Solved

Determine FileSize and Date with Visual C++

Posted on 2000-04-23
4
1,076 Views
Last Modified: 2013-12-14
I have the following source code.  When ran it returns (NULL) for nFileSizeHigh, and it gives a GPF error with nFileSizeLow.  How do I make it work so that it shows the size of the file?  Also, How do I show the date for the file?  I know this should be easy, but I am stumped.

--Code--
#include <stdio.h>
#include <io.h>
#include <time.h>
#include <string.h>
#include <process.h>
#include <windows.h>

FILE *stream;
void use_file(char *p,char *f, char *a, unsigned long s)
{
      fprintf(stream,"%s, %s, %s, %s\n",p,f,a,s);
      printf("%s, %s, %s, %s\n",p,f,a,s);
}
void process_dir(char *DIR)
{
      WIN32_FIND_DATA   wfd;
      char path[255];
      strcpy(path,DIR);
      strcat(path,"*.*");
      HANDLE FF=FindFirstFile(path,&wfd);
      if (FF == INVALID_HANDLE_VALUE) return;
      if (strcmp(wfd.cFileName,".") == 0 || strcmp(wfd.cFileName,"..") == 0 ) FindNextFile(FF,&wfd);
      if (strcmp(wfd.cFileName,".") == 0 || strcmp(wfd.cFileName,"..") == 0 ) FindNextFile(FF,&wfd);
      use_file(DIR,wfd.cFileName,wfd.cAlternateFileName, wfd.nFileSizeHigh);
      while(FindNextFile(FF,&wfd)){
            if (wfd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
                  char newpath[255];
                  strcpy(newpath,DIR);
                  strcat(newpath,wfd.cFileName);      
                  strcat(newpath,"\\");
                  process_dir(newpath); // go into subdirs            
            }
      use_file(DIR,wfd.cFileName,wfd.cAlternateFileName, wfd.nFileSizeHigh);
      }
}

void main()
{
      stream=fopen("c:\\tmp.dat","w");
      fprintf(stream, "DIR, FILENAME, MSDOSNAME, SIZE, TIME\n");
      process_dir("c:\\");
      fclose(stream);
}
0
Comment
Question by:vanberge
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 30

Accepted Solution

by:
SteveGTR earned 50 total points
ID: 2741890
Try this:

void use_file(char* pDir, WIN32_FIND_DATA& wfd)
{
  SYSTEMTIME st;
  char dateStr[11];

  if (!FileTimeToSystemTime(&wfd.ftLastWriteTime, &st))
    strcpy(dateStr, "[unknown]");
  else
    sprintf(dateStr, "%d/%d/%d", st.wMonth, st.wDay, st.wYear);

  fprintf(stream, "%s, %s, %s, %s, ", pDir, wfd.cFileName, wfd.cAlternateFileName,
    dateStr);
  printf("%s, %s, %s, %s, ", pDir, wfd.cFileName,wfd.cAlternateFileName,
    dateStr);
           
#if defined(_X86_) || defined(_ALPHA_)
  __int64 nSize = wfd.nFileSizeLow + (wfd.nFileSizeHigh << 32);

  fprintf(stream, "%I64u\n", nSize);
  printf("%I64u\n", nSize);
#else
  // Ignore high size
  fprintf(stream, "%lu\n", (unsigned long) nFileSizeLow);  
  printf("%lu\n", (unsigned long) nFileSizeLow);  
#endif
}

You were formatting your printf's using a "%s" for the file size. You might just want to ignore the high portion of the file size (MFC does).

Good Luck,
Steve
0
 

Author Comment

by:vanberge
ID: 2742518
SteveGTR thanks for you help.  One question though.  on this segment of code, how does it totaly work.  I sorta follow it, but I think I am missing something.  

#if defined(_X86_) || defined(_ALPHA_)
  __int64 nSize = wfd.nFileSizeLow + (wfd.nFileSizeHigh << 32);

  fprintf(stream, "%I64u\n", nSize);
  printf("%I64u\n", nSize);
#else
  // Ignore high size
  fprintf(stream, "%lu\n", (unsigned long) nFileSizeLow);    
  printf("%lu\n", (unsigned long) nFileSizeLow);    
#endif

Thanks again for your answer.

Eric
0
 
LVL 30

Expert Comment

by:SteveGTR
ID: 2742815
The file size is stored as a 64 bit integer. The low order 32 bits are stored in nFileSizeLow. The high order 32 bits are stored in nFileSizeHigh. The 64 bit unsigned value can be as high as 18,446,744,073,609,551,615. The 32 bit low order has a max of 4,294,967,295. This code will use the high order 32 bits if your machine is capable of handling it (Intel or Alpha). MFC code just ignores the high order bits in the CFile class code (filest.cpp).
0
 

Author Comment

by:vanberge
ID: 2742888
Steve, cool thanks man.
0

Featured Post

[Webinar] Code, Load, and Grow

Managing multiple websites, servers, applications, and security on a daily basis? Join us for a webinar on May 25th to learn how to simplify administration and management of virtual hosts for IT admins, create a secure environment, and deploy code more effectively and frequently.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

  Included as part of the C++ Standard Template Library (STL) is a collection of generic containers. Each of these containers serves a different purpose and has different pros and cons. It is often difficult to decide which container to use and …
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question