Windows API Learning

# Include <stdio. h>
# Include <windows. h>
# Include <time. h>
# Include <shlobj. h>
/*
Author: Yuan Wen
Time: 2007-12-28
E-mail: wenwen227@126.com
Debugging environment: Windows XP + Dev-C ++
Function: common Windows API learning practices
1. Folder selection dialog box
2. Implementation of folder Traversal
3. How to display large files
Brief Introduction:
Traverse all files and folders in a specified folder
If no folder is selected, the folder where the current file is located is retrieved.
Count the path and size of the Maximum File
Collect the latest files

*/
Void browse (char * strdir );
Unsigned int filecount = 0; // number of files
Unsigned int dircount = 0; // number of directories
Unsigned int maxsize = 0; // Maximum File Size
Char maxfilepath [max_path];
Char * selectfolder (char * pathname );
Int main (INT argc, char * argv [])
{
Char filepath [max_path];
Clock_t start, finish;
Selectfolder (filepath );
I = strlen (filepath );
If (0 = I) // if no return path exists in the selection box, the default path is used.
{
Strcpy (filepath, argv [0]);
I = strlen (filepath );
For (; filepath [I]! = '//'; I --);
Filepath [I] = '/0 ';
}
Filepath [I] = '//';
Filepath [I + 1] = '*';
Filepath [I + 2] = '/0 ';
Start = clock ();
Browse (filepath); // filepath
Finish = clock ();
Printf ("Time consumed: % DMS file count: % d directory count: % d/N", finish-start, filecount, dircount, maxsize );
Printf ("Maximum File Path:/n % s/n", maxfilepath );
System ("pause ");
Return 0;
}
/*
Struct _ win32_find_dataa {
DWORD dwfileattributes; file attributes
Filetime ftcreationtime; Creation Time
Filetime ftlastaccesstime; Access time
Filetime ftlastwritetime; modification time
DWORD nfilesizehigh; file size in bytes
DWORD nfilesizelow; Low file size in bytes
DWORD dwreserved0; reserved
DWORD dwreserved1; reserved
Char cfilename [max_path]; file name
Char calternatefilename [14]; Unknown
}
*/
Void browse (char * strdir)
{
Win32_find_dataa WFD;
Handle m_hfle = findfirstfile (strdir, & WFD );
DWORD errcod = 0;
Char fullpath [max_path];
If (invalid_handle_value! = M_hfle)
{
Do
{
Strcpy (fullpath, strdir );
Fullpath [strlen (fullpath)-strlen ("*")] = '/0'; // remove //*
Strcat (fullpath, WFD. cfilename );
If (WFD. dwfileattributes & file_attribute_directory)
{// Directory
If (WFD. cfilename [0]! = '.')
{
Strcat (fullpath ,"//*");
// Printf (fullpath );
Browse (fullpath); // recursively scan sub-files in this folder
Dircount ++;
}
}
Else // File
{
// Printf ("% s filesize = % d/N", WFD. cfilename, WFD. nfilesizelow );
Filecount ++;
If (WFD. nfilesizelow> maxsize)
{
Maxsize = WFD. nfilesizelow;
Sprintf (maxfilepath, "% s", fullpath );
}
}
} While (findnextfile (m_hfle, & WFD ));
}

If (invalid_handle_value! = M_hfle)
{
Findclose (m_hfle );
}
}

Char * selectfolder (char * pathname)
{
Browseinfo Bi; // controls the structure of properties in the Browse dialog box
Lpitemidlist Itemid;
// Char sdir [max_path]; // max_path: System constant, which indicates the maximum path length.
Char Foldername [max_path];
Memset (& BI, 0, sizeof (browseinfo); // Reset
Pathname [0] = '/0 ';
// Memset (sdir, 0, max_path );
Bi. hwndowner = NULL; // parent window handle
Bi. pszdisplayname = Foldername; // buffer for storing the path
Bi. lpsztitle = "how are you? "; // Dialog box title
Bi. ulflags = bif_returnonlyfsdirs; // only display the file system folder
Itemid = shbrowseforfolder (& BI );
If (Itemid = NULL)
Return pathname;
Shgetpathfromidlist (Itemid, pathname );
Return pathname;
}