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I need a playlist creater aplication using Pvs.Av Player.
In my form 4 buttons added.Frist one Open Files
second one Save playlist Third one Open playlist Fourth one Delete Playlist.
When i am clicking open files button should be add some video files in my playlist,and show file name and path time and date show in data grid view.
When i am clicking save button to show save dialog box and save playlist with file extention *.pll
when i am double clicking in file name in data grid to play the video in preview panel.
modified 22-Aug-19 2:16am.
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This is not a job site; we do not hire out here.
Even if we did, we'd need a whole load more information than "I need a programmer" - that's like saying "I need a surgeon": what type? Brain? Bone? Heart? Transplant? Cosmetic?
What do you need done?
If you want someone to write your code, you have to pay - I suggest you go to Freelancer.com and ask there.
But be aware: you get what you pay for. Pay peanuts, get monkeys.
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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sorry,It was caused by my ignorance.
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How can I do this Excel's MOD formula in C#:
=MOD(-1.779406909, 2 * PI())
Thanks,
Jassim
www.softnames.com
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You put % between the numbers.
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I tried that..
Excel returns
4.503778398
This is the figure I am trying to achieve
But...
double bearing4 = Math.Floor(-1.7794 / (2 * Math.PI));
returns -1
and this:
double bearing4 = -1.779406909 % (2 * Math.PI);
returns: -1.779406909
www.softnames.com
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Modulo and negative numbers make an explosive mix. See the last table in Modulo operation - Wikipedia[^].
One common trick is to do something like
result = (a + n*b) % b where n is some "sufficiently large" integer.
Cheers,
Peter
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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double bearing4 = (-1.779406909 + 2 * Math.PI) % Math.PI;
It returns 1.362 which is different that Excel
www.softnames.com
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Jassim Rahma wrote: which is different that Excel
which is because you're calculating something different.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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MOD in Excel is a true Modulus: % in C# is a remainder, and the two are not the same: Mod and Remainder are not the Same – Rob Conery[^]
What you need is to write a modulus method:
private double Mod(double a, double b)
{
return a - b * Math.Floor(a / b);
}
Call that, and you'll get the answer you're expecting.
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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Yes Yes Yes
Thank you so much
www.softnames.com
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You're welcome!
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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Also useful background: Eric Lippert "What’s the difference? Remainder vs Modulus" [^]
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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what I use:
using System;
using System.Runtime.InteropServices.WindowsRuntime;
namespace Utilities
{
public static class MathExtensions
{
public static double ModT<T>(this T i1, T i2)
{
double v1 = i1.GetDouble();
double v2 = i2.GetDouble();
return v1 - v2 * Math.Floor(v1 / v2);
}
public static double ModT1T2<T1, T2>(this T1 i1, T2 i2)
{
double v1 = i1.GetDouble();
double v2 = i2.GetDouble();
return v1 - v2 * Math.Floor(v1 / v2);
}
public static double GetDouble<T>(this T i1)
{
double v1;
try
{
v1 = Convert.ToDouble(i1);
}
catch (InvalidCastException iex)
{
throw new InvalidCastException($"type {typeof(T)} cannot be cast to double: {iex.Message}");
}
catch (FormatException fex)
{
throw new FormatException($"type {typeof(T)} cannot be used: {fex.Message}");
}
catch (OverflowException oex)
{
throw new OverflowException($"type {typeof(T)} result is an overflow: {oex.Message}");
}
return v1;
}
}
} Tests:
double dbl = -1.779406909.ModT(2 * Math.PI);
double int1 = 221.ModT(20);
double sngl = 102.0f.ModT(20.0f);
double deci = 102.0m.ModT(20.0m);
double intdecicombo = 100.0.ModT1T2(34.56m);
double dbl2 = 100.0.ModT(34.56);
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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BillWoodruff wrote:
catch (InvalidCastException iex)
{
throw new InvalidCastException($"type {typeof(T)} cannot be cast to double: {iex.Message}");
} If you're going to wrap an exception, you should pass the wrapped exception as the inner exception.
You should probably review the error messages as well. For example, it might be fine to use the given type, but not the specified value.
catch (InvalidCastException iex)
{
throw new InvalidCastException($"Type {typeof(T)} cannot be cast to double: {iex.Message}", iex);
}
catch (FormatException fex)
{
throw new FormatException($"Value '{i1}' of type {typeof(T)} cannot be converted to a double: {fex.Message}", fex);
}
catch (OverflowException oex)
{
throw new OverflowException($"Value '{i1}' of type {typeof(T)} is too large for a double: {oex.Message}", oex);
} You can also eliminate the InvalidCastException by adding a generic type constraint, since the documentation[^] says it's only thrown if the value to convert doesn't implement IConvertible :
public static double ModT<T>(this T i1, T i2) where T : IConvertible { ... }
public static double ModT1T2<T1, T2>(this T1 i1, T2 i2) where T1 : IConvertible where T2 : IConvertible { ... }
public static double GetDouble<T>(this T i1) where T : IConvertible { ... }
"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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Well, there is no code I write you cannot improve, and I am happy to see the improvements, no matter how ephemeral
You are already aware, I'm sure, of the long-standing issue in constraining generic parameters to numeric Types. If you're going to constrain, might as well go for broke:
where T:
struct,
IComparable,
IComparable<T>,
IConvertible,
IEquatable<T>,
IFormattable
Note:
var c1dbl = 'z'.ModT('a'); // invalid cast error
Of course, that's somewhat ironic since you can do this:
int c1int = 'z' % 'a'; // returns #25
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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That's an annoying restriction on the char type. All of the floating-point IConvertible members throw an InvalidCastException . But casting to a floating-point type, either explicitly or implicitly, works.
char c = '*';
double a = (double)c;
double b = Convert.ToDouble(c); Reference Source[^]
"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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Would it be the language we love without these quirks
Seems to me we could have had INumericType ... IIntType ... IFloatType constraints ... by now ... given the frequency of posts about the necessity for these.
cheers, Bill
«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot
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Looks like it's part of a much larger discussion that's going to take a while to make it into the language (if it ever does):
Champion "Type Classes (aka Concepts, Structural Generic Constraints)" · Issue #110 · dotnet/csharplang · GitHub[^]
Meanwhile, you can "fake" it by using Jon Skeet's generic operators from the MiscUtil project:
Generic Operators[^]
It hasn't been updated since 2009, but the concept still works.
For example:
using System.Linq.Expressions;
public static class GenericOperators<T>
{
public static readonly Func<T, T, T> Add = Create(Expression.Add);
public static readonly Func<T, T, T> Subtract = Create(Expression.Subtract);
public static readonly Func<T, T, T> Multiply = Create(Expression.Multiply);
public static readonly Func<T, T, T> Divide = Create(Expression.Divide);
private static Func<T, T, T> Create(Func<Expression, Expression, BinaryExpression> body)
{
try
{
Type typeT = typeof(T);
var left = Expression.Parameter(typeT, "left");
var right = Expression.Parameter(typeT, "right");
if (typeT.IsEnum)
{
Type enumType = Enum.GetUnderlyingType(typeT);
var x = Expression.Convert(left, enumType);
var y = Expression.Convert(right, enumType);
Expression op = body(x, y);
if (op.Type == enumType) op = Expression.Convert(op, typeT);
return Expression.Lambda<Func<T, T, T>>(op, left, right).Compile();
}
return Expression.Lambda<Func<T, T, T>>(body(left, right), left, right).Compile();
}
catch (InvalidOperationException ex)
{
string message = ex.Message;
return delegate { throw new InvalidOperationException(message); };
}
catch (ArgumentException ex)
{
string message = ex.Message;
return delegate { throw new InvalidOperationException(message); };
}
}
} Of course, it wouldn't help much in this case, because you'd still need to convert to a double or decimal to call Math.Floor .
"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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how to fix invalid token error in c# application in visual studio ?
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We can't tell you - 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. And you haven't given us anything to work with!
Start by looking at the line that Visual Studio is complaining about - if you double click the error message in the Errors pane it will "jump" right to it - and check for any red lines underneath stuff.
Then look at the lines above and below - quite often a problem shows up because you did something wrong earlier and VS only just noticed.
If you can't spot the problem, then show us the relevant code fragment: the line VS is complaining about, plus a dozen lines above and below for context. Be sure to tell us exactly which line teh problem is found on, and any other info that you think might help.
The better your question, the better our response - so help us to 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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Learn how to use the debugger.
".45 ACP - because shooting twice is just silly" - JSOP, 2010 ----- You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 ----- When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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I have been working on a small application to get fingerprints after 3 scanned. I used the ZKFingerSDK and when trying to get the register finger prints it brings the image back as black. I am using the ZK9500 device
This is what I tried:
if (RegisterCount >= REGISTER_FINGER_COUNT && !bIdentify)
{
RegisterCount = 0;
ret = GenerateRegisteredFingerPrint();
if (zkfp.ZKFP_ERR_OK == ret)
{
ret = AddTemplateToMemory();
if (zkfp.ZKFP_ERR_OK == ret)
{
string fingerPrintTemplate = string.Empty;
zkfp.Blob2Base64String(newRegTmp, cbCapTmp, ref fingerPrintTemplate);
newRegTmp = zkfp.Base64String2Blob(fingerPrintTemplate);
Bitmap bmp2;
MemoryStream ms2 = new MemoryStream();
BitmapFormat.GetBitmap(newRegTmp, mfpWidth, mfpHeight, ref ms2);
bmp2 = new Bitmap(ms2);
this.pictureBox1.Image = bmp2;
Console.WriteLine("finger print" + fingerPrintTemplate);
textRes.AppendText("merged " + fingerPrintTemplate + "\n");
}
}
}
private int GenerateRegisteredFingerPrint()
{
return fpInstance.GenerateRegTemplate(RegTmps[0], RegTmps[1], RegTmps[2], newRegTmp, ref cbRegTmp);
}
private int AddTemplateToMemory()
{
return fpInstance.AddRegTemplate(iFid, newRegTmp);
}
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You've already got this posted in QA: don't shotgun the site with the same thing, it wastes effort and that annoys people.
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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