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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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<P class=MsoNormal
style="WORD-BREAK: break-all; mso-line-height-alt: 1.3pt; mso-pagination: none; mso-outline-level: 1; mso-layout-grid-align: none; punctuation-wrap: simple"><FONT
color=#000080><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'">程序员调用</SPAN></B></FONT><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-hansi-font-family: 'Times New Roman'"><FONT
color=#000080>FLC流程</FONT><O:P> </O:P></SPAN></B></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l77 level1 lfo104"><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'">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</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: 'Times New Roman'">用<SPAN
lang=EN-US>Open(LPCSTR lpszFile,int
id)函数打开FLC文件，其参数lpszFile指要打开的文件名，参数id意义与类BMP中Open函数相同，值为零表示使用FLC文件中内建的调色板，否则忽略这个调色板，当在屏幕上播放多个动画或既有动画又有图片时要用到这个参数。程序首先打开指定文件，读入文件头，根据文件头信息申请内存建立内存位图，初始化部分参数，并将文件指针指向文件起始数据区。<O:P>
</O:P></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l77 level1 lfo104"><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'">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></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'">PlayFlc(HWND
hwnd,WORD xorg,WORD yorg,WORD
wm_notify)开始播放动画。在类FLCW内部，用参数fStatus决定动画播放与否，只要这个参数值为FLC_PLAYING，</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'">就播放动画，我们还可以用这个参数检验当前播放状态，函数<SPAN
lang=EN-US>QueryFlc()就是返回</SPAN></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'">fStatus</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'">值。参数</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'">xorg和yorg指定播放位置，假如在播放过程中想移动位置，可以用这个函数重新指定。参数wm_notify指定当动画播放完成后将发送什么消息给父窗口。<O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l77 level1 lfo104"><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'">3.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></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'">FlcIdle()函数是使用整个FLC类的关键。由于FLC播放是一个过程，不是一转眼就能完成的事，我们当然不能把整个程序的控制权交给它，让它播放完后再交回来，只好每隔一段时间关照它一下，让它检查一下现在的状态，假如时间到了，可以播放下一帧了，就放下一帧后返回，否则直接返回。因此在程序中需要有一个定时器，不停地调用FlcIdle。在FlcIdle函数中，核心又是if(GetTickCount()>=dwNextTime)PlayFlcAFrame()函数，这个函数的作用是检测是否到了播放下一帧的时间，然后调用PlayFlcAFrame函数播放下一帧。<O:P>
</O:P></SPAN></P>
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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-outline-level: 1; mso-layout-grid-align: none; punctuation-wrap: simple"><B
style="mso-bidi-font-weight: normal"><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'">FLC</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'">播放单帧图片机理</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></B></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l38 level1 lfo105"><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'">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></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'">PlayFlcAFrame()，PlayFlcAFrame()的作用是逐帧播放FLC，它首先调用ReadFrame()函数，如读取成功则使用MYDIB类函数Show将内存位图拷贝至屏幕。<O:P>
</O:P></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt; WORD-BREAK: break-all; TEXT-INDENT: -18pt; mso-line-height-alt: 1.3pt; tab-stops: list 18.0pt; mso-pagination: none; mso-layout-grid-align: none; punctuation-wrap: simple; mso-list: l38 level1 lfo105"><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'">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></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'">ReadFrame()，ReadFrame()函数是整个FLC类的核心所在，它的作用是读取文件数据，再将数据解码至内存中。其操作过程如下：读取帧头，获取当前帧内块数，循环读取块头、块数据，根据块类型解码数据至内存位图中。块类型FLI_COLOR_256、FLI_WORLD_LC、FLI_LC、FLI_BALCK、FLI_BRUN、FLI_COPY分别对应于函数DecodeColor()、DecodeDeltaFlc()、DecodeDeltaFli()、DecodeBlack()、DecodeBRun()、DecodeCopy()。<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"><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-outline-level: 1; mso-layout-grid-align: none; punctuation-wrap: simple"><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: 'Times New Roman'">实例分析<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: 'Times New Roman'">在这个实例中，我们要在一个窗口中同时播放三个<SPAN
lang=EN-US>FLC动画，注意这三个动画的调色板是不同的，为了协调这三个动画的颜色，干脆这三个调色板一个都不要，使用一个photoshop内置公用调色板，这个调色板在二百五十六种颜色范围内，采用每种颜色兼顾一点的办法，在实际应用中，要使用抖动算法才能模拟出与原来颜色乱真的效果，在此自己算太累，系统又不提供算法，况且这个算法与我们的主题关系不大，因此你看到的颜色会有些失真，除非系统设置大于二百五十六色。<O:P>
</O:P></SPAN></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: 'Times New Roman'">建立一个基于对话框的应用程序<SPAN
lang=EN-US>playflc，在类CPlayflcDlg内定义三个FLCW类flc，外加一个BMP类bmp，bmp类的作用是取得一个调色板，我们已事先用photoshop作了一个长宽分别为1</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'">比</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'">1的图片，当然它包含了公用调色板的信息。在对话框初始化过程函数OnInitDialog()中，我们设定一个定时器，并分别读入文件1.flc、2.flc、3.flc、1.bmp，注意读FLC</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'">时第二个</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'">参数为<SPAN
lang=EN-US>(PALETTE*)&bmp，这就是告诉程序使用bmp的调色板。我们打算当用户按下ok键时开始播放动画，因此增加一个按键响应函数OnOK()
，添加三个PlayFlc函数，在定时器响应过程函数中填入三个FlcIdle函数。运行程序。</SPAN></SPAN></P>
<P align=center><SPAN style="mso-ignore: vglayout"><IMG height=258
src="book_text20.files/book_t1.gif" width=357
v:shapes="_x0000_s1026"></SPAN><BR><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">图5.5<O:P>
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