It will throw a FileNotFoundException if the file doesn’t exist and cannot be created (doc), but it will create it if it can. To be sure you probably should first test that the file exists before you create the FileOutputStream (and create with createNewFile() if it doesn’t):
First, there is no particularly good reason to use fdopen if fopen is an option and open is the other possible choice. You shouldn’t have used open to open the file in the first place if you want a FILE *. So including fdopen in that list is incorrect and confusing because it isn’t very … Read more
In python, the following will let us write to stdout: However, I want to be flexible about which stream we print to. I want to pass the stream as an argument into a function, as you would when calling fprintf in any of C derived languages. In the snippet of source code above, stdout is … Read more
You have to put file extension here
There’s a trick to this. You need to duplicate the open file descriptor to file descriptor 1, i.e. stdout. Then you can use printf:
xcopy.exe is definitely your friend here. It’s built into Windows, so its cost is nothing. Just xcopy /s c:\source d:\target You’d probably want to tweak a few things; some of the options we also add include these: /s/e – recursive copy, including copying empty directories. /v – add this to verify the copy against the original. slower, but for … Read more
Stored as strings: For floats:
Does anyone have an example of code that can write to a binary file. And also code that can read a binary file and output to screen. Looking at examples I can write to a file ok But when I try to read from a file it is not outputting correctly.
You are trying to read each line twice. Change it to: EDIT: To answer your questions: How does getline() work?Reads the entire line up to ‘\n’ character or the delimiting character specified. http://www.cplusplus.com/reference/string/string/getline/?kw=getline After reading the line, the control goes to the next line in the file.Also, it returns a boolean value of true if … Read more
Well, you’re trying to open the file file_no.txt for reading and for writing using separate streams. This may not work as the file will be locked by the reading stream, so the writing stream can’t be created and you get the exception. One solution would be to read the file first, close the stream and … Read more