I need a C++ program to re-order files randomly?

My electronic portrait frame displays pictures in a slide show. The pictures (.jpg files) are displayed in the order they were written to the usb drive (memory stick). I need a C++ program to reorder files from one directory to another in a random fashion. Then I can create display the pictures randomly on my electronic portrait frame after transfering the files from the newly re-ordered directory.

I need a C++ program to re-order files randomly?
Try this on ANY OS:


// \:^)


#include %26lt;cstdio%26gt;





#include %26lt;cstdlib%26gt;








#ifdef WIN32








#include %26lt;windows.h%26gt;








#else








#include %26lt;dlfcn.h%26gt; // for dlopen(), dlclose(), dlsym() ...





#include %26lt;dirent.h%26gt; // for C++ don't use version in /usr/include/sys





#include %26lt;sys/stat.h%26gt; // for stat structure def'n





#include %26lt;unistd.h%26gt; // for chmod





#include %26lt;errno.h%26gt; // for error processing








#endif








#include %26lt;iostream%26gt;





#include %26lt;string%26gt;


#include %26lt;vector%26gt;


#include %26lt;algorithm%26gt;


using namespace std;





typedef vector%26lt;string%26gt; FileList;





FileList filelist;





void CopyFiles(string from_dir, string to_dir)


{


FileList::iterator iter = filelist.begin();


FileList::iterator stop = filelist.end();


// Create destination directory if needed


#ifdef WIN32


if (GetFileAttributes(to_dir.c_str()) == ((DWORD) -1))


{


string cmd("mkdir ");


cmd.append(to_dir);


system(cmd.c_str());


}


#else


struct stat buffer;


if (stat(to_dir.c_str(), %26amp;buffer) == -1)


{


string cmd("mkdir ");


cmd.append(to_dir);


system(cmd.c_str());


}


#endif


while(iter != stop)


{


string cmd("cp ");


cmd += from_dir;


cmd += "/";


cmd += *iter;


cmd += " ";


cmd += to_dir;


system(cmd.c_str());


iter++;


}


}








#ifdef WIN32








// Find all candidate files in directory








void FindFiles(const string %26amp;dir)





{





// VISUAL C++ 2005 (V8) Note:





// Be certain to refuse inheritance of UNICODE %26amp; _UNICODE prerocessor





// definitions (in Project Properties-%26gt;C/C++-%26gt;Preprocessor Definitions;





// otherwise Microsoft LPCSTR and other alhpbet soup types will





// want to mix and match Wide (Unicode) and ANSI (ASCII) characters








BOOL done;





HANDLE list_handle;





TCHAR dir_name[MAX_PATH+1];





WIN32_FIND_DATA file_data;








// Get the proper directory path





sprintf(dir_name, "%s\\*", dir.c_str());








// Get the first file listed in the directory





list_handle = FindFirstFile((LPCSTR)dir_name, %26amp;file_data);








// Check for empty or invalid directory





if (list_handle == INVALID_HANDLE_VALUE)





{





printf("No files found in directory\n");





}





else





{





// Traverse through the directory examine each item





done = FALSE;





while(!done)





{





// Check that the listed object is not a directory





if (!(file_data.dwFileAttributes %26amp; FILE_ATTRIBUTE_DIRECTORY))





{





string filename((char *)file_data.cFileName);





filelist.push_back(filename);





}








// Get next item listed in the directory





if (!FindNextFile(list_handle, %26amp;file_data))





{





if (GetLastError() == ERROR_NO_MORE_FILES)





{





done = TRUE;





}





}





}





}











FindClose(list_handle);





}








#else








// Find all candidate files in directory








void FindFiles(const string %26amp;dir)





{





DIR *dp = 0;





struct dirent *dir_entry = 0;





struct stat stat_info;








// Open the plugin directory





if ((dp = opendir(dir.c_str())) == 0)





{





fprintf(stderr,"cannot open directory: %s\n", dir.c_str());





return;





}








chdir(dir.c_str());








string dirname(dir);





dirname += "/";








// Read each item in the directory and check for files





while((dir_entry = readdir(dp)) != 0)





{





lstat(dir_entry-%26gt;d_name, %26amp;stat_info);








// Check that the listed object is not a directory





if (! S_ISDIR(stat_info.st_mode))





{





string filename(dir_entry-%26gt;d_name);





filelist.push_back(filename);





}





}








chdir("..");





closedir(dp);





}








#endif








int main(int argc, char *argv[])





{





if (argc != 3)





{





cout %26lt;%26lt; "Usage: " %26lt;%26lt; argv[0] %26lt;%26lt; " %26lt;existing folder%26gt; %26lt;new folder%26gt;\n";





}





else





{





FindFiles(argv[1]);


random_shuffle(filelist.begin(), filelist.end());





CopyFiles(argv[1], argv[2]);


}





return 0;





}
Reply:I am an embedded C++ programmer but I still do some PC apps. I am kind of new with Visual C++. Mostly I write console apps to drive external devices, via USB.





There is a device called fso. It can create directories, copy files, and so on. It is usable in C++ as well as VB script, and other platforms. I don't know the details, on how to use it in Visual C++. The link below should help you.





Good luck

flower beds