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We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action.
Try it yourself, you may find it is not as difficult as you think!
If you meet a specific problem, then please ask about that and we will do our best to help. But we aren't going to do it all for you!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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well I know that if I make a web service and a console application and connect them by reference it automatically generate and send requests as soap but I don't know how to define variables send it to the server and do process on them on server side and send the result to the client side
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Hi,
I am looking to store my data that is not in a fixed format in an array or list but as array is of fixed size so cant use that, list provides flexibility but it doesnt comes with multi dimensions option like array does..
I had a data like:
"Acids", "A1", "A2", "A3" - this could grow to ph4 till ph 10 depends
"Sulphur" "S1", "S2", - this could grow to ph4 till ph 0 depends
"Carbon" "c1", C2" can grow depends
also after storing it in the list i also need to retrieve in a way that in a loop i should get first Acids then all its sub components that is A1, A2, A3, once done then move to Sulphur and get its corresponding components.
Please can anyone suggest anything on how to best deal with this.
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How about a Dictionary<string, List<string>> ?
Dictionary with Single Key and Multiple Values Example in C#. See https://repl.it/CY3S/1 to run example code online. · GitHub[^]
Eg:
var data = new Dictionary<string, List<string>>(StringComparer.OrdinalIgnoreCase)
{
["Acids"] = new List<string> { "A1", "A2", "A3" },
["Sulphur"] = new List<string> { "S1", "S2" },
["Carbon"] = new List<string> { "C1", "C2" },
};
if (!data.TryGetValue("Acids", out var acids)) acids = data["Acids"] = new List<string>();
acids.Add("A4");
if (data.TryGetValue("Sulphur", out var sulphur)) sulphur.Remove("S1");
foreach (KeyValuePair<string, List<string>> pair in data)
{
Console.WriteLine(pair.Key);
foreach (string value in pair.Value)
{
Console.WriteLine(value);
}
Console.WriteLine();
}
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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A list of lists is probably as close as you can get. Though it seems to me a lot less flexible, another option to consider is a dictionary where the key is an object or struct that stores the array subscripts. Since I suspect such a dictionary could get really ugly really fast, I would be inclined to use a list of lists.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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I am making a Windows form program, where I use the AxMSTSCLib libery, the make a RDP session. Everything works fine, but I am having issues making some of the event handlers work, especially the "OnLogonError" event. It is not called as expected, when I type in wrong credentials.
I start out with this piece of code (have also tried the AxMsRdpClient8NotSafeForScripting version):
AxMsRdpClient9NotSafeForScripting RDP = new AxMsRdpClient9NotSafeForScripting();
RDP.OnLogonError += new AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEventHandler(this.OnLogonError);
RDP.OnConnected += new EventHandler(axMsRdpClient2_OnConnected);
- and then later:
private void OnLogonError(object sender, AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEvent e)
{
switch (e.lError)
{
case 0:
MessageBox.Show("The logon failed because the logon credentials are not valid.");
break;
default:
MessageBox.Show("An unknown error.");
break;
}
}
Private void axMsRdpClient2_OnConnected(object sender, EventArgs e)
{
MessageBox.Show("Connected!!!");
}
Do anyone experienced this problem? I have searched the Internet, but nothing useful regarding that some events are not called.
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RDP.OnLogonError += new AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEventHandler(this.OnLogonError);
RDP.OnConnected += new EventHandler(axMsRdpClient2_OnConnected);
You put this.OnLogonError and axMsRdpClient2_OnConnected for both parameter functions. Try to quit this (or base, if you call this in the Class) near the callback, maybe it works!
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Thanks for your answer Matias, but I am not sure what you mean (near callback)? I have tried the line "RDP.OnLogonError += new AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEventHandler(OnLogonError);" (without "this"), but still same result. I cannot use base, because the line is in the function, and not defined in the class.
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If you put a Breakpoint in the CallFunction, can you debug it?
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If am putting a breakpoint on the first line, where I create the "AxMsRdpClient9NotSafeForScripting", the it goes though my event lines, further down where I connect to RDP, and then I expect to come down to my "private void OnLogonError(object sender, AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEvent e)" due to bad credentials, but it just dosent happen. It's like I have never defined the event call in the first place, so it just ignores it?
Also tried putting a breakpoint in the "private void OnLogonError(object sender, AxMSTSCLib.IMsTscAxEvents_OnLogonErrorEvent e)", but still I do not get to the error event.
modified 12-Sep-18 17:19pm.
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After further testing, I found out that if connecting to a Windows 2003 server, the event is entered. But not when connecting to Win7 and newer and Win2008R2 and newer. I wonder if Microsoft removed the event functionality in newer systems?
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I have a MySQL database with a table that has a TIMESTAMP field. All I need to do is get that value into a DateTime variable in C#.
I have a DataRow containing the timestamp value in column TimeStampCol (or it could be a datareader, same difficulty arises).
Have tried the following: (datarow in variable DR )
DateTime MyVar;
MyVar = (DateTime)DR["TimeStampCol"]);
MyVar = Convert.ToDateTime(DR["TimeStampCol"]);
MyVar = new DateTime(1970, 1, 1, 0, 0, 0, 0).AddSeconds(Double.Parse(DR["TimeStampCol"].ToString())).ToLocalTime()
I understand that the Timestamp is being returned as a long integer number, so am not surprised by the first two errors.
There's probably a .Net function to do this, but I can't find it... surely this should be a trivial operation?
Thanks!
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My question is how to convert the returned Timestamp into a DateTime value in C# ... I can handle the values fine within MySql.
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Look at the documentation for C# DateTime types. It explains which conversions it accepts (e.g. strings, seconds, [D,M,Y] etc.). If it cannot accept the value returned from MySQL then you will need to convert that value into one that it can handle.
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The following statement in the article that you cited tells me enough to give a reasonable hint.
Quote: Conversion of TIME or DATETIME values to numeric form (for example, by adding +0) results in a double-precision value with a microseconds part of .000000
The TIMESTAMP is a double-precision floating point number, which is interpreted as follows.
- The fractional part, if nonzero, is the number of microseconds in the time.
- The integral part is always present, is a Unix time.
With these two bits of information, you can use the following function, which you can implement as a static method, to convert the Unix timestamp.
public static DateTime UnixTimeStampToDateTime( double unixTimeStamp )
{
System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddSeconds( unixTimeStamp ).ToLocalTime();
return dtDateTime;
}
The above is taken from the accepted answer to How can I convert a Unix timestamp to DateTime and vice versa?. Though I haven't tested it, I suspect it is at least essentially correct.
Since the input is double precision, you can amend it to handle the decimal part, which should be converted to ticks, where one tick is equal to 100 nanoseconds. The resulting tick count should then be added to the .Ticks property on the DateTime to get the final answer.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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I think this message was meant for the OP rather than me.
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You are correct. Thank you for calling that to my attention!
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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The following statement in the article that you cited tells me enough to give a reasonable hint.
<blockquote class="quote"><div class="op">Quote:</div>Conversion of TIME or DATETIME values to numeric form (for example, by adding +0) results in a double-precision value with a microseconds part of .000000</blockquote>
The TIMESTAMP is a double-precision floating point number, which is interpreted as follows.
<ul>
<li>The fractional part, if nonzero, is the number of microseconds in the time.</li>
<li>The integral part is always present, is a Unix time.</li>
</ul>
With these two bits of information, you can use the following function, which you can implement as a static method, to convert the Unix timestamp.
<pre>public static DateTime UnixTimeStampToDateTime( double unixTimeStamp )
{
System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddSeconds( unixTimeStamp ).ToLocalTime();
return dtDateTime;
}
The above is taken from the accepted answer to How can I convert a Unix timestamp to DateTime and vice versa?. Though I haven't tested it, I suspect it is at least essentially correct.
Since the input is double precision, you can amend it to handle the decimal part, which should be converted to ticks, where one tick is equal to 100 nanoseconds. The resulting tick count should then be added to the .Ticks property on the DateTime to get the final answer.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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Hello,
I'm trying to address a windows library from within my C#Code.
Want to search a windows library from within C# and return the result to my application.
Just don't know how to begin...
Anyone some ideas?
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This is not a good question - we cannot work out from that little what you are trying to do.
Remember that we can't see your screen, access your HDD, or read your mind - we only get exactly what you type to work with.
So what are you trying to search a "Windows library" for? What results are you expecting?
Please, try to explain in as much detail as you can what you are trying to achieve, what you have tried, where you are stuck - the better the information you give us, the better we can help you!
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Microsoft have some C++ examples available:
Using Libraries in your Program | Microsoft Docs[^]
There doesn't seem to be a C# wrapper available. You can either write your own in Managed C++, or P/Invoke the relevant functions.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I am new to programming and learning on youtube. I have question in following code:
using System;
class test
{
public static void Main()
{
int i = 0;
abc(ref i);
Console.WriteLine(i);
Console.ReadLine();
}
public static int abc(ref int j)
{
j = 100;
return j;
}
}
After running this, I am getting answer 100.
But when I change return statement as "return 0", again answer is 100. May I know why? If I am returning 0, method should return 0 value to variable i no? I am new to programming so please explain me in very details. Thank you so much.
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It has to do with variable scope. You are passing by Reference which is different than passing by value. You are basically allowing the function ABC to modify the actual variable i.
For this to act as you expect you need to assign the return value from ABC to i like this: i = abc(i) and remove the Ref keyword. There is a little more to it but see below.
Look here at a StackOverflow answer[^] and here at the Microsoft Ref keyword.[^]
Jack of all trades, master of none, though often times better than master of one.
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Thank you so much for your reply. But my question is that when i write statement "return j", it is returning value of j. This part I got but when I write "return 0", why it is not giving answer as 0? As I am new, I am not getting this. Please explain me in a little bit detail. Thank you
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