readHeader
Read file header
Description
Examples
Read Header Data
Read the header data from a binary file using the readHeader
function.
Write a header, followed by the data to a binary file named myfile.dat
. The header is a 1-by-4 matrix of double precision values, followed by a 5-by-1 vector of single-precision values. The data is a sequence of 1000 double-precision values.
fid = fopen('myfile.dat','w'); fwrite(fid,[1 2 3 4],'double'); fwrite(fid,single((1:5).'),'single'); fwrite(fid,(1:1000).','double'); fclose(fid);
Read the header using a dsp.BinaryFileReader
object. Specify the expected header structure. This structure specifies only the format of the expected binary file header and does not contain the exact values.
reader = dsp.BinaryFileReader('myfile.dat'); s = struct('A',zeros(1,4),'B',ones(5,1,'single')); reader.HeaderStructure = s;
Read the header using the readHeader
function.
H = readHeader(reader);
fprintf('H.A: ')
H.A:
fprintf('%d ',H.A);
1 2 3 4
fprintf('\nH.A datatype: %s\n',class(H.A))
H.A datatype: double
fprintf('H.B: ')
H.B:
fprintf('%d ',H.B);
1 2 3 4 5
fprintf('\nH.B datatype: %s\n',class(H.B))
H.B datatype: single
Input Arguments
reader
— Binary file reader
dsp.BinaryFileReader
System object™
dsp.BinaryFileReader
System object™Binary file reader object, specified as a dsp.BinaryFileReader
System object.
Output Arguments
header
— Header structure
structure
Header structure of the binary file, returned as a structure. Each field of the
structure is a real matrix of a built-in type. For example, if you specify the
HeaderStructure
property of the
dsp.BinaryFileReader
object to
struct('field1',1:10,'field2',single(1))
, the object writes a
header formed by 10 double-precision values, (1:10), followed by one single precision
value, single(1). If you do not specify a header, the object returns an empty structure,
struct([])
.
Data Types: struct
Version History
Introduced in R2016b
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