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Hi,
Why I am getting Object reference not set to an instance of an object when trying to read from registry? although I have a valid value there! The error is shown on this line:
connection_string = "Server=" + myapplication.GetValue("ServerHost").ToString() + ";";
and the value of ServerHost is 127.0.0.1
public string get_connectionstring(string system_key)
{
string connection_string;
RegistryKey myapplication_registry = Registry.LocalMachine.OpenSubKey("SOFTWARE\\myapplication", true);
RegistryKey system_registry = Registry.LocalMachine.OpenSubKey("SOFTWARE\\myapplication\\" + system_key, true);
connection_string = "Server=" + myapplication.GetValue("ServerHost").ToString() + ";";
connection_string += "Port=" + myapplication.GetValue("ServerPort").ToString() + ";";
connection_string += "Database=" + system_registry.GetValue("DatabaseName").ToString() + ";";
connection_string += "Uid=" + myapplication.GetValue("ServerUserID").ToString() + ";";
connection_string += "Pwd=" + cipher_utility.Decrypt<RijndaelManaged>(myapplication.GetValue("ServerPassword").ToString(), "{xxxxx-xxxx-xxxx-xxxx-xxxxxx}", "{xxxx-xxxx-xxxx-xxxx-xxxxx}") + ";";
connection_string += "Connect Timeout=" + myapplication.GetValue("ConnectTimeout").ToString()+ ";";
connection_string += "default command timeout=" + myapplication.GetValue("ConnectTimeout").ToString() + ";";
return connection_string;
}
Technology News @ www.JassimRahma.com
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Thanks guys,
I found the problem.
It was an issue with processor type.
The PC was 64bit and the exe was 32bit.
http://www.softnames.com
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I'm using VS2008 winforms over .net 3.5
I'm playing xvid encoded videos using AudioVideoPlayback. Works most of the time OK but sometimes the video freezes for several seconds before resuming at high speed to catch up. This happens on more than one PC (though all PCs are the same model).
It strikes me that the cause could be hard to track down unless someone has seen similar; any suggestions on what could cause this or any suggestions for reliable playing of xvid videos in winforms?
Thanks
A
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Hi! I'm newer to c# and I'm making a very simple game where I basically give AI directional instructions. The problem is, the commands keep looping! When I issue "TurnRight" I only want it to happen once, but the object doesn't stop spinning and non of my other commands, Idle, TurnLeft, etc, want to work. Help would be appreciated!!!!
Example:
case Ability.TurnRight:
switch (m_facing)
{
case World.Direction.North:
m_facing = World.Direction.East;
break;
case World.Direction.South:
m_facing = World.Direction.West;
break;
case World.Direction.East:
m_facing = World.Direction.South;
break;
case World.Direction.West:
m_facing = World.Direction.North;
break;
}
break;
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Okay, the problem here seems to be that whatever you have that triggers the switch isn't being set to a neutral state. In other words, you are in a situation where you have Ability.TurnRight set, and then you're switching based on m_facing, which sets a case that gets triggered again immediately. What I would do, immediately after your switch statement, reset the variable that contains Ability.TurnRight.
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Thanks for the response! Ok, that makes sense, but I thought the "break;" would prevent the command from continuing? (Still digging through the files)
And for more clarity I'm using a parent "MainChar" and child of "PacMan". I set up the array of "moves" (like exampled in my previous post) in the "MainChar" and I'm trying to issue the commands in "PacMan" so I can make him turn and move forward to collect all the pips before dying.
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No, break is a keyword that is required in a switch statement to say that a particular piece of code has "finished". It doesn't reset any variables. Let me demonstrate with a simple example:
bool finished;
int i = 0;
while (!finished)
{
switch (i)
{
case 0:
Console.WriteLine("Loopy");
break;
case 1:
finished = true;
break;
}
}As you can see, this will never finish because i is never set to 1.
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Thanks for the example. I'm starting to see what you mean by the "looping". To apply that to another ability, with the following example "Forward" PacMan will continue moving forward as long as the space in front of him is empty because the only check for success is that the space in "front" of him is empty, as determined by "LookForward"?
case Ability.Forward:
GameObject.Type objectTypeInDesiredPosition = LookForward();
if (objectTypeInDesiredPosition == GameObject.Type.Empty)
{
SetPosition(GetFowardPosition());
}
break;
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The issue of "involuntary recursion" is sometimes something you can't avoid having to handle: for example, events of certain WinForm Controls will be called when a Form is initialized, which may trigger side-effects that need to be stopped.
If you can't easily re-design your flow-of-control to eliminate this problem, then a "fix" is to:
0. first test to see if setting 'm_facing is triggering the recursion: create a boolean variable in Form scope:
private bool dontRecurse = false;
private void MyMethod(...)
{
if(dontRecurse) return;
dontRecurse = true;
switch(...)
{
case Ability.TurnRight:
switch (m_facing)
{
case World.Direction.North:
m_facing = World.Direction.East;
break;
case World.Direction.South:
m_facing = World.Direction.West;
break;
case World.Direction.East:
m_facing = World.Direction.South;
break;
case World.Direction.West:
m_facing = World.Direction.North;
break;
}
}
dontRecurse = false;
}Observe if this fixes the problem: if it does not then:
1. using the debugger: set a break-point in the code where you the first change occurs: in your case that would in one of the Switch/Case clauses before 'm_facing is set.
2. run your code making sure you trigger a case where you hit the break-point, and then single-step (F11) from the break-point to isolate what is triggering the re-execution of the the case statement.
When you have a clear understanding of what triggers the recursion, then re-design or use boolean flag as necessary.
«A man will be imprisoned in a room with a door that's unlocked and opens inwards ... as long as it does not occur to him to pull rather than push» Wittgenstein
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Thanks for the tips! I'll try to use this. ^^
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I have a base64 input("NjU0MDgA=") in a XML file which I am trying to convert to hexadecimal with the following code in C#:
ASCIIEncoding ascii = new ASCIIEncoding();
byte[] bytes = Encoding.ASCII.GetBytes("NjU0MDgA=");
string hex = BitConverter.ToString(bytes);
hex.Replace("-", String.Empty);
The 'hex' output is in the following format:
4D5459334D5445344D4467413D
However, required output should be in the format:
#44ff11 (example)
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I'm confused. NjU0MDgA= decoded is "65408" which is FF80 in hex.
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Apologies for any confusion.. I just gave sample values.
I am trying to get the values you mentioned programmatically.
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I use Encoding.GetString ( System.Convert.FromBase64String ( Source ) ), which yields TmpVME1EZ0E9 from your sample data.
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And hex should be "4E6A55304D4467413D"
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Thanks for your help. I was able to solve it. Following is what I ended up with:
byte[] decoded = Convert.FromBase64String("UUEncoded string to be decoded");
String value = ASCIIEncoding.ASCII.GetString(decoded);
int output = Convert.ToInt32(value);
// Convert int to hex format and reverse the byte
String.Format("{0:X02}{1:X02}{2:X02}", (output & 0x0000FF) >> 0, (output & 0x00FF00) >> 8, (output & 0xFF0000) >> 16);
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Hi,
I would like to anyone tried to knows where to get details on how to post sales into Sage 50 Accounting using C# and sData[^]
Thanks,
Jassim
Technology News @ www.JassimRahma.com
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Have some google foo[^] have you had a rat through their doco?
Never underestimate the power of human stupidity
RAH
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Hello...My self Swati. I'm from rajkot..
I want some extra report's name for my project..my project name is "BILLING SYSTEM"..so please suggest the report name for my project.which helps to improve my marks in project..thank you.. 
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How about:
[Course Instructor's Name] Off-Shore Account Report [Month] [Year]
Where you'd fill in the text in brackets above with the appropriate text data ?
No, seriously, how about just:
Billing System Report [report number] [Time-interval Year/Quarter/Month/Week/Day]
सौभाग्य
«A man will be imprisoned in a room with a door that's unlocked and opens inwards ... as long as it does not occur to him to pull rather than push» Wittgenstein
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I'm sorry, but what does this have to do with C#?
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You knocked on the wrong door.
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I'm developing a Smart Array (it's a request I cannot use a List of int that I know it's easier because I made both codes). I have done this class and below is the example of how I use it. The error is often in this line (153 from class):
// Ensure that the lock is released.
Monitor.Exit(array);
If I use a List nothing wrong happens just when I translate to an array. Thanks for your help.
SmartArray3.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace SmartArray
{
class SmartArray3
{
private int[] array;
private int size = 0;
private int count = 0;
public SmartArray3()
{
Resize(1);
}
public SmartArray3(int size)
{
this.size = size;
array = new int[this.size];
}
public bool Resize(int size)
{
try
{
if (array == null)
array = new int[size];
else
Array.Resize(ref array, size);
this.size++;
return true;
}
catch
{
return false;
}
}
private void add(int value)
{
try
{
if (array == null)
{
this.size = 1;
Resize(this.size);
array[0] = value;
this.count++;
}
else
{
if (this.count == (this.size - 1))
{
this.size *= 2;
this.Resize(this.size);
}
if ((this.count - 1) < 0)
array[0] = value;
else
array[this.count - 1] = value;
this.count++;
}
}
catch (Exception ex)
{
Console.Write(ex.ToString());
throw new System.IndexOutOfRangeException("Index out of Range.");
}
}
public void Add(int value)
{
Monitor.Enter(array);
try
{
if (array == null)
{
this.size = 1;
Resize(this.size);
array[0] = value;
this.count++;
}
else
{
if (this.count == (this.size - 1))
{
this.size *= 2;
this.Resize(this.size);
}
if ((this.count - 1) < 0)
array[0] = value;
else
array[this.count - 1] = value;
this.count++;
}
}
finally
{
Monitor.Exit(array);
}
}
public bool TryAdd(int value)
{
if (Monitor.TryEnter(array))
{
try
{
if (array == null)
{
this.size = 1;
Resize(this.size);
array[0] = value;
this.count++;
}
else
{
if (this.count == (this.size - 1))
{
this.size *= 2;
this.Resize(this.size);
}
if ((this.count - 1) < 0)
array[0] = value;
else
array[this.count - 1] = value;
this.count++;
}
}
finally
{
Monitor.Exit(array);
}
return true;
}
else
{
return false;
}
}
public int Get(int index)
{
try
{
return array[index];
}
catch (IndexOutOfRangeException ex)
{
throw new System.IndexOutOfRangeException("Index out of range");
}
}
}
}
Code for called the Class:
private static int threadsRunning = 0;
private SmartArray3 sa = new SmartArray3();
private List times;
private static string[] titles ={
"Add ", "Add failed ", "TryAdd succeeded ", "TryAdd failed "};
private static int[][] results = new int[3][];
private void newTest()
{
for (int i = 0; i < 3; i++)
{
Thread t = new Thread(ThreadProc);
t.Start(i);
Interlocked.Increment(ref threadsRunning);
}
}
private void ThreadProc(object state)
{
times = new List();
DateTime finish = DateTime.Now.AddSeconds(10);
Random rand = new Random();
int[] result = { 0, 0, 0, 0};
int threadNum = (int)state;
while (DateTime.Now < finish)
{
Stopwatch sw = Stopwatch.StartNew();
int what = rand.Next(250);
int how = rand.Next(25);
if (how < 16)
{
try
{
sa.Add(what);
result[(int)ThreadResultIndex.AddCt] += 1;
times.Add(sw.Elapsed.TotalMilliseconds);
}
catch
{
result[(int)ThreadResultIndex.AddFailCt] += 1;
}
}
else
{
if (sa.TryAdd(what))
{
result[(int)ThreadResultIndex.TryAddSucceedCt] += 1;
}
else
{
result[(int)ThreadResultIndex.TryAddFailCt] += 1;
}
}
sw.Stop();
}
results[threadNum] = result;
if (0 == Interlocked.Decrement(ref threadsRunning))
{
StringBuilder sb = new StringBuilder(
" Thread 1 Thread 2 Thread 3 Total\n");
for (int row = 0; row < 4; row++)
{
int total = 0;
sb.Append(titles[row]);
for (int col = 0; col < 3; col++)
{
sb.Append(String.Format("{0,4} ", results[col][row]));
total += results[col][row];
}
sb.AppendLine(String.Format("{0,4} ", total));
}
Console.WriteLine(sb.ToString());
}
}
private enum ThreadResultIndex
{
AddCt,
AddFailCt,
TryAddSucceedCt,
TryAddFailCt
}
Federico Navarrete
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