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seekstart

seekstart(s)

Seek a stream to its beginning.

Examples

In the Julia programming language, the function seekstart(s) is used to seek a stream s to its beginning.

julia> io = IOBuffer("Hello, world!")
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=13, maxsize=Inf, ptr=1, mark=-1)

julia> seekstart(io)

julia> read(io, String)
"Hello, world!"

Here are some common examples of how to use seekstart():

1. Reset the stream position to the start:

   julia> io = IOBuffer("Julia is awesome!")
   IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=18, maxsize=Inf, ptr=1, mark=-1)
   
   julia> seek(io, 12)  # Move the stream position to 12th character
   12
   
   julia> seekstart(io)  # Reset the stream position to the start
   0
   
   julia> read(io, String)
   "Julia is awesome!"

   This example demonstrates how to reset the stream position to the beginning after seeking to a specific position.

2. Restart reading from the beginning of a file:

   julia> file = open("data.txt", "r")
   IOStream(<file data.txt>)
   
   julia> read(file, String)
   "This is some data."
   
   julia> seekstart(file)
   
   julia> read(file, String)
   "This is some data."

   In this example, the seekstart() function is used to restart reading from the beginning of a file after previously reading some content.

3. Handle multiple seek operations:

   julia> io = IOBuffer("ABCDEFGHIJKLMNOPQRSTUVWXYZ")
   IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=26, maxsize=Inf, ptr=1, mark=-1)
   
   julia> seek(io, 5)  # Move the stream position to 5th character
   5
   
   julia> seekstart(io)  # Reset the stream position to the start
   0
   
   julia> read(io, String)
   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

   This example demonstrates how to handle multiple seek operations by using seekstart() to reset the stream position to the start.

Common mistake example:

julia> io = IOBuffer("Some data")
IOBuffer(data=UInt8[...], readable=true, writable=true, seekable=true, append=false, size=9, maxsize=Inf, ptr=1, mark=-1)

julia> seekstart(io)

In this example, the seekstart() function is used without any subsequent read or seek operations. While it doesn't produce an error, it doesn't have a visible effect either. It's important to understand that seekstart() is used to modify the stream position, and its effect is usually observed when followed by a read or seek operation.

See Also

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