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246 lines
9.9 KiB
246 lines
9.9 KiB
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<title>BLASTER - Winsock IrDA Sample Application</title>
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</head>
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<body lang=EN-US style='tab-interval:.5in'>
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<div class=Section1>
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<h2><span style='font-family:Verdana'>BLASTER – Winsock IrDA Sample Application<o:p></o:p></span></h2>
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<h3><span style='font-family:Verdana'>SUMMARY<o:p></o:p></span></h3>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Blaster is a simple
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application that illustrates Windows NT 5.0’s support of the IrDA protocol.
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IrDA provides reliable point to point connectivity between 2 computers equipped
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with infrared transceivers. Blaster uses the WinSock API with the IrDA address
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family to setup a single connection and "blast" random data to a peer
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machine that is also running blaster.<o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Blaster can be used
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during the development of Winsock application or OEM IrDA NDIS drivers to get
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an initial impression of performance.<o:p></o:p></span></p>
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<h3><span style='font-family:Verdana'>BUILDING THE SAMPLE<o:p></o:p></span></h3>
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<p><span style='font-size:10.0pt;font-family:Verdana'>To build BLASTER.EXE,
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select either the checked or free DDK environment, change to the directory
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BLASTER and type BUILD.<o:p></o:p></span></p>
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<p><b style='mso-bidi-font-weight:normal'><span style='font-size:13.5pt;
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font-family:Verdana'>RUNNING THE SAMPLE<o:p></o:p></span></b></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Copy BLASTER.EXE the test
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machine and run it.<o:p></o:p></span></p>
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<h3><span style='font-family:Verdana'>RESOURCES<o:p></o:p></span></h3>
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<p><span style='font-size:10.0pt;font-family:Verdana'>IrDA Winsock applications
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are discussed in greater detail in the .DOC files included in the IrDA section
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of the DDK samples. <o:p></o:p></span></p>
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<h3><span style='font-family:Verdana'>CODE TOUR<o:p></o:p></span></h3>
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<h4><span style='font-family:Verdana'>File Manifest<o:p></o:p></span></h4>
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<pre><u>Files<span style='mso-spacerun:yes'> </span>Description<o:p></o:p></u></pre><pre>BLASTER.HTM<span style='mso-spacerun:yes'> </span>The documentation for this sample (this file).</pre><pre><span
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class=GramE><span style='font-family:Courier'>SOURCES<span style='mso-spacerun:yes'> </span>The generic file for building the code sample.</span></span><span
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style='font-family:Courier'><o:p></o:p></span></pre><pre><span class=GramE><span
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style='font-family:Courier'>BLASTER.C<span style='mso-spacerun:yes'> </span>The Source for blaster.</span></span><span
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style='font-family:Courier'><o:p></o:p></span></pre><pre><span
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style='font-family:Courier'>BLASTER.RC<span style='mso-spacerun:yes'> </span>The <span
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class=GramE>resource file</span> for blaster.<o:p></o:p></span></pre><pre><span
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class=GramE><span style='font-family:Courier'>MAKEFILE<span style='mso-spacerun:yes'> </span>The standard DDK <span
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class=SpellE>makefile</span>.</span></span><span style='font-family:Courier'><o:p></o:p></span></pre><pre><span
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style='font-family:Courier'>RESOURCE.H<span style='mso-spacerun:yes'> </span>C Defines for blaster.<o:p></o:p></span></pre><pre><span
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style='font-family:Courier'>RESRC1.H<span style='mso-spacerun:yes'> </span>More C Defines.<o:p></o:p></span></pre>
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<h4><span style='font-family:Verdana'>Programming Tour<o:p></o:p></span></h4>
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<p><span style='font-size:10.0pt;font-family:Verdana'>The major topics covered
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in this tour are: <o:p></o:p></span></p>
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<ul type=disc>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo1;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Enumerating Visible Devices <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo1;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Bind()<o:p></o:p></span></li>
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</ul>
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<p><span style='font-size:10.0pt;font-family:Verdana'>The majority of code in
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this sample is actually devoted to window setup. The heart of the application
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and the source of most interest to the reader are the functions <span
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class=SpellE><span class=GramE><b>SendThread</b></span></span><span
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class=GramE><b>(</b></span><b>)</b> and <span class=SpellE><b>RecvThread</b></span><b>()</b>.
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All of the functionality required for IrDA connections are encapsulated there.
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The application itself is very simple. On startup, <span class=SpellE><span
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class=GramE><b>RecvThread</b></span></span><span class=GramE><b>(</b></span><b>)</b>
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creates a socket to listen for incoming IrDA connections. When the user clicks
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the only button in the interface, <span class=SpellE><span class=GramE><b>SendThread</b></span></span><span
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class=GramE><b>(</b></span><b>)</b> is invoked to enumerate available devices
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and establish a connection with the first visible device. It will proceed to ‘blast’
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data through this connection, and then close it.<o:p></o:p></span></p>
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<h4><span style='font-family:Verdana'>Enumerating Visible Devices<o:p></o:p></span></h4>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Infrared Devices which
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are in range will be enumerated when the user calls <span class=SpellE><span
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class=GramE><b>getsockopt</b></span></span><span class=GramE><b>(</b></span><b>)</b>
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with the parameters of <b>SOL_IRLMP</b> and <b>IRLMP_ENUMDEVICES</b>. Note that
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no special coding is required if the computer has more than one IrDA adapter.
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The protocol will automatically query for all visible devices on all IrDA
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adapters present, and return them in a single call. Note that if a device is
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visible to more than one adapter, it may be presented twice in the list.<o:p></o:p></span></p>
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<h4><span class=GramE><span style='font-family:Verdana'>Bind()</span></span><span
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style='font-family:Verdana'><o:p></o:p></span></h4>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Special notice is made
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here that, unlike other Winsock protocol families, no call to <span
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class=GramE><b>bind(</b></span><b>)</b> is required before calling <b>connect()</b>.
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<span class=GramE><b>Bind(</b></span><b>)</b> is normally used to insure the
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socket is correctly bound to a local address, generally for cases of multiple
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local adapters. The IrDA protocol abstracts multiple adapters so that this is
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not necessary. All context information needed to force the connection through
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the correct adapter is contained in the <b>SOCKADDR_IRDA</b> structure provided
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to <span class=GramE><b>connect(</b></span><b>)</b>, in these fields: <span
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class=SpellE><b>irdaDeviceID</b></span> and <span class=SpellE><b>irdaDeviceName</b></span>.
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If you do attempt to <span class=GramE><b>bind(</b></span><b>)</b> on an
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outbound connection, the <b>connect() </b>will return an error.<o:p></o:p></span></p>
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</div>
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