The choice of copying files in a Windows program

Recently, you need to copy a large number of small files under Windows (more than 100,000 levels). Write some copy files of small program, unexpectedly found different choice, copy speed has a difference!

The existing test data: 1500+ small files, the total size of about 10M. Copies are now made in different ways. ：

Scenario 1: Calling SHFileOperation

[CPP]View PlainCopy

2. BOOL Cutility::copyfolder (lpctstr lpszfrompath,lpctstr lpsztopath)
4. {
6. size_t nlengthfrm = _tcslen (Lpszfrompath);
8. TCHAR *newpathfrm = new tchar[nlengthfrm+2];
10. _tcscpy (Newpathfrm,lpszfrompath);
12. NEWPATHFRM[NLENGTHFRM] = ' + ';
14. NEWPATHFRM[NLENGTHFRM+1] = ' + ';
18. Shfileopstruct Fileop;
20. ZeroMemory (void*) &fileop,sizeof (SHFILEOPSTRUCT));
22. Fileop.fflags = fof_noconfirmation| fof_noconfirmmkdir| fof_noerrorui| fof_filesonly| Fof_nocopysecurityattribs;
24. Fileop.hnamemappings = NULL;
26. Fileop.hwnd = NULL;
28. Fileop.lpszprogresstitle = NULL;
30. Fileop.pfrom = newpathfrm;
32. Fileop.pto = Lpsztopath;
34. Fileop.wfunc = fo_copy;
36. return return SHFileOperation (&FILEOP);
38. }

Code compare Russell. Time to complete replication: 57,923 milliseconds.

Scenario 2: Calling Api:copyfile

[CPP]View PlainCopy

1. BOOL Cutility::copyfolder (lpctstr lpszfrompath,lpctstr lpsztopath)
2. {
3. return CopyFile (Lpszfrompath, Lpsztopath, TRUE);
4. }

Code is short and concise. Replication time: 700 milliseconds.

Scenario 3: Call the cmd command.

[CPP]View PlainCopy

1. BOOL Cutility::copyfolder (lpctstr lpszfrompath,lpctstr lpsztopath)
2. {
3. TCHAR tbuff[255];
4. Char buff[255];
5. _stprintf (Tbuff, _t ("copy/y%s%s"), Lpszfrompath, Lpsztopath);
6. Tchar2char (Tbuff, buff, 255);
7. System (buff);
8. return TRUE;
9. }

Ran to 5 minutes after the direct card to die. There is no result, possibly a problem with parameter passing.

http://blog.csdn.net/lsldd/article/details/8191338

The choice of copying files in a Windows program