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Here is a very simple method of moving the box:
You need to start by calculating the value of the slope ratio between horizontal and vertical size of the Window's client area. You need this as a floating point value as it will be used to calculate positions further on.
Declare a static float value named slopeRatio, and add the following code to either the initialisation (e.g. WM_CREATE), or whenever the Window is resized (WM_SIZE).
RECT rcClient;
GetClientRect(hWnd, &rcClient);
float horiz = (float)rcClient.right; float vert = (float)rcClient.bottom; slopeRatio = horiz / vert;
Then when you need to calculate the new X and Y positions of your drawing (after the button press) do the following:
currentX += 30; tempY = (float)currentX / slopeRatio;
currentY = (int)tempY;
InvalidateRect(hWnd, nullptr, TRUE);
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Does anyone here have to maintain Labview Projects? If so what are thoughts and concerns?
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This[^] looks to be a great place for you to get started.
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so, i was doing some programming with eclipse and stuff. But then i noticed that all of my .JAR files suddenly looked like a pinguin with some painting stuff on his hands. i need help, cause im not sure what is going on!! I use windows.
[SOLVED] I had to right click a JAR file, and "press open in application" then select Java JDK. For some reason i had two of those...
modified 1-Sep-20 4:02am.
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Member 14927382 wrote: (no trashmail please)
 and you expect the spammers who have harvested this email to respect that. Remove your email address and rely on CP to notify you when there is a response.
Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP
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I'm debugging the client's DHСP code on winsock and after receiving DHCPACK I want to check the received IP for a conflict. But I don't know how to. Could someone help with example?
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That would probably depend on what you mean by "conflict"?
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I mean to check retrieved from DHCP server IP address is exist a some device in local network with same IP address or not. If exist I have to send DHCPDECLINE to DHCP server and request another IP address
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What are you writing? This is all handled by the network stack, so a normal application wouldn't even know this was going on.
If the IP is already bound to the adapter, you have no way of knowing that because if you try to ping it using the easy and normal methods, you'll only get a response from your own machine, like "ping localhost".
If you try to do this before the IP is bound to the adapter, you don't have an IP yet, so you can't use the easy and normal methods here either because they rely on the IP already being set. So the only way to do this would be digging deeper into the network stack and crafting your own packets, and that take admin permissions to be able to do that. A normal user wouldn't be able to do that.
In the real world, DHCP servers can be setup to do this themselves, and it's also managed by reserving ranges of IP addresses for static allocation, "ad-hoc allocation", and other ranges for dynamic allocation. Today, you would be hard pressed to get an IP that was in use already from the server.
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Well, that changes thing just a bit.
You cannot use a PING to see if something else is using the address. It requires a local IP address to work. After all, where would the target machine send the reply packet to if there's no IP?
I don't know how you're going to reliably do this. An ARP query is about the only way you can determine if an address is in use, but that's not guaranteed.
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Like I said, it's not guaranteed to work in all cases.
For example, if the other device that has the IP Address doesn't talk to anything before you get the same address, the ARP request can fail to tell you the IP is being used.
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Hi,
I have worked with and implemented a system service with the DHCP protocol. After you have received the DHCPACK you need to broadcast an ARP and make sure that no other node on the network has a claim to the address. You can use either the SendArp[^] or ResolveIpNetEntry2 function[^] to accomplish this.
I have a very complete understanding of the DHCP standards so if you have any questions feel free to contact me.
Best Wishes,
-David Delaune
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Thanks. I've used the SendArp function
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Eugene Pustovoyt wrote: Thanks. I've used the SendArp function
Nice.
Remember that DHCP is an honor system[^] and that there are no built-in security measures.
I researched and implemented a signed/encrypted DHCP protocol but it's completely non-standard and just something I was experimenting with. All of these old standards are garbage... and need to be replaced.
Oh... here's a pro tip: After you get your address offer and assign the address make sure to close the listening socket. Guess what happens if you leave a listening socket open for 12+ hours without reading the buffer? The socket buffers fill with 12 hours of whatever arrived at the listening port! I made this mistake in my first iteration. 
Best Wishes,
-David Delaune
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Thanks. I did.
In final I'll plan to used this code in the embedded application with hardware ethernet chip. It supports only a little count of sockets and I have to use a single socket for some sequence of tasks (DHCP, PING, SNTP etc).
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I'm having trouble with my system and checked system files, only to find that the file wininet.dll in some unpronouncable folder is corrupted and couldn't be repaired.
So I went to find that folder location, starting with Windows/Winsxs, only to find thousands of subfolders! Many of them appear to contain system dlls, and apparently lots of different versions of the same dlls.
I could understand the need for keeping different versions of some system files - but 20K folders of files???
Is it normal to have so many? Or may that be another symptom, or even the cause of the problems I'm having? Could this be the work of a virus or other kind of malware? Or is that the result of Windows working 'normally' for a couple of years?
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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I this this is fairly normal - I have just over 15,000 subfolders in mine, and I installed from scratch about a year ago. I was reading someone ranting about this the other day, but I can't remember where now.
I did find this though: Clean Up the WinSxS Folder | Microsoft Docs[^]
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Thanks, that article was rather informative - beyond the topic of the title. 
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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Looks like you have rediscovered DLL Hell[^]. It's a real thing and still a problem in 2020 with no end in sight.
Best Wishes,
-David Delaune
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What I mean is simple but a Google search on the above sentence returns everything that could possibly be senseless about it with the worst at the top.
Grammatically the "install" is the subject. And by the subject I mean nothing to do with "running" the direct object "program" but "installing" it; that's the active transitivity.
Compatibility mode as applied to an executable is determined by the OS on which one's running that executable, in this case, an installer. And I know there's an issue with what gets installed (doesn't "run").
The reason I ask, is because apparently Windows 10 and even Windows 8.1 and Windows 7 can elevate privileges for an installer ... or it can't. And I don't know what the criteria for automatic raising of this security level is nor do I really care. So, adding "best practices" into the mix, and obviously to avoid all the experimentation that has to be done as well as the cleaning up of any clean installing, a laborious tedium I can assure you, does anybody have any experience with this?
This is not a joke. I'm just trying to cut to the chase by avoiding confusion about whether the FAIL is Type I and Type II.
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I have no idea what you're really asking. Perhaps if you described the problem you're having?
You could run an installer in Compatibility Mode but it would pointless. Hell, Compatibility Mode isn't really even used any more unless the software you're running is ridiculously old.
Elevation is only required for installers because of the locations they write to in the file system and the registry. For security reasons today, normal don't have admin access to their machines. They're not able to write to protected parts of the file system, like C:\Windows, or anything under HKEY_LOCAL_MACHINE in the registry. Even Admins, by default, don't run anything using their admin privileges. You have to explicitly launch the app "as administrator", or the app has to request elevation from Windows, and then you're prompted to OK the requested operation.
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