C / C++ / MFC

Re: DrawText() blinking problem

15-Mar-14 7:39

Pity you did not mention that at the beginning.

econy15-Mar-14 8:00

econy

15-Mar-14 8:00

write a test program in a MFC PC program.
Now I think I can use a control, like text box to implement my job.

but I am still wonder how can I use CRect/DrawText() to implement the same job.

What this function does?

Django_Untaken14-Mar-14 19:56

Django_Untaken

14-Mar-14 19:56

Hello Audio/Video Gurus. I don't seem to understand what following does. Here is the function.

void TransformImage_YUY2( BYTE* pDest,
    LONG  lDestStride,
    const BYTE* pSrc,
    LONG  lSrcStride,
    DWORD dwWidthInPixels,
    DWORD dwHeightInPixels)
{
    for (DWORD y = 0; y < dwHeightInPixels; y++)
    {
        RGBQUAD *pDestPel = (RGBQUAD*)pDest;
        WORD    *pSrcPel = (WORD*)pSrc;

        for (DWORD x = 0; x < dwWidthInPixels; x += 2)
        {
            // Byte order is U0 Y0 V0 Y1

            int y0 = (int)LOBYTE(pSrcPel[x]); 
            int u0 = (int)HIBYTE(pSrcPel[x]);
            int y1 = (int)LOBYTE(pSrcPel[x + 1]);
            int v0 = (int)HIBYTE(pSrcPel[x + 1]);

            pDestPel[x] = ConvertYCrCbToRGB(y0, v0, u0);
            pDestPel[x + 1] = ConvertYCrCbToRGB(y1, v0, u0);
        }

        pSrc += lSrcStride;
        pDest += lDestStride;
    }

}

So, whether above function converts YUV to RGB32 or vice versa. Thanks for your input.

Re: What this function does?

Jochen Arndt14-Mar-14 23:42

Jochen Arndt

14-Mar-14 23:42

You may ask the author.
But the meaningful function name ConvertYCrCbToRGB should answer your question.
This link may be also helpful: http://www.equasys.de/colorconversion.html[^].

"Shift+Delete" and "Ctrl+X"

Member 802179614-Mar-14 11:41

14-Mar-14 11:41

we developed a c++ application which its GUI uses default toolbar buttons (cut, copy, paste). It's strange same executable running on some PCs when user uses mouse hovering on the cut button, the tooltip displays as Cut (Ctrl+X); on some other PCs the tooltip displays as Cut (Shift+Delete). Does anyone know the reason and how to fix it? Since Shift+Delete doesn't do real cut. Thanks

Richard MacCutchan15-Mar-14 0:51

15-Mar-14 0:51

You developed it, so you need to look at the source code and find out why the menu or the tooltips are different.

Member 802179617-Mar-14 6:25

17-Mar-14 6:25

As I said in the post the "cut, copy, paste" toolbar buttons are default ones, the tooltip for "Cut" is "Cut the selection and put it on the Clipboard\nCut" was not added by our application. Don't understand why this "Cut" button's tooltip displays differently on different PCs, some PCs show "Ctrl+X", some show "Shift+Delete" which is kind of misleading.

Richard MacCutchan17-Mar-14 6:43

17-Mar-14 6:43

What do you mean by default buttons? They will still need to have associated tooltips which are set in the source code.

Member 802179617-Mar-14 7:12

17-Mar-14 7:12

The default toolbar buttons means when creating this MFC application using application wizard, there is default toolbar generated; we customized other toolbar buttons but leaving "cut, copy, paste" untouched. Thanks

Richard MacCutchan17-Mar-14 7:48

17-Mar-14 7:48

They will still have tooltip text somewhere in the resource files.

Member 802179617-Mar-14 8:02

17-Mar-14 8:02

That's true. The problem is in the whole resource file there is no "Shift+Delete" string found. "Ctrl+X" is used for "cut" button. Why does it show "Shift+Delete" when mouse hovering over it on some PCs? Thanks!

Richard MacCutchan17-Mar-14 8:06

17-Mar-14 8:06

Member 8021796 wrote:
Why does it show "Shift+Delete" when mouse hovering over it on some PCs?

At a guess it is sometimes pulling the resource from a library, but since I don't have access to your codebase it's impossible to be sure. Try to do some further debugging of your code on the systems where it is different.

Theo Buys18-Mar-14 2:10

Theo Buys

18-Mar-14 2:10

Check your (rc) resouce file. Do you have a multi language resource in it? A resource that deal with any language must be set [Neutral].

Member 802179618-Mar-14 10:12

Low-Level Keyboard Input Detection

18-Mar-14 10:12

Thanks! I checked resource file, there is no multi language used. "LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US" is found in rc file.

Don Guy13-Mar-14 7:20

Don Guy

13-Mar-14 7:20

Hey there,

I am writing an software that should be able to detect all keyboard inputs by the user. i.e., both hardware and software/on-screen keyboard.

This software is going to be written in a platform independent way and supposed to run on Windows, Linux, Android & iOS.

The idea is to capture the keyboard inputs from a low level, there by making sure that it doesn't miss any inputs even if it's a on-screen keyboard like in a mobile device.

I am looking at possible open source libraries that can be used.

Anyone got any good ideas on what to use?

Thanks in advance!

Richard MacCutchan13-Mar-14 22:11

13-Mar-14 22:11

Given that those platforms have very different operating systems and hardware it is unlikely that you will find a library that can handle each type, especially at the hardware level. If you want open source code then Google should be your search tool.

Rage14-Mar-14 4:37

Rage

14-Mar-14 4:37

A cross-plattform key-logger Unsure | :~

? This sounds like the ultimate trojan, so finding resources will not be easy...

~RaGE();

I think words like 'destiny' are a way of trying to find order where none exists. - Christian Graus
Entropy isn't what it used to.

Software_Developer16-Mar-14 3:32

Software_Developer

16-Mar-14 3:32

For Windows, here is a global key hook example, prints pressed keycodes to the console. It even works when it's in the background.

And this is a Windows discussion board, also ask in Linux, Android and IOS sections for answers..

C++

#include <windows.h>
#include <stdio.h>

HHOOK hKeyboardHook;

__declspec(dllexport) LRESULT CALLBACK KeyboardEvent (int nCode, WPARAM wParam, LPARAM lParam)
{
 	DWORD SHIFT_key=0;
	DWORD CTRL_key=0;
    DWORD ALT_key=0;

	if  ((nCode == HC_ACTION) &&   ((wParam == WM_SYSKEYDOWN) ||  (wParam == WM_KEYDOWN)))      
	{
		KBDLLHOOKSTRUCT hooked_key = 	*((KBDLLHOOKSTRUCT*)lParam);
		DWORD dwMsg = 1;
		dwMsg += hooked_key.scanCode << 16;
		dwMsg += hooked_key.flags << 24;
		char lpszKeyName[1024] = {0};
		lpszKeyName[0] = '[';

		int i = GetKeyNameText(dwMsg,	(lpszKeyName+1),0xFF) + 1;
		lpszKeyName[i] = ']';

		int key = hooked_key.vkCode;

		SHIFT_key = GetAsyncKeyState(VK_SHIFT);
		CTRL_key = GetAsyncKeyState(VK_CONTROL);
        ALT_key = GetAsyncKeyState(VK_MENU);

		if (key >= 'A' && key <= 'Z')   mmmmmmcjmcfkgkgcgkj.j.g     
		{
			 
			if  (GetAsyncKeyState(VK_SHIFT)>= 0) key +=32;

			if (CTRL_key !=0 && key == 'y' )
			{
               MessageBox(NULL, "CTRL-y was pressed\nLaunch your app here", "H O T K E Y", MB_OK); 
               CTRL_key=0;
			}

			if (CTRL_key !=0 && key == 'q' )
			{
				MessageBox(NULL, "Shutting down", "H O T K E Y", MB_OK); 
               PostQuitMessage(0);
			}



  
			printf("key = %c\n", key);

			SHIFT_key = 0;
			CTRL_key = 0;
			ALT_key = 0;

		}

		printf("lpszKeyName = %s\n",  lpszKeyName );
	}
	return CallNextHookEx(hKeyboardHook,	nCode,wParam,lParam);
}

void MessageLoop()
{
	MSG message;
	while (GetMessage(&message,NULL,0,0)) 
	{
		TranslateMessage( &message );
		DispatchMessage( &message );
	}
}

DWORD WINAPI my_HotKey(LPVOID lpParm)
{
	HINSTANCE hInstance = GetModuleHandle(NULL);
	if (!hInstance) hInstance = LoadLibrary((LPCSTR) lpParm); 
	if (!hInstance) return 1;

	hKeyboardHook = SetWindowsHookEx ( 	WH_KEYBOARD_LL, (HOOKPROC) KeyboardEvent,  	hInstance,  NULL    );
	MessageLoop();
	UnhookWindowsHookEx(hKeyboardHook);
	return 0;
}

int main(int argc, char** argv)
{
	HANDLE hThread;
	DWORD dwThread;

	hThread = CreateThread(NULL,NULL,(LPTHREAD_START_ROUTINE) 	my_HotKey, (LPVOID) argv[0], NULL, &dwThread);

    //ShowWindow(FindWindowA("ConsoleWindowClass", NULL), false);

	if (hThread) return WaitForSingleObject(hThread,INFINITE);
	else return 1;

}