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<TD width="95%" height=29><PRE><B><FONT color=#000080><A name=_Toc419881661><SPAN style="mso-bookmark: _Toc419740479"><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">五 </SPAN><SPAN lang=EN-US style="LAYOUT-GRID-MODE: line">Visual C++</SPAN></SPAN></A><SPAN style="LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bookmark: _Toc419740479; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">与多媒体</SPAN></FONT></B></PRE></TD>
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<H2 style="mso-line-height-alt: 1.3pt"><A name=_Toc419881665><SPAN
lang=EN-US
style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-bookmark: _Toc419740483; mso-hansi-font-family: MS Sans Serif">2
多媒体文件</SPAN></A><SPAN lang=EN-US
style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-bookmark: _Toc419740483; mso-hansi-font-family: Arial">I/O</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 18pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: Arial"><O:P>
</O:P></SPAN></H2>
<P class=MsoNormal
style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">多媒体文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">与普通文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">相似，但支持多媒体“</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">RIFF</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">”格式，并提供了缓冲和非缓冲文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">所有的多媒体文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">函数名前缀为</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">mmio</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">，消息名前缀为</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">MMIO</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-outline-level: 1"><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">低级波形音频函数：<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></B></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">低级音频服务允许用户直接与音频设备驱动程序打交道，直接控制音频设备如波形，</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">Midi</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">的播放与记录，低级音频函数是一个设备无关接口。<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">低级音频函数前缀均为</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wave</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">，按输入函数、输出函数区分为</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">WaveIn</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">××××和</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">WaveOut</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">××××。</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-outline-level: 1"><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">波形音频的重放过程。<SPAN
lang=EN-US><O:P> </O:P></SPAN></SPAN></B></P>
<P class=MsoNormal
style="WORD-BREAK: break-all; TEXT-INDENT: 20pt; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple"><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">首先，我们要调用多媒体文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O函数mmIO</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">××××</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">(<SPAN
style="mso-spacerun: yes"> </SPAN>)，</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">并根据多媒体文件</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">I/O</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">生成在</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wave</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">重放中需要的结构和数据，并将这些结构和数据用</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">waveOut</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">××××</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">(<SPAN
style="mso-spacerun: yes"> </SPAN>)</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">函数重放。</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">
</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">用户可以根据加密的需要将</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'">wave</SPAN><SPAN
style="FONT-SIZE: 10.5pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'MS Sans Serif'">文件篡改，去掉文件头和“</SPAN><SPAN
lang=EN-US
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