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28.2 编组
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C#高级编程（第3版）【全文连载】
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28.2 编组
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165717.htm'>28.1.7 线程</a></div><div style='float:right;width:49%'>·<a href='100165718.htm'>28.1.8 错误处理</a></div><div style='float:left;width:49%'>·<a href='100165719.htm'>28.1.9 事件处理</a></div><div style='float:right;width:49%'>·<a href='100165721.htm'>28.3 在.NET客户程序中使用COM组件</a></div><div style='float:left;width:49%'>·<a href='100165722.htm'>28.3.1 创建COM组件</a></div><div style='float:right;width:49%'>·<a href='100165723.htm'>28.3.2 创建Runtime Callable Wrapper</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:11.4pt;margin-right:0cm;FTEL:11.4pt;margin-left:
0cm'><span lang=EN-US>28.2 </span><span style='font-family:楷体_GB2312'>编组</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>从</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>传送给</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件和其他工具的数据必须转换为相应的表示法，这个机制也称为编组</span><span lang=EN-US>(marshaling)</span><span
style='font-family:宋体'>。具体的转换过程取决于所传递数据的数据类型。这里必须区分</span><span lang=EN-US>blittable</span><span
style='font-family:宋体'>和</span><span lang=EN-US>non-blittable</span><span
style='font-family:宋体'>数据类型。</span></p>
<p class=MsoNormal><span lang=EN-US>blittable</span><span style='font-family:
宋体'>数据类型在</span><span lang=EN-US>.NET</span><span style='font-family:宋体'>和</span><span
lang=EN-US>COM</span><span style='font-family:宋体'>中有公共的表示法，不需要转换。简单的数据类型如</span><span
lang=EN-US>byte</span><span style='font-family:宋体'>、</span><span lang=EN-US>short</span><span
style='font-family:宋体'>、</span><span lang=EN-US>int</span><span
style='font-family:宋体'>和</span><span lang=EN-US>long</span><span
style='font-family:宋体'>，仅包含这些简单数据类型的类和数组都属于</span><span lang=EN-US>blittable</span><span
style='font-family:宋体'>数据类型。</span><span lang=EN-US>blittable</span><span
style='font-family:宋体'>类型的数组必须是一维的。</span></p>
<p class=MsoNormal><span lang=EN-US>non-blittable</span><span style='font-family:
宋体'>数据类型需要进行转换。表</span><span lang=EN-US>28-1</span><span style='font-family:
宋体'>列出了一些</span><span lang=EN-US>non-blittable</span><span style='font-family:
宋体'>的</span><span lang=EN-US>COM</span><span style='font-family:宋体'>数据类型及其对应的</span><span
lang=EN-US>.NET</span><span style='font-family:宋体'>数据类型。</span><span
lang=EN-US>non-blittable</span><span style='font-family:宋体'>数据类型需要转换，所以需要更多的性能支持。</span></p>
<p class=a4 style='margin-top:8.15pt'><span style='font-family:黑体'>表</span><span
lang=EN-US> 28-1</span></p>
<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0
style='border-collapse:collapse;border:none'>
<tr>
<td width=300 valign=top style='width:225.1pt;border:solid windowtext 1.0pt;
border-left:none;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a1><span lang=EN-US>COM</span><span style='font-family:黑体'>数据类型</span></p>
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<td width=300 valign=top style='width:225.1pt;border-top:solid windowtext 1.0pt;
border-left:none;border-bottom:solid windowtext 1.0pt;border-right:none;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a1><span lang=EN-US>.NET</span><span style='font-family:黑体'>数据类型</span></p>
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none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
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<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>SAFEARRAY</span></p>
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padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>Array</span></p>
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<td width=300 valign=top style='width:225.1pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>VARIANT</span></p>
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<td width=300 valign=top style='width:225.1pt;border:none;border-bottom:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>Object</span></p>
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</tr>
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<td width=300 valign=top style='width:225.1pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>BSTR</span></p>
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padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>String</span></p>
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<td width=300 valign=top style='width:225.1pt;border-top:none;border-left:
none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>IUnknown*,IDispatch*</span></p>
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<td width=300 valign=top style='width:225.1pt;border:none;border-bottom:solid windowtext 1.0pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=a3 style='margin-left:10.7pt'><span lang=EN-US>Object</span></p>
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