How move n-first files to another directory using C++ (VS) - c++

Question

My question crossreferrer with [question]Visual C#: Move multiple files with the same extensions into another directory
but i have yet biggest problem - my directory contain more than 3 million files. C# with .GetFiles() can not solve my problem.
I think, that only with C++ i can do it.
Algorithm
CreateDir "temp"+counterDirs
FindFirst file into source dir
MoveFile into newDir (created on step 1)
increment counterFiles
repeat Steps 2-4 until FindFirst not have error(stop prog) or counterFiles < moveLimit (exmpl 100 000)
increment counterDirs
repeat all from Steps 1-6
target: move all files from src-dir (3 million) into a few target-dirs with 100 000 files.
Please help me with coding - i don't know C++ (VS 2010)
This is my code
`int _tmain(int argc, TCHAR *argv[])
{
WIN32_FIND_DATA ffd;
LARGE_INTEGER filesize;
TCHAR szDir[MAX_PATH];
TCHAR szNewDir[MAX_PATH];
TCHAR szNewDirEx[MAX_PATH];
size_t length_of_arg;
HANDLE hFind = INVALID_HANDLE_VALUE;
DWORD dwError=0;
DWORD dwFiles = 0;
DWORD dwDirs = 0;
// If the directory is not specified as a command-line argument,
// print usage.
if(argc != 2)
{
_tprintf(TEXT("\nUsage: %s <directory name>\n"), argv[0]);
return (-1);
}
// Check that the input path plus 3 is not longer than MAX_PATH.
// Three characters are for the "\*" plus NULL appended below.
StringCchLength(argv[1], MAX_PATH, &length_of_arg);
if (length_of_arg > (MAX_PATH - 3))
{
_tprintf(TEXT("\nDirectory path is too long.\n"));
return (-1);
}
_tprintf(TEXT("\nTarget directory is %s\n\n"), argv[1]);
// Prepare string for use with FindFile functions. First, copy the
// string to a buffer, then append '\*' to the directory name.
StringCchCopy(szDir, MAX_PATH, argv[1]);
StringCchCat(szDir, MAX_PATH, TEXT("\\*"));
StringCchCopy(szNewDir, MAX_PATH, argv[1]);
StringCchCat(szNewDir, MAX_PATH, TEXT("\\dir"));
StringCchCat(szNewDirEx, MAX_PATH, szNewDir);
// Find the first file in the directory.
hFind = FindFirstFile(szDir , &ffd);
if (INVALID_HANDLE_VALUE == hFind)
{
DisplayErrorBox(TEXT("FindFirstFile"));
return dwError;
}
// List all the files in the directory with some info about them.
do
{
if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
_tprintf(TEXT(" %s <DIR>\n"), ffd.cFileName);
}
else
{
if(dwFiles == 0) {
StringCchCat(szNewDirEx, MAX_PATH, TEXT(dwDirs));
CreateDir(szNewDirEx); //dwDirs toString
}
if (!MoveFileEx(__OLDDIR__ + ffd.cFileName, szNewDirEx + ffd.cFileName, MOVEFILE_WRITE_THROUGH))
{
printf ("MoveFileEx failed with error %d\n", GetLastError());
return;
} else {
dwFiles++;
if (dwFiles == 50000) {
dwDirs++;
dwFiles = 0;
}
}
}
}
while (FindFirstFile(hFind, &ffd) != 0);
dwError = GetLastError();
if (dwError != ERROR_NO_MORE_FILES)
{
DisplayErrorBox(TEXT("FindFirstFile"));
}
FindClose(hFind);
return dwError;
}

Answer 1

I found solution my task in How to use DirectoryInfo.GetFiles and have it stop after finding the first match?. I will try run this in my directory and will post result later.
Complete. Code in thread link worked perfect.