Hi All

Working on Qt4.4.3, using my intel mac machine. What I am trying to do is,
I am selecting a file/folder using QFileDialog, and open that file in read write mode and writing that file with some other text, For this process I am using thread, I am selecting file in one class, and after selection i called thread , Using thread , I called some other class for writing on that selected file . For writing on the file, i want to run progressBar, till the writing completes, but its not working, i dont know why,

Qt Code: 
  1. void ClassWrite::fnWriteFile(FILE *fp, int nFillWith)
  2. {
  3.        unsigned long value = 0;
  4. 	int iProgressCounter = 0;
  5. 	long long llSizeRead = 0;
  6. 	unsigned long SizetoRead =0;
  7. 	long long SizeRead = 0;
  8. 	QFileInfo filename(m_FileName);
  9. 	llSizeRead = filename.size();
  10. 	QString strMessage = "";
  11. 	unsigned char *pBuffer = NULL;
  12. 	unsigned long dwBufferValue = 4*1024*1024;
  13. 	pBuffer = (unsigned char *)calloc(dwBufferValue,sizeof(unsigned char));
  14.      if(pBuffer == NULL)
  15. 	 return;
  16.  
  17. 	 strMessage = "WritingFile " + m_FileName;
  18. 	 emit ProgressMaximumValue(100);
  19. 	 qApp->processEvents(); 
  20.  
  21. 	while(llSizeRead>0)
  22. 	{
  23. 	  if(bStopFlag)
  24. 		break;
  25.  
  26.  
  27. 	 if(llSizeRead>dwBufferValue)
  28. 	 {
  29. 	    SizetoRead = dwBufferValue;
  30. 		value = ((SizetoRead/llSizeRead)*100);
  31. 		if(iProgressCounter == 0 || iProgressCounter == 100)
  32. 		{
  33. 	               emit SetProgressValue(strMessage,value);
  34. 		       qApp->processEvents();
  35. 		       memset(pBuffer,nFillWith,SizetoRead);
  36. 			fseek(fp, 0+SizeRead, SEEK_CUR);
  37. 			fwrite((void*)pBuffer,SizetoRead,1,fp);
  38. 			llSizeRead-=SizetoRead;
  39. 			SizeRead = SizetoRead;
  40. 			iProgressCounter = 0;
  41. 		 }
  42. 		iProgressCounter++;
  43. 	 }
  44. 	  else
  45. 	  {
  46. 		SizetoRead = llSizeRead;
  47. 		value = ((SizetoRead/llSizeRead)*100);
  48. 	    if(iProgressCounter == 0 || iProgressCounter == 100)
  49. 	    {
  50. 		    emit SetProgressValue(strMessage,value);
  51. 		    qApp->processEvents();
  52. 		    memset(pBuffer,nFillWith,SizetoRead);
  53. 		    fseek(fp, 0+SizeRead, SEEK_CUR);
  54. 		    fwrite((void*)pBuffer,SizetoRead,1,fp);
  55. 		    llSizeRead-=SizetoRead;
  56. 	            SizeRead = SizetoRead;
  57. 		    iProgressCounter = 0;
  58. 	    }
  59. 		 iProgressCounter++;
  60. 	  }
  61.  
  62.  
  63. 	}
  64.  
  65. 	    fflush(fp);
  66. 		if(pBuffer)
  67. 		{
  68. 		  free(pBuffer);
  69. 		  pBuffer = NULL; 
  70. 		}
  71. }
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Pls suggest me something