How to overwrite only part of a file in c++

Use std::fstream. The simpler std::ofstream would not work. It would truncate your file (unless you use option std::ios_base::app, which is not what you want anyway). std::fstream s(my_file_path); // use option std::ios_base::binary if necessary s.seekp(position_of_data_to_overwrite, std::ios_base::beg); s.write(my_data, size_of_data_to_overwrite);

How do you extract email addresses from the ‘To’ field in outlook?

Check out the Recipients collection object for your mail item, which should allow you to get the address: http://msdn.microsoft.com/en-us/library/office/ff868695.aspx Update 8/10/2017 Looking back on this answer, I realized I did a bad thing by only linking somewhere and not providing a bit more info. Here’s a code snippet from that MSDN link above, showing how … Read more

Historical reason behind different line ending at different platforms

DOS inherited CR-LF line endings (what you’re calling \r\n, just making the ascii characters explicit) from CP/M. CP/M inherited it from the various DEC operating systems which influenced CP/M designer Gary Kildall. CR-LF was used so that the teletype machines would return the print head to the left margin (CR = carriage return), and then … Read more

How do I concatenate two text files in PowerShell?

Simply use the Get-Content and Set-Content cmdlets: Get-Content inputFile1.txt, inputFile2.txt | Set-Content joinedFile.txt You can concatenate more than two files with this style, too. If the source files are named similarly, you can use wildcards: Get-Content inputFile*.txt | Set-Content joinedFile.txt Note 1: PowerShell 5 and older versions allowed this to be done more concisely using … Read more

Text file in VBA: Open/Find Replace/SaveAs/Close File

Guess I’m too late… Came across the same problem today; here is my solution using FileSystemObject: Dim objFSO Const ForReading = 1 Const ForWriting = 2 Dim objTS ‘define a TextStream object Dim strContents As String Dim fileSpec As String fileSpec = “C:\Temp\test.txt” Set objFSO = CreateObject(“Scripting.FileSystemObject”) Set objTS = objFSO.OpenTextFile(fileSpec, ForReading) strContents = objTS.ReadAll … Read more

Batch / Find And Edit Lines in TXT file

On a native Windows install, you can either use batch(cmd.exe) or vbscript without the need to get external tools. Here’s an example in vbscript: Set objFS = CreateObject(“Scripting.FileSystemObject”) strFile = “c:\test\file.txt” Set objFile = objFS.OpenTextFile(strFile) Do Until objFile.AtEndOfStream strLine = objFile.ReadLine If InStr(strLine,”ex3″)> 0 Then strLine = Replace(strLine,”ex3″,”ex5″) End If WScript.Echo strLine Loop Save as … Read more