C FILE PEEK HOW TO
C FILE PEEK CODE

Consider these possibilities when you write code to handle the exceptions that may be generated. The files may not exist, the files may be in use, or users may not have rights on the files of folders that they're trying to access. Many things can go wrong when a user gains access to files. String* files= Directory::GetFiles(this->windir) This sample code uses the GetFiles method of the Directory class to obtain a listing of files. String* dirs = Directory::GetDirectories(windir) This sample code uses the GetDirectories method of the Directory class to obtain a list of folders. String* drives = Directory::GetLogicalDrives() For this sample, the results appear in a ListBox control. This sample code uses the Directory and Drive classes to list the logical drives on a system. ListBox1->Items->Add(String::Concat(S'Size = ', (pFileProps->get_Length()).ToString())) ListBox1->Items->Add(String::Concat(S'Last Write Time = ', (pFileProps->get_LastWriteTime()).ToString())) ListBox1->Items->Add(String::Concat(S'Last Access Time = ' ,(pFileProps->get_LastAccessTime()).ToString())) ListBox1->Items->Add(String::Concat(S'Creation Time = ', (pFileProps->get_CreationTime()).ToString())) ListBox1->Items->Add(String::Concat(S'File Name = ', (pFileProps->get_FullName()))) String* testfile = String::Concat(windir, (S'įileInfo *pFileProps =new FileInfo(testfile) The properties appear in a ListBox control. This sample code uses a FileInfo class to access a file's properties. String *filew = new String(S'File Written to C:\KBTest.txt') Pwriter->WriteLine(S'File created using StreamWriter class.') StreamWriter* pwriter = new StreamWriter(S'c:\KBTest.txt') If you have an existing file, you can open it in the same way. This sample code uses a StreamWriter class to create and write to a file. In the right pane, click to select Common Language Runtime Support, Old Syntax (/clr:oldSyntax) in the Common Language Runtime support project settings. is a placeholder for the name of the project.Įxpand Configuration Properties, and then click General. To add the common language runtime support compiler option, follow these steps:Ĭlick Project, and then click Properties. In Visual C++, you must add the common language runtime support compiler option ( /clr:oldSyntax) to successfully compile the previous code sample as managed C++. ListBox1->Items->Add(reader->ReadLine()) StreamReader *reader=new StreamReader(textFile) String* textFile = String::Concat(windir, (S'\mytest.txt')) There are many ways to determine when the end of the file is reached this sample uses the Peek method to examine the next line before reading it. The try.catch block is used to alert the program if the file is empty. The contents of the file are added to a ListBox control. The following sample code uses a StreamReader class to read a text file.

C FILE PEEK HOW TO

The Step-by-step example section describes how to create a sample program that demonstrates the following six file I/O operations: The examples in this article describe basic file I/O operations. NET Framework, offer functionality that isn't available with the FileSystemObject, without the overhead of the Interop layer.

However, the File class, the FileInfo class, the Directory, DirectoryInfo classes, and other related classes in the. NET Framework generates a wrapper for the component for you if you want to use it. NET Framework requires that access to the object be through the Interop layer. Because the FileSystemObject is a Component Object Model (COM) component, the. You can still use the FileSystemObject in the. To make the transition easier, see How To Use FileSystemObject with Visual Basic.įor a Visual C#. NET Framework is similar to the FileSystemObject that is popular with many Visual Studio developers. NET Framework, you'll find that the object model for file operations in the. Original product version: Visual C++ Original KB number: 307398 Summary This article describes how to do basic file input/output (I/O) operations in Microsoft Visual C++ or in Visual C++.

C file peek