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8.6

C++ .net (CLR) use Hotkey for Show/Hide Form

Asked by seek1338 in Microsoft Visual C++.Net, C++ Programming Language, .NET Framework 3.x versions

Tags: Hooks, Hotkey

Hello!

I am very new c++ Programmer i have read a book and now try to writte my first Program using Mysql Connection.

My Problem is i want to make a Timer or new Thread that search after F4 pressed and then call a Function to Hide or Show the Main Form.

Since 4 Days i am searching for a function that can do that. In .net i found the System::Windows::Input namespace for WPF i use that in c++ by including the dll and the WindowsBase, but i dont found a solution.

Second thing i found are the Hooks now i am trying to implement this WINAPI in my c++ .net use a Thread with a while(true) for check every 5 ms the state.

I need a sample code how i can use this HOOKS in my .net projekt. Look at Code i Post the Thread. But i dont know how i can use the Dllimport.

That have to be a possibiltiy to make a easy if check like this:
while(true) {
Thread::Sleep(5); // wait 5ms to dont overload the prozessor
if(checkKeyState(F4))
//to this...
}

I hope anyone can give me a code sample or a link to a code sample where this is explain because i dont found for c++ clr anything like this.

Thanks for your Help.

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             // Call Thread Code:
#include "keyEventThread.h"
 
Thread^ keyThread = gcnew Thread( gcnew ThreadStart( &keyEventThread::waitOnKey ) );
keyThread->SetApartmentState(ApartmentState::STA);
keyThread->Start();
 
 
// THREAD FILE "keyEventThread.h":
#pragma once
using namespace System;
using namespace System::Windows;
using namespace System::Threading;
using namespace System::Runtime::InteropServices;
 
[DllImport("User32.dll", EntryPoint = "SetWindowsHookEx")]
extern "C" long SetWindowsHookEx(long HookID, HookProc^ lpfn, IntPtr hInstance, long ThreadID);
 
[DllImport("User32.dll", EntryPoint = "CallNextHookEx")]
extern "C" long CallNextHookEx(long HookID, long iCode, IntPtr wParam, IntPtr lParam);
 
[DllImport("User32.dll", EntryPoint = "UnhookWindowsHookEx")]
extern "C" bool UnhookWindowsHookEx(long HookID);
 
//CLASS Managed
ref class keyEventThread  
{
public:
 static void waitOnKey() {
 while(true) {
    Thread::Sleep(5);
    /* Check here for F4 if pressed */
    // SetWindowsHookEx(WH_KEYBOARD_LL,0, // I dont know how to use The WinApi
    }
 }
};

           
         

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C++ .net (CLR) use Hotkey for Show/Hide Form

Asked by seek1338 in Microsoft Visual C++.Net, C++ Programming Language, .NET Framework 3.x versions

Tags: Hooks, Hotkey

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