A C++ Wrapper and Extension of Windows FileSystemObject Objects

Introduction

Windows comes with a FileSystemObject system. It provides easy-to-use folder/file manipulation interfaces. Unfortunately, only scripting language-based developers can take advantage of it. CFileSystemObject is a C++ implementation of Windows FileSystemObject. It wraps standard interfaces (method/properties) in C++ classes. C++ developers easily can use it to interact with Windows folders and files without dealing with Win32 APIs (and their complicated parameters). In addition, I extend the final C++ class further to support binary file operations. With this, most developers are able to finish 90% of their folder/file-related coding work by using these C++ classes.

FileSystemObject Classes at a Glance

Class Name Wrapper to Interface Description
CFsoFileSystemObject FileSystemObject Gets other object interface
CFsoDrive Drive Manipulates drives (for example, c:\)
CFsoFolder Folder Manipulates folders (for example, c:\windows)
CFsoFile File Manipulates files (for example, c:\windows\xxx.dll)
CFsoTextStream TextStream Reads/Writes/Appends text files (supports both ASCII and Unicode)
CFsoBinaryStream   Interface extension to support binary file operation; reads/writes/appends binary files

How to Use Them

You need to get an instance of FileSystemObject:

CFileSystemObject * fso = new CFileSystemObject();

Once you get the instance, you can use it to access other interfaces and play with methods/properties that are exposed.

  1. Drive
  2. CFsoDrive * driveC = fso->GetDrive(L"c:\\");
  3. Folder
  4. CFsoFolder * folderWinRoot = fso->GetFolder(L"c:\\windows");
    
  5. File
  6. CFsoFile * fileText = fso->GetFile(L"c:\\windows\\abc.txt");
    CFsoFile * fileBinary = fso->GetFile(L"c:\\windows\\abc.bin");
    
  7. Open a text stream (using the text file object gotten at Step 3)
  8. CFsoTextStream * textStream =
       fileText->OpenAsTextStream(1/*IO Mode*/,
                                  0/*Text Format*/);
    
  9. Open a binary stream (using the binary file object gotten at Step 3)
  10. CFsoBinaryStream * binaryStream =
       fileBinary->OpenAsBinaryStream(1/*IO Mode*/);
    
  11. Enumerate all sub-folders under a specified folder (using the folder object gotten at Step 2)
  12. CFsoList<CFsoFolder> * subFolders = folderWinRoot->GetSubFolders();
    for (int i = 0; i < subFolders->GetCount(); i++)
    {
       CFsoFolder * folder = subFolders->Get(i);
       ...
       ...
       ...
    }
    // Clear all folder objects in the list and release memory
    // occupied
    subFolders->Clear(true);
    
  13. Enumerate all files under a specified folder (using the folder object gotten at Step 2)
  14. CFsoList<CFsoFile> * files =
       folderWinRoot->GetFiles();
    for (int i = 0; i < files->GetCount(); i++)
    {
       CFsoFile * file = files->Get(i);
       ...
       ...
       ...
    }
    // Clear all file objects in the list and release memory
    // occupied
    files->Clear(true);
    

Conclusion

To help you understand those classes, methods, enums and typedefs, I write concrete comments in the source code and generate HTML documentation by using Doxygen. You can easily find out the information you need to play with these classes. When you unzip the source code file, you can find one .CPP, one .H ,plus one folder named HTML. Please enter the HTML folder and double-click indext.html to open the source code documentation. Enjoy!

Please make sure the file path of scrrun.dll is correct according to your Windows system settings. On my PC, the default Windows root path is C:\Winnt. It may not be the same for your system. If your system root path is C:\Windows, please change line #25 in CFileSystemObject.h accordingly. Otherwise, a compiler error will occur.



About the Author

Skeeter Xu

Software Architect from Intel R&D Center, Shanghai China. Before that, I was working in Singapore for 8 years focusing on all kinds of Windows platform development - from firmware, device drive to application level.

Downloads

Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • The exponential growth of data, along with virtualization, is bringing a disruptive level of complexity to your IT infrastructure. Having multiple point solutions for data protection is not the answer, as it adds to the chaos and impedes on your ability to deliver consistent SLAs. Read this white paper to learn how a more holistic view of the infrastructure can help you to unify the data protection schemas by properly evaluating your business needs in order to gain a thorough understanding of the applications …

  • With JRebel, developers get to see their code changes immediately, fine-tune their code with incremental changes, debug, explore and deploy their code with ease (both locally and remotely), and ultimately spend more time coding instead of waiting for the dreaded application redeploy to finish. Every time a developer tests a code change it takes minutes to build and deploy the application. JRebel keeps the app server running at all times, so testing is instantaneous and interactive.

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds