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POHow to use "this" in a thread!
 

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  1. POHow to use "this" in a thread!
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    <p>I am trying to call my static function using a separate thread, I have in my function something like <code>this-&gt;listBox1-&gt;Items-&gt;Add(s);</code>. The compiler shows that I can't use <code>this</code> inside a static function. I tried to make my function non-static (i.e remove <code>static</code> keyword) but when I did that, again the compiler shows two errors which are:</p> <blockquote> <p>Error 2 error C3350: 'System::Threading::ThreadStart' : a delegate constructor expects 2 argument(s) c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 116</p> <p>Error 1 error C2276: '&amp;' : illegal operation on bound member function expression c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 116</p> </blockquote> <hr> <p><strong>Edit</strong>:</p> <p>The function:</p> <pre><code>void ScanMyDir(String^ SourceDir) { array &lt;String^&gt; ^fileEntries = Directory::GetFiles(SourceDir); for each (String^ fileName in fileEntries) this-&gt;Form1-&gt;listBox1-&gt;Items-&gt;Add(fileName); array&lt;String^&gt; ^SubDirEntries = Directory::GetDirectories(SourceDir); for each (String^ subdir in SubDirEntries) if ((File::GetAttributes(subdir) &amp; FileAttributes::ReparsePoint)!= FileAttributes::ReparsePoint) ScanMyDir(subdir); } </code></pre> <p>Way to call it:</p> <pre><code>void button1_Click(System::Object^ sender, System::EventArgs^ e) { Thread ^thr1 = gcnew Thread(gcnew ParameterizedThreadStart(this,&amp;Form1::ScanMyDir)); thr1-&gt;Start("c:\\"); } </code></pre> <p>Modification on Form load:</p> <pre><code>void Form1_Load(System::Object^ sender, System::EventArgs^ e) { System::Windows::Forms::Control::CheckForIllegalCrossThreadCalls = false; } </code></pre> <p>The new errors :( :</p> <blockquote> <p>Error 5 error C3352: 'void testScan::Form1::ScanMyDir(System::String ^)' : the specified function does not match the delegate type 'void (System::Object ^)' c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 117</p> <p>Error 1 error C2273: 'function-style cast' : illegal as right side of '->' operator c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 105</p> <p>Error 2 error C2227: left of '->listBox1' must point to class/struct/union/generic type c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 105</p> <p>Error 3 error C2227: left of '->Items' must point to class/struct/union/generic type c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 105</p> <p>Error 4 error C2227: left of '->Add' must point to class/struct/union/generic type c:\users\ahmed\documents\visual studio 2010\projects\testscan\testscan\Form1.h 105</p> </blockquote>
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    1. USildjarn
    1. USAan
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    1. CONot really your current problem, but it looks like you're trying to write to a GUI object from a non-GUI thread, which is generally considered a no-no...
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      1. POHow to use "this" in a thread!
      1. USforsvarir
    2. COPost your code!
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      1. POHow to use "this" in a thread!
      1. USDan Puzey
    3. COYou should show us the function declaration, line 116 , and tell us the scope (Where the function is declares (class declaration) )
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      1. POHow to use "this" in a thread!
      1. USYochai Timmer
 

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