C#

Meysam Tolouee wrote:

nd you are not going to help me.

private static bool[] _numbers;

static void Main(string[] args)
{
    var sw = new Stopwatch();
    sw.Start();
    Run();
    sw.Stop();
    Console.WriteLine("Milliseconds run: " + sw.ElapsedMilliseconds);
    Console.WriteLine("Primes: " + _numbers.Count(i => i));
    Console.ReadLine();
}

private static void Run()
{
    const int count = 2000000;
    _numbers = new bool[count];
    for (int i = 2; i < count; i++)
        _numbers[i] = true;

    int baseCounter = 1;

    while (baseCounter < count)
    {
        do
        {
            baseCounter++;
            if (baseCounter == count) return;
        } while (!_numbers[baseCounter]);

        int counter = baseCounter << 1;
        while (counter < count)
        {
            _numbers[counter] = false;
            counter += baseCounter;
        }
    }

long sum = 0;
for (int i = 0; i < _numbers.Length - 1; i++)
{
   if (_numbers[i])
      sum += i;
}

static void Main(string[] args)
    {
        var sw = new Stopwatch();
        sw.Start();
        Run();
        sw.Stop();
        Console.WriteLine("Milliseconds run: " + sw.ElapsedMilliseconds);
        Console.WriteLine("Primes: " + _numbers.Count(i => i));
        var sum = 0;
        for (int i = 2; i < _numbers.Count(); i++)
            if (_numbers[i]) sum += i;
        Console.WriteLine("Sum of Primes: " + sum.ToString("n0"));

        Console.ReadLine();
    }

toBeH_S wrote:

SendMessageW( hwn, WM_GETTEXT, (IntPtr)sSize, sbTitle);

StringBuilder title = new StringBuilder();

Int32 sSize = SendMessage((int)hWnd, WM_GETTEXTLENGTH, 0, 0).ToInt32();

// If the return is 0, there is no title. 
if (sSize > 0)
{
        sbTitle = new StringBuilder(sSize + 1);
        SendMessage(hwnd,( int)WM_GETTEXT, sbTitle.Capacity, sbTitle);

}
return sbTitle.ToString();

Rage wrote:

What is the following code doing:

 

C#

StringBuilder title = new StringBuilder();
 
Int32 sSize = SendMessage((int)hWnd, WM_GETTEXTLENGTH, 0, 0).ToInt32();
 
// If the return is 0, there is no title. 
if (sSize > 0)
{
        sbTitle = new StringBuilder(sSize + 1);
        SendMessage(hwnd,( int)WM_GETTEXT, sbTitle.Capacity, sbTitle);
 
}
return sbTitle.ToString();

hwnd : handle of the printer name combobox in PrintDialog of Acrobat.

int sSize=SendMessage((int)hwnd, WM_GETTEXTLENGTH, 0,0),ToInt32();

sbTitle = new StringBuilder( sSize + 1);

SendMessage(hwnd, (int)WM_GETTEXT, sbTitle.Capacity, sbTitle);

Rage wrote:

There could also be a Unicode problem.

if ( isWindowUnicode(hwnd)) {
        StringBuilder title = new StringBuilder();

         Int32 sSize = SendMessageW((int)hWnd, WM_GETTEXTLENGTH, 0, 0).ToInt32();

       // If the return is 0, there is no title.
       if (sSize > 0)
       {
                  sbTitle = new StringBuilder(sSize + 1);
                  SendMessageW(hwnd,( int)WM_GETTEXT, sbTitle.Capacity, sbTitle);

       }
      return sbTitle.ToString();
}

toBeH_S wrote:

What is the following code doing:

// Visual Studio 2012 RC
// Framework 4.5
// WinForms: one Form with one Button it named 'Permute
//
// build a List of Types to permute
private static List<Type> OkayCollectionTypes = new List<Type>()
{
    typeof(List<>),
    typeof(Stack),
    typeof(Queue),
    typeof(LinkedList<>)
};

// create some samples to play with
private static List<int> IntList = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

private static Stack AStack = new Stack(IntList as IList);

// test stub for Permute function
private static dynamic Permute(dynamic permuteTarget)
{
    Type currentType = permuteTarget.GetType();

    // Note: we cannot use Type.GetType() here
    // an error will be thrown
    // see comments in the BtnPermuteClick EventHandler

    if(OkayCollectionTypes.Contains(currentType))
    {
        MessageBox.Show("okay : Type = " + permuteTarget.ToString());
    }
    else
    {
        return null;
    }

    // at this point we create a new instance
    // of 'permuteTarget that we permutate ?
    // to be explored ...
    return (permuteTarget);
}

private void BtnPermuteClick(object sender, EventArgs e)
{
    // this works
    // although it has no effect on AStack's contents
     AStack = Permute(AStack);

    // this will not work
    // because the type of IntList is:
    // System.Collections
    //  .Generic.List`1
        // [
            //[System.Int32,
            // ... snip ...
            //PublicKeyToken=b77a5c561934e089]
        // ]

    // if we tried to use Type.GetType() in the Permute method
    // an error would be thrown like this:
    //'System.Collections.Generic.List<int>' does not contain a definition for 'Type'

    // var mutatedList = Permute(IntList);
}

> ? currentType is IList
    false
    > ? currentType is List<int>
    false

    * the following edited for brevity
    > ? currentType.GetType()
    {Name = "RuntimeType" FullName = "System.RuntimeType"}
        [System.RuntimeType]: {Name = "RuntimeType" FullName = "System.RuntimeType"}
        base {System.Reflection.MemberInfo}: {Name = "RuntimeType" FullName = "System.RuntimeType"}
        AssemblyQualifiedName: "System.RuntimeType, ... snip ... PublicKeyToken=b77a5c561934e089"
        BaseType: {Name = "TypeInfo" FullName = 
        GenericParameterPosition: 'currentType.GetType().GenericParameterPosition' threw an exception of type 'System.InvalidOperationException'
        GenericTypeArguments: {System.Type[0]}
        GUID: {97e69551-7329-39c5-ba61-2ca4b573e0e5}
        IsClass: true
        IsGenericType: false
    UnderlyingSystemType: {Name = "RuntimeType" FullName = "System.RuntimeType"}

Skippums wrote:

1. I cannot figure out how to modify the contents of an IEnumerable object.

for (int i = 0; i < list.Count; i++)
{
  list[i] = tempArray[indexes[j++]];
}

Pete O'Hanlon wrote:

Note that this isn't possible for something like a LinkedList.