C / C++ / MFC

25-May-05 10:25

You should also see if you can receive the WM_MINMAXINFO message, which is where you are supposed to constrain the minimum and maximum size your window can get.

ScreenSaver Notification

Blake Miller23-May-05 5:16

23-May-05 5:16

What do you do in your top level window to be notified that the screensaver has become active? I want to respond to this and temporarily disable a periodic event.

Likewise, what notification is received once the screensaver has been deactivated and your window is now 'visible' again, even though your window might not be the one that is the 'active' window?

David Crow23-May-05 5:51

David Crow

23-May-05 5:51

How about SetWindowsHookEx(WH_FOREGROUNDIDLE, ...) or SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, ...)?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Blake Miller23-May-05 6:50

23-May-05 6:50

1. I could not see that the WH_FOREGROUNDIDLE would directly apply to the screensaver. I suppose if this event is detected, I could create a different timer to check the SystemParametersInfo every 30 seconds or so to see if the screensaver had become active.

2. This requires polling and is not a notification. I am looking for something sent to all 'top level windows' when the screensaver becomes active.

I did find this one, WlxScreenSaverNotify, but I don't want to replace the GINA DLL.

David Crow23-May-05 7:24

David Crow

23-May-05 7:24

Blake Miller wrote:
1. I could not see that the WH_FOREGROUNDIDLE would directly apply to the screensaver.

My bad.

Blake Miller wrote:
2. This requires polling and is not a notification. I am looking for something sent to all 'top level windows' when the screensaver becomes active.

When a screen saver starts, it posts a WM_SYSCOMMAND message to the foreground window with wParam equal to SC_SCREENSAVE.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Flit23-May-05 6:58

Flit

23-May-05 6:58

I saw this article in the MSDN, hope it helps.

HOWTO: Know When Your Screen Saver Starts
ID: Q238882

Flit23-May-05 9:04

Flit

23-May-05 9:04

If you set a system wide hook for mouse and keyboard when you detect the screen saver has started you'll be able tell when the screen saver has stopped as it is mouse and keyboard activity that they respond to.

Remember that for a system wide keyboard/mouse hook the hook functions need to be in a dll.

Blake Miller25-May-05 3:56

25-May-05 3:56

Thanks. I already hook the low level mouse handler, I can just add a low level keyboard hook to that same DLL.

Blake Miller25-May-05 3:54

Convert from hexadecimal to byte

25-May-05 3:54

Now all I have to do is hope that EVERY possible application that has the foreground focus will post the SAME message to all other top level windows, and then we can all be notified when the screen saver starts. It still does not seem like a sure thing for every window...

Remote debugging

JC907923-May-05 5:13

JC9079

23-May-05 5:13

Hi.
I'm tearing my hair out here. Mad | :mad:

I am trying to debug a .exe on a remote PC. I have done everything mentioned in article "Remote Debugging in MSVC++ 6.0" and in the MSDN help, but get the following when I try to debug...
"Unable to start debugging, access is denied. Verify that you are an administrator or debugger user". I am logged on the remote PC as an administrator, but with a different logon name to the one on my local PC (where I'm also an administrator). Surely this shouldn't matter?????
Also, when it says "verify that YOU are an administrator..." what does it mean by "YOU" who's it looking for????

Any help much appreciated!
Thanks!!

JC.

Re: Remote debugging

User 58385224-May-05 0:49

User 583852

24-May-05 0:49

Sounds like the user is the problem. I think you need to add the user you are logging on to the development machine as to the administrator or debugger group on the target machine

Re: Remote debugging

doublebug24-May-05 9:47

doublebug

24-May-05 9:47

you can use the following command in the command prompt window:

net use \\remotePC /user:remotePC\user_with_admin_rigths *

That should be done before any connection to that remotePC.

The subsequent connections will use user_with_admin_rigths credentials.

WBR
Henry

Re: Remote debugging

JC907924-May-05 21:18

JC9079

24-May-05 21:18

Thanks guys!
I've got it working now. I just needed to type -tcpip and -anyuser after the msvcmon.exe in the command prompt on the remote PC. It seems to default to using pipes.

User 197776923-May-05 5:06

23-May-05 5:06

Hello boys,

I´m novice programming in visual C++ and I don´t know how can I convert an hexadecimal string to a byte array. Can you help me please? Confused | :confused:

Thank you very much Wink | ;)

toxcct23-May-05 5:15

toxcct

23-May-05 5:15

char c = 0;
char str[] = "7D";
sscanf(str, "%X", &c);
 
printf("c = %d = 0x%X", c, c);   // will give you :
                               // c = 125 = 0x7D

TOXCCT >>> GEII power
[toxcct][VisualCalc]

User 197776923-May-05 6:27

23-May-05 6:27

Thank you very much for your reply, Smile | :)

I don´t kown if what you sent could be useful for my purpose, anyway I´m novice and I could be probably wrong. As long as I can see in your code I can´t create a BYTE array, only a char array. Is this correct?

My actual problem is that I have an hexadecimal Hash string (40 elements) and I need to convert this Hash to its equivalent BYTE array. 1 Byte = 2 hexadecimal characters, so I need 20 Bytes in my BYTE array.

The problem is that this Hash can´t change during the conversion!!!

I´m using some Cryptography functions (CryptCreateHash, CryptSetHashParam, CryptSignHash, etc...). I have to set the hexadecimal Hash string as the Hash to sign with the CryptSetHashParam function, but first of all I need to convert this Hash to a BYTE* element.

Thank you very much for your patient Wink | ;)

lynchspawn23-May-05 6:40

lynchspawn

23-May-05 6:40

One way to do it is to use strtoul() on every two characters (while specifying 16 as the base) - looping through to the end of your source of hex chars (need to check for % 2 of course). As each value is returned, you can add them to a CByteArray or a fixed sized array of bytes.

Let me know if this doesn't make sense.

User 197776923-May-05 7:52

23-May-05 7:52

Hello,

I have proved your solution with this code:

		char *demodemoHex = "5863d9e4cbdf522eaa62e0747fceb1c5b249ba13";<br />
		char **stopString;<br />
		BYTE *hexArray = new BYTE[20];<br />
		int j = 0;<br />
		char hexChar[2];<br />
<br />
		for (int i=0; i < 20; i++)<br />
		{<br />
			hexChar[0] = demodemoHex[j];<br />
			hexChar[1] = demodemoHex[j+1];<br />
			hexArray[i] = strtoul(hexChar, stopString, 16);<br />
			j = j + 2;<br />
<br />
		}<br />
<br />
		cout << "@@@@ hexArray value visualization" << endl;<br />
		for (int i = 0; i < 20; i++)<br />
		{<br />
			printf("%2.2x ",hexArray[i]);<br />
		}

And the output is:

@@@@ hexArray value visualization
58 63 d9 e4 cb df 52 2e aa 62 e0 74 7f ce b1 c5 b2 49 ba 13

It seems to be OK!!! I´m going to prove the output hexArray with some Cryptographyc functions. I will tell you what happen.

Thank you very much!!! Smile | :)

User 197776923-May-05 23:58

23-May-05 23:58

I have proved your solution with some cryptography functions (exactly CryptSetHashParam ) and it works correctly.

Thank you very much to all the people that helped me, specially lynchspawn Big Grin | :-D

David Crow23-May-05 7:26

David Crow

23-May-05 7:26

eurosetas wrote:
I can´t create a BYTE array, only a char array...

A BYTE is nothing more than an unsigned char.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

User 197776923-May-05 7:31