Merge branch 'fixread'
This commit is contained in:
Mark McGranaghan
commit
e39e5b3889
@ -40,7 +40,7 @@ func main() {
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b1 := make([]byte, 5)
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n1, err := f.Read(b1)
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check(err)
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fmt.Printf("%d bytes: %s\n", n1, string(b1))
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fmt.Printf("%d bytes: %s\n", n1, string(b1[:n1]))
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// You can also `Seek` to a known location in the file
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// and `Read` from there.
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@ -49,7 +49,8 @@ func main() {
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b2 := make([]byte, 2)
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n2, err := f.Read(b2)
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check(err)
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fmt.Printf("%d bytes @ %d: %s\n", n2, o2, string(b2))
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fmt.Printf("%d bytes @ %d: ", n2, o2)
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fmt.Printf("%v\n", string(b2[:n2]))
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// The `io` package provides some functions that may
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// be helpful for file reading. For example, reads
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@ -80,5 +81,4 @@ func main() {
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// be scheduled immediately after `Open`ing with
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// `defer`).
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f.Close()
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}
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@ -1,2 +1,2 @@
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2aa7a2e248065cebfa6f8eece3234b5ffa710273
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GQgp-I3dLb2
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463a6f2999a023887af6b23c8f79f24978eb8115
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cocJ6kBH_iZ
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@ -1,6 +1,6 @@
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$ echo "hello" > /tmp/dat
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$ echo "go" >> /tmp/dat
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$ go run reading-files.go
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$ go run reading-files.go
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hello
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go
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5 bytes: hello
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@ -29,7 +29,7 @@ reading files.</p>
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</td>
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<td class="code leading">
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<a href="http://play.golang.org/p/GQgp-I3dLb2"><img title="Run code" class="run" src="data:image/png;base64,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" /></a>
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<a href="http://play.golang.org/p/cocJ6kBH_iZ"><img title="Run code" class="run" src="data:image/png;base64,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" /></a>
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<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
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</pre></div>
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@ -128,7 +128,7 @@ actually were read.</p>
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<div class="highlight"><pre> <span class="nx">b1</span> <span class="o">:=</span> <span class="nb">make</span><span class="p">([]</span><span class="kt">byte</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span>
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<span class="nx">n1</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">f</span><span class="p">.</span><span class="nx">Read</span><span class="p">(</span><span class="nx">b1</span><span class="p">)</span>
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<span class="nx">check</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%d bytes: %s\n"</span><span class="p">,</span> <span class="nx">n1</span><span class="p">,</span> <span class="nb">string</span><span class="p">(</span><span class="nx">b1</span><span class="p">))</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%d bytes: %s\n"</span><span class="p">,</span> <span class="nx">n1</span><span class="p">,</span> <span class="nb">string</span><span class="p">(</span><span class="nx">b1</span><span class="p">[:</span><span class="nx">n1</span><span class="p">]))</span>
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</pre></div>
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</td>
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@ -147,7 +147,8 @@ and <code>Read</code> from there.</p>
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<span class="nx">b2</span> <span class="o">:=</span> <span class="nb">make</span><span class="p">([]</span><span class="kt">byte</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
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<span class="nx">n2</span><span class="p">,</span> <span class="nx">err</span> <span class="o">:=</span> <span class="nx">f</span><span class="p">.</span><span class="nx">Read</span><span class="p">(</span><span class="nx">b2</span><span class="p">)</span>
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<span class="nx">check</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%d bytes @ %d: %s\n"</span><span class="p">,</span> <span class="nx">n2</span><span class="p">,</span> <span class="nx">o2</span><span class="p">,</span> <span class="nb">string</span><span class="p">(</span><span class="nx">b2</span><span class="p">))</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%d bytes @ %d: "</span><span class="p">,</span> <span class="nx">n2</span><span class="p">,</span> <span class="nx">o2</span><span class="p">)</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">"%v\n"</span><span class="p">,</span> <span class="nb">string</span><span class="p">(</span><span class="nx">b2</span><span class="p">[:</span><span class="nx">n2</span><span class="p">]))</span>
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</pre></div>
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</td>
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@ -214,22 +215,11 @@ reading methods it provides.</p>
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be scheduled immediately after <code>Open</code>ing with
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<code>defer</code>).</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">f</span><span class="p">.</span><span class="nx">Close</span><span class="p">()</span>
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</pre></div>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code">
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<div class="highlight"><pre><span class="p">}</span>
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<div class="highlight"><pre> <span class="nx">f</span><span class="p">.</span><span class="nx">Close</span><span class="p">()</span>
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<span class="p">}</span>
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</pre></div>
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</td>
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@ -247,7 +237,7 @@ be scheduled immediately after <code>Open</code>ing with
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<div class="highlight"><pre><span class="gp">$</span> <span class="nb">echo</span> <span class="s2">"hello"</span> > /tmp/dat
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<span class="gp">$</span> <span class="nb">echo</span> <span class="s2">"go"</span> >> /tmp/dat
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<span class="gp">$</span> go run reading-files.go
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<span class="gp">$</span> go run reading-files.go
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<span class="go">hello</span>
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<span class="go">go</span>
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<span class="go">5 bytes: hello</span>
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