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Brief Information about the September 98 CSIG Meeting

Windows Disk Drive Space Inventory by Bruce Arnold

This is the last of a multi part lecture on checking the space on your hard drive, etc. It's now a true Windows program. ('95, '98, 'NT')

Well, after three months we've finally made it! The program for this month is the third installment of the DSIZ window program that I have been promising. The program is based on a dialog box and has icons for selecting the path, starting the program, exiting, and bring up the notepad. In addition it has an edit box which allows manually typing in the computer path.

The most exciting part of this program is the fact that it uses threads. All windows programs use a main thread, but when the program needs to search the directories and calculate the space, it starts a second thread called a worker thread. This is a completely separate path of execution which occurs simultaneously with the main thread. This is just incredible and turns the resulting functionality from a "ho-hum" program into something quite professional!

Object: To inventory all file space used on a hard drive and display a sorted list of the top level sub directories and the total space occupied under each one. This is now a 32 bit application. Enhancements include the use of computed cluster sizes. (compiler: Microsoft VC++ 5.0 )

Based on the concepts developed in July and August, the program uses methods for determining disk space on a Windows 95 or 98 computer using the FAT32 disk structure. It also handles the NTFS file structure on a WindowsNT computer as well as various network systems.

"Random Access" questions start at 7:30 Tuesday night. See you there.

You can get the source code and the executable programs from links on C User Group: The source code and executables will be available directly from the ACGNJ ftp server:

See SOURCE CODE links below.

Sample Code:

UINT SearchThread( LPVOID pParam)   // Controlling function -- WORKER THREAD
    CDsizWDlg *mDlg = (CDsizWDlg *) pParam;

    process( 3, mDlg->m_cmds, mDlg);

    mDlg->m_Act.SetWindowText("  ");
    return 0;

int process(int argc, char *argv[], CDsizWDlg *myDialog)
    char root[_MAX_PATH] = "\\", mytime[20], mydate[20], estimated[20]="";
    char info[_MAX_PATH];

    if (argc==1) { puts(VERSION); return 1; }

    pDlg = myDialog;

    _strdate(mydate); _strtime(mytime);

    CDiskInfo Homedrive;		// save startup info
    CPathInfo Target(argv[1]);		// parse command line argument

    // Attempt to change to new drive and check that is was successful.
    if (Target.DKnumber <= 26) _chdrive(Target.DKnumber); // 1=A, 2=B, ...
    if (Target.DKnumber != _getdrive()) 
	    { puts("+++ Disk Selection Error +++\007"); return 2; }

    if (*Target.dir) strcpy(root,Target.dir);	// adjust root starting point

    CDiskInfo *Newdrive = new CDiskInfo();	// store info about new drive
    gCluster = Newdrive->Cluster;		// save value in global varable

		// cluster information is not accurate over microsoft networks.
    if (Newdrive->drive_type==DRIVE_REMOTE)
        gCluster = 4096;		// save value in global varable
    	strcpy(estimated," estimated");
    search(root);				// Do a RECURSIVE file search

    sprintf(out_buff," ------\t------------------------------------"); 	hprintf(out_buff,1);
    sprintf(out_buff,"%6ld\tMB_used in %ld files (%ld folders)",
			    megabytes(Gsize), gFileCount, gFolderCount	);  		hprintf(out_buff,1);
    sprintf(out_buff,"%6ld\tMB_total disk capacity",
			    (Newdrive->KBtotal >> 10));							    hprintf(out_buff,1);
    sprintf(out_buff,"%6ld\tMB_available (megabytes)",
			    (Newdrive->KBavail >> 10)	);		  					hprintf(out_buff,1);

    sprintf(out_buff," ------\t------------------------------------");	hprintf(out_buff,0);
    sprintf(out_buff," Date\t%s %s",	mydate, mytime	    );		    hprintf(out_buff,0);
    sprintf(out_buff," Clustr\t%ld bytes%s", gCluster, estimated);	    hprintf(out_buff,0);
    sprintf(out_buff," Type\t%s",	DTypes[Newdrive->drive_type]);	    hprintf(out_buff,0);
    sprintf(out_buff," Path\t%s",	root		    );		    		hprintf(out_buff,0);
    sprintf(out_buff," Info\t%s",	info                );		    	hprintf(out_buff,0);
    sprintf(out_buff," Drive\t%c:",	Newdrive->DKletter  );		    	hprintf(out_buff,0);

    delete Newdrive;			// Restore original settings.
    return 0;

"Random Access" questions start at 7:30 Tuesday night.


Source Code Files

For help, email me at b a r n o l d @ b l a s t . n e t
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