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Converting C# void* to byte[]


Converting C# void* to byte[]

By : sinpamov
Date : November 20 2020, 07:00 PM
Does that help This kind of code can never work in a generic way. It relies on a hard assumption that the memory layout for T is predictable and consistent. That is only true if T is a simple value type. Ignoring endianness for a moment. You are dead in the water if T is a reference type, you'll be copying tracking handles that can never be deserialized, you'll have to give T the struct constraint.
But that's not enough, structure types are not copyable either. Not even if they have no reference type fields, something you can't constrain. The internal layout is determined by the JIT compiler. It swaps fields at its leisure, selecting one where the fields are properly aligned and the structure value take the minimum storage size. The value you'll serialize can only be read properly by a program that runs with the exact same CPU architecture and JIT compiler version.
code :


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Explain this C# code: byte* p = (byte*) (void*) Scan0;

Explain this C# code: byte* p = (byte*) (void*) Scan0;


By : Andjela Stošić
Date : March 29 2020, 07:55 AM
it should still fix some issue First converts the IntPtr to a void pointer. Then to a byte pointer. This is unsafe code.
More on unsafe code: http://msdn.microsoft.com/en-us/library/aa288474%28VS.71%29.aspx
error: converting from ‘void (FlashWork::*)(int, siginfo_t*, void*)’ to ‘void* (*)(int, siginfo_t*, void*)’

error: converting from ‘void (FlashWork::*)(int, siginfo_t*, void*)’ to ‘void* (*)(int, siginfo_t*, void*)’


By : Talip Durmuş
Date : March 29 2020, 07:55 AM
seems to work fine "Pointer to members" are not compatible with "pointers to functions", unless it's a static member. The reason is that a pointer to member needs an object (a FlashWork object) in your case.
Converting void* to byte array

Converting void* to byte array


By : user2448014
Date : March 29 2020, 07:55 AM
To fix the issue you can do Since java do not have void* and jni do not have ByteArray, it's not clear what's your execution environment.
Since the source of problem is the void* pixel map, I would assume you want to create a java Bitmap object with the pixels, with a mix of JNI and Java code.
Error converting void(__cdecl MyClass::*)() to void *

Error converting void(__cdecl MyClass::*)() to void *


By : user2846534
Date : March 29 2020, 07:55 AM
like below fixes the issue You have two problems. First, void* is a data pointer, not a function pointer. According to the C++ standard, casting between the two is not expected to work. Some platforms provide a stronger guarantee... for example Windows GetProcAddress and *nix dlsym mix the two.
Next, your &MainWindow::MyFrameSizeCallback is not a function pointer, it is a pointer-to-member-function. Calling it requires a MainWindow object, which the external library doesn't know anything about.
code :
MainWindow* MainWindow::the_window;

void MainWindow::MyFrameSizeCallback(T x)
{
    do_stuff;
}

void _stdcall MyFrameSizeCallbackShim(T x)
{
    MainWindow::the_window->MyFrameSizeCallback(x);
}

void MainWindow::someFunction()
{
    IGrabChannel* pChannel0 = something;
    the_window = this;
    V_AssignFrameSizeCallback(pChannel0, &MyFrameSizeCallbackShim);
}
Cannot convert (Timer!) -> Void to ((CFRunLoopTimer?) ->Void)! - Converting NSTimer extension to Swift 3

Cannot convert (Timer!) -> Void to ((CFRunLoopTimer?) ->Void)! - Converting NSTimer extension to Swift 3


By : aman ghatge
Date : March 29 2020, 07:55 AM
hop of those help? I am trying to convert a Pod I am using in my project to Swift 3. I didn't write it, but the original author has not updated it so I forked it any I'm trying to do it myself. But... , Try like this:
code :
extension Timer {
    class func schedule(delay: TimeInterval, handler: ((Timer?) -> Void)!) -> Timer! {
        let fireDate = delay + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, 0, 0, 0, handler)
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, .commonModes)
        return timer
    }
    class func schedule(repeatInterval interval: TimeInterval, handler: ((Timer?) -> Void)!) -> Timer! {
        let fireDate = interval + CFAbsoluteTimeGetCurrent()
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, interval, 0, 0, handler)
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, .commonModes)
        return timer
    }
}
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