How to open a binary file that returns -1 when using fopen?

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Cristina
Cristina 2017-4-29
评论： Walter Roberson 2017-4-29
I am trying to open a file that someone else recorded. The file is supposedly binary. The extension is meaningless (it refers to the content of the file...). I tried using fopen and the file identifier is -1 (so can't read it in). If I 'manually' open the file it does not show as binary but as many symbols. How can I approach this?
Thank you

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回答（2 个）

Walter Roberson
Walter Roberson 2017-4-29
Use
filename = 'NameOfBinaryFile';
[fid, msg] = fopen(filename, 'r');
if fid < 0
error('Could not open file "%s" because: "%s"', filename, msg);
end
For example it might be in use by another program, or you might not have permission to read it.
  2 个评论
Cristina
Cristina 2017-4-29
I am not trying to make my program available to others. I am trying to analyse the data that is stored in the binary file. The binary data seems to be converted into characters if I open the file with an editor, and the file can't be open at all in MATLAB. I am trying to access the binary data.
Walter Roberson
Walter Roberson 2017-4-29
Currently you do not know why the fopen fails. The above code will tell you why. It has nothing to do with making your program available to others: it has to do with debugging a problem with your program or configuration.

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Image Analyst
Image Analyst 2017-4-29
Check the file attributes. If it's marked at readonly and you're trying to open it for writing, it might return -1. Make sure the readonly checkbox is not checked.

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