blitz-research
77 lines
2.3 KiB
HTML
77 lines
2.3 KiB
HTML
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<title>Blitz3D Docs</title>
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<link rel=stylesheet href=../css/commands.css type=text/css>
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</head>
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<body>
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<h1>ReadFloat (filehandle/stream)</h1>
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<h1>Parameters</h1>
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<table>
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filehandle/stream = a valid variable set with the OpenFile, ReadFile command, or OpenTCPStream (v1.52+) The value returned is a floating point number.
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<h1>Description</h1>
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Once you've opened a disk file (or stream) for reading, use this command to read a single floating point number from the file. Note, each value written uses 4 bytes of space. Reading beyond the end of file does not result in an error, but each value read will be zero.
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<br />
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<br />
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Streams can only be used in Blitz Basic v1.52 or greater.
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</td>
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</tr>
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</table>
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<h1><a href=../2d_examples/ReadFloat.bb>Example</a></h1>
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<table>
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; Reading and writing a file using ReadFloat and WriteFloat functions
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<br />
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<br />
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; Initialise some variables for the example
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Num1# = 10.5 ; store 10.5
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Num2# = 365.25 ; store 365.25
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Num3# = 32767.123 ; 32767.123 is the largest positive Short Integer Value in BlitzBasic )
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Num4# = -32768.123 ; -32768.123 the largest negative Short Integer Value in BlitzBasic )
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<br />
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<br />
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; Open a file to write to
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<br />
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fileout = WriteFile("mydata.dat")
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; Write the information to the file
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WriteFloat( fileout, Num1 )
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WriteFloat( fileout, Num2 )
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WriteFloat( fileout, Num3 )
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WriteFloat( fileout, Num4 )
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; Close the file
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CloseFile( fileout )
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; Open the file to Read
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filein = ReadFile("mydata.dat")
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Read1# = ReadFloat( filein )
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Read2# = ReadFloat( filein )
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Read3# = ReadFloat( filein )
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Read4# = ReadFloat( filein )
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; Close the file once reading is finished
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CloseFile( filein )
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Print "Floating Point Data Read From File - mydata.dat "
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Print Read1
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Print Read2
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Print Read3
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Print Read4
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<br />
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<br />
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WaitKey()
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<br />
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</td>
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</tr>
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</table>
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<br>
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<a target=_top href=../index.htm>Index</a><br>
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<br>
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Click <a href=http://www.blitzbasic.co.nz/b3ddocs/command.php?name=ReadFloat&ref=comments target=_blank>here</a> to view the latest version of this page online</body>
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</html>
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