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how can i resolve this issue of fread command

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tauqeer
tauqeer 2013-5-9
plz help me out i m recieving this error, dont know what it means and how to resolve it, have tried different versions of matlab and recieved same error this code executed successfully just once now this error is visible
"name=uigetfile('*.*');
file_open=fopen(name,'r');
file_read=fread(file_open,'uint8');
fclose(file_open);
a=file_read;"
*_Error using fread Invalid file identifier. Use fopen to generate a valid file identifier.
Error in bwtenc (line 4) file_read=fread(file_open,'uint8');_*

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回答（2 个）

michael scheinfeild
编辑：Walter Roberson 2013-5-9
openonly one file at time , see if the file name is correct
fid = fopen("fname.txt","rt")
data=fread(fid,inf);% of data= fscanf
fclose(fid)
if it is binary open by fid=fopen("fname.bin","rb")
  2 个评论
tauqeer
tauqeer 2013-5-9
brother i m opening only one file + file name is also correct have executed this code it had just worked once now i m recieving error.
Walter Roberson
Walter Roberson 2013-5-9
MATLAB opens in binary unless you use the 't' flag. This is opposite of C's convention.

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Walter Roberson
Walter Roberson 2013-5-9
[filename, filepath] = uigetfile('*.*');
name = fullfile(filepath, filename);
file_open = fopen(name, 'r');
file_read = fread(file_open,'uint8');
fclose(file_open);
a = file_read;
My guess is that one of the times you were already in the correct directory and the other times you were in a different directory than where your files were located.

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