Reading a .dat file with textread

2012 6 22
1 个回答
回答已采纳
18 次查看（30 天）

0 个投票

How do you read .dat file that contains 5 .jpg images in it using textread?
Also, how do you output the filenames?

请先登录，再回答此问题。

 采纳的回答

Walter Roberson
Walter Roberson 2012-6-22

0 个投票

jpg images are binary images, but textread() is for reading text files.
Does the .dat file perhaps contain the names of the images rather than the images themselves?
There is no standard format for .dat files: it is a suffix used by any program to hold any data. You need to know the internal structure of that particular .dat file in order to work with it. It might be pure text (most .dat files are not).
If you can upload a sample of the file, someone might have a look at it. http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

9 个评论
显示 7更早的评论 隐藏 7更早的评论

Jonathan
Jonathan 2012-6-22
Yes, it is 5 strings of the names of the images. Not the images themselves.
Jonathan
Jonathan 2012-6-22
Would using fscanf be better? I want it to print out the names of the images.
Jonathan
Jonathan 2012-6-22
What about fgets?
Also, I would like to write the "printout" of the names of the images to a .txt file. How do I do that?
Walter Roberson
Walter Roberson 2012-6-22
A lot depends on the file format.
You could probably use fileread(), together with regexp() with the 'split' option.
Jonathan
Jonathan 2012-6-23
Thanks so much for telling me about fileread! It's a life saver. Anyways, I now have my 5 strings stored in a variable called filename. How to a write the contents of filename to a new txt file?
Jonathan
Jonathan 2012-6-23
I mean not write to a txt file, I mean create a new .txt file with filename in it
Jonathan
Jonathan 2012-6-23
Ok, so I figured out how to make a txt file by using fprintf, but it doesn't seperate the strings that are in filename with line breaks. How do I make it do that?
Walter Roberson
Walter Roberson 2012-6-23
I'm not sure what you mean, but anyhow...
fid = fopen('TheFileName.txt','wt');
fprintf(fid, '%s\n', filename{:});
fclose(fid)
I am assuming here that filename is a cell array of strings. If it is a plain string then you may have to break it apart if you want one filename per line. Or perhaps just
fid = fopen('TheFileName.txt','wt');
fprintf(fid, '%s\n', filename);
fclose(fid)
Jonathan
Jonathan 2012-7-5
Thanks a lot! I just needed to add the t next to the w in 'wt' in fid = fopen('TheFileName.txt','wt');. It works perfectly now.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Convert Image Type 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by