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How to write a copyconstructor for a class which has HANDLE as a member in win32 c++ application?


How to write a copyconstructor for a class which has HANDLE as a member in win32 c++ application?

By : annabelle
Date : November 28 2020, 08:01 AM
like below fixes the issue You're having this problem because you're trying to define a copy constructor for a class that contains an abstract resource (as opposed to a value). You'll have to decide what behavior you actually want from your copy constructor. Perhaps you don't even want the class to be copy-constructible in the first place.
For example, consider you class encapulates an opened read-only file. Then, it would make sense for the copy constructor to call DuplicateHandle (as suggested by Matt), and for the destructor to call CloseHandle. There will be no interference between an original instance and a copied instance, since you won't be writing the file.
code :


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How do I use a Win32 Class Library in a Win32 Application in Visual Studio 2010 Express?

How do I use a Win32 Class Library in a Win32 Application in Visual Studio 2010 Express?


By : user2740239
Date : March 29 2020, 07:55 AM
I hope this helps you . First of all you need to decide how you wish to link your 'library' code. Do you want it to be static or dynamic? Static linking means the library you wrote gets 'merged' with your exe. So your exe file will be:
Win32 - Get Main Wnd Handle of application

Win32 - Get Main Wnd Handle of application


By : user3137414
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The host application may have multiple 'main windows'. To detect them, you could
Call GetCurrentProcessId to get the PID of the current process Call EnumWindows to iterate over all toplevel windows of the desktop For each window on the desktop, call GetWindowThreadProcessId to get the PID of the process which created the window If the PID of the window matches the PID of your own process, memorize the window.
code :
struct EnumWindowsCallbackArgs {
    EnumWindowsCallbackArgs( DWORD p ) : pid( p ) { }
    const DWORD pid;
    std::vector<HWND> handles;
};

static BOOL CALLBACK EnumWindowsCallback( HWND hnd, LPARAM lParam )
{
    EnumWindowsCallbackArgs *args = (EnumWindowsCallbackArgs *)lParam;

    DWORD windowPID;
    (void)::GetWindowThreadProcessId( hnd, &windowPID );
    if ( windowPID == args->pid ) {
        args->handles.push_back( hnd );
    }

    return TRUE;
}

std::vector<HWND> getToplevelWindows()
{
    EnumWindowsCallbackArgs args( ::GetCurrentProcessId() );
    if ( ::EnumWindows( &EnumWindowsCallback, (LPARAM) &args ) == FALSE ) {
      // XXX Log error here
      return std::vector<HWND>();
    }
    return args.handles;
}
Win32 WndProc as class member

Win32 WndProc as class member


By : OptoGypsy
Date : March 29 2020, 07:55 AM
Does that help Is there a way to wrap WndProc as private member? , Make it static:
code :
static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
How to handle Win32 Application termination

How to handle Win32 Application termination


By : Alexey Melnikov
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , It is unclear from the question, but if this is a console mode application then you can call SetConsoleCtrlHandler to install a callback that Windows will call just before it terminates your app. Beware that this callback runs on a separate thread and that you have to complete the callback function quickly.
If it is a native Windows program that just doesn't create a window then you really do need a window to get notifications like this. Which is not a problem, it doesn't have to be visible. Just don't call ShowWindow().
How to use Win32 API to get HANDLE of a process for an application in Windows

How to use Win32 API to get HANDLE of a process for an application in Windows


By : sachin
Date : March 29 2020, 07:55 AM
it helps some times GetCurrentProcess() for current process.
OpenProcess() for remote process. See the example.
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