I want to know REDIS how to write binary data.
It open a file not in "b" mode.
fp = fopen(tmpfile,"w")
Any help in this regard.
In liunx, fopen has no b mode, see fopen man doc:
r Open text file for reading. The stream is positioned at the beginning of the file.
r+ Open for reading and writing. The stream is positioned at the beginning of the file.
w Truncate file to zero length or create text file for writing. The stream is positioned at the beginning of the file.
w+ Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file.
a Open for appending (writing at end of file). The file is created if it does not exist. The stream is positioned at the end of the file.
a+ Open for reading and appending (writing at end of file). The file is created if it does not exist. The initial file position for reading is at the beginning of the file,
but output is always appended to the end of the file.
Related
I saved the data in txt file. Everything is ok. Now, I want to show the data on the chart then that data send by email.
First, I select the txt file from the dialog and then show it on the chart or graph which is ok till here. Then, I want to attach that file automatically and after 5 sec sends it to a specific email. my problem is that I don't want to create a control for attach to choose the txt file, I want to select once the file , then read, then that file email.
Normally, I must select once to read and another time again to select that file (2 times) but I want to select one time the txt file then read and after 5 sec that file attaches and email. I cannot connect attach file wire (RED Wire) to the file dialog because the type of attach is 1D array file path and the type of file dialog is path, I don't know what should I do.
Thanks for helping me.
Use Build Array function to convert your single path (which goes from path select dialog) to 1D array of paths.
I need to append 1 text file to another text file.
I've done several keyword searches, and keep coming up with instructions on adding text to an existing file ... which is not the same as appending one text file to another text file.
In a well-designed language, it might look something like the line below, with the contents of source2 added to source1.
Append(path/source1, path/source2, ResultCode)
say we have an external program, that writes a text file during a long calculation.
Now, I need to read that file in order to check the status of calculation (residuals values, stop on error etc).
The file has size of up to 1Mb. Since the program only adds new information to the end of the file, I dont want to reopen it and reread from the very beginning each time.
Is there a way to start reading the file from a specific line number (where I stopped last time)?
What happens to the file when it is opened in Excel for reading, and after that it is changed by the external program? EoF position shifts forward?
You can use the statement Seek [#]filenumber, position to move to a specific byte in a opened file. Just save the position in the file where you stopped with the function Seek( filenumber ) or with LOF( filennumber ) if you reached the EOF( filenumber ).
I'm trying to print the number of rows in my file training.txt but found out that my code does not read the whole file. Code goes like this:
row = 1
for line in io.lines 'training.txt' do
row = row + 1
end
print(row)
I tried changing the file with test.txt that has the same format with training.txt and file reading worked fine, reads until the end of file. So maybe the problem is with my text file? But how? It has the same format.
Text files are uploaded here for testing.
The file you uploaded training.txt is not the same format as test.txt, it does not have newline characters that indicate the EOL (End of Line). Try opening it in notepad to see the difference.
I have a large file which i am writing to a smaller file in VB, i just dont know how to select lines from an input file that i opened.
I would like to keep the first 12 lines of the large file and them copy every 3rd line into the new output.
Any help?!
You can do this with a StreamReader - just open one on the file, then you can call ReadLine() on it as many times as you need.
Easiest implementation would probably be a 0-to-11 (or 1-to-12) For loop, then a While where you read 2 and ignore them, then read the 3rd and write it.
Writing the new file can be done with StreamWriter, which just has a WriteLine() method to write the text.
The StreamReader and StreamWriter are generally the easiest ways to read and write text files.