : October 24 2020, 06:10 AM
will help you Have the app hook the CreateThread API in its startup code, preferably before the DLLs initialize. This is deep magic though; you gotta know exactly what you're doing.
EDIT: if you have to ask, you're probably not up to the task. Proceed at your own risk.
code :
LONG NTAPI OnExc(_EXCEPTION_POINTERS* Exc)
{
    if (Exc->ExceptionRecord->ExceptionCode == EXCEPTION_BREAKPOINT)
    { //Feel free to add an extra check for exception address
      //Just in case there are rogue INT 3's elsewhere

        wprintf(L"Yay, thread created\n");
        //Not a good idea to do I/O from the exception handler :)

        //Continue from the next command after INT 3
        Exc->ContextRecord->Eip++; 
        return EXCEPTION_CONTINUE_EXECUTION;
    }
    else
        return EXCEPTION_CONTINUE_SEARCH;
}
AddVectoredExceptionHandler(1, OnExc);

HMODULE hKernel32 = GetModuleHandle(L"kernel32.dll");
unsigned char* pCreateThread = (unsigned char*)GetProcAddress(hKernel32, "CreateThread");

//Allow writing to the memory block where CreateThread is
MEMORY_BASIC_INFORMATION mi;
VirtualQuery(pCreateThread, &mi, sizeof mi);
DWORD dw;
VirtualProtect(mi.BaseAddress, mi.RegionSize, PAGE_EXECUTE_READWRITE, &dw);

//Check if the first two bytes are indeed MOV EDI, EDI
if (pCreateThread[0] == 0x8b && pCreateThread[1] == 0xff)
{
    //And patch!
    pCreateThread[0] = 0xcc; //Replace with INT 3 
    pCreateThread[1] = 0x90; //Replace with NOP
}


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Loading a third party dll in visual c++/qt application

Loading a third party dll in visual c++/qt application


By : user3081990
Date : March 29 2020, 07:55 AM
This might help you You load the library with the API function LoadLibrary. After loading the DLL you use GetProcAddress to get the entry point for a specific function.
If it's a C++ library, you may have to care for the decorated names. The tools dumpbin and undname may help to identify what is really exported by the DLL.
How to make Fiddler decrypt HTTPS sites when it is inside an application created by Visual Studio

How to make Fiddler decrypt HTTPS sites when it is inside an application created by Visual Studio


By : Jaydeep
Date : March 29 2020, 07:55 AM
should help you out Check that you have configured Fiddler to capture AND decrypt HTTPS sessions. Further check your personal certificate store, can you find a DO_NOT_TRUST_FiddlerRoot certificate there?
Logging uncaught exceptions in threads created by third-party code in web application

Logging uncaught exceptions in threads created by third-party code in web application


By : Dean Cooksey
Date : March 29 2020, 07:55 AM
seems to work fine It turns out that this is not necessary with Glassfish, because Glassfish already does it - but I was looking at the wrong place in the logs.
The exception was printed to the main server.log file - not to my application's own log4j log file.
Should threads created inside main and threads created inside functions behave differently?

Should threads created inside main and threads created inside functions behave differently?


By : AyPrie
Date : March 29 2020, 07:55 AM
it helps some times Possible reason for what you're seeing;
Because you did not specify which version of C++ you're using, I'll assume its C++11; As per Is cout thread-safe
How to kill all the threads in application That are designed by 3rd party library

How to kill all the threads in application That are designed by 3rd party library


By : Robbie P
Date : March 29 2020, 07:55 AM
hope this fix your issue You cannot forcibly stop threads in java. The thread has to work with you: It needs to have a core loop that looks a bit like this:
code :
while (running && !Thread.interrupted()) {
    // do something that won't take long.
    try {
        Thread.sleep(1000L); // or some other 'wait a while' code.
    } catch (InterruptedException e) {
        return;
    }
System.exit(0);
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