📄 6-2.htm
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<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>LPBYTE pPrinterEnum,<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>DWORD cbBuf,<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>LPDWORD pcbNeeded,<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>LPDWORD pcReturned,<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>) ;<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>函数各参数按顺序描述如下：</span></span></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0
style='margin-left:32.4pt;border-collapse:collapse;mso-padding-alt:0cm 5.4pt 0cm 5.4pt'>
<tr style='mso-yfti-irow:0'>
<td width=117 valign=top style='width:87.8pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>Flags<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>表明所需打印机类型的标志</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
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<tr style='mso-yfti-irow:1'>
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<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>Name<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>打印机对象的名称</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
</tr>
<tr style='mso-yfti-irow:2'>
<td width=117 valign=top style='width:87.8pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>Level<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>打印机信息结构的类型</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
</tr>
<tr style='mso-yfti-irow:3'>
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<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>pPrintereEum<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>指向打印机信息结构的指针</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
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</tr>
<tr style='mso-yfti-irow:4'>
<td width=117 valign=top style='width:87.8pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>cbBuf<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>打印机信息数组的大小</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
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</tr>
<tr style='mso-yfti-irow:5'>
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<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>pcbNeeded<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>指向保存复制到打印机信息数组中的字节数变量的指针</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
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<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>pcReturned<o:p></o:p></span></span></p>
</td>
<span style='mso-bookmark:_Toc16587483'></span>
<td width=358 valign=top style='width:268.5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>指向保存复制到数组中的打印机信息结构的变量的指针</span></span><span
style='mso-bookmark:_Toc16587483'><span lang=EN-US style='mso-bidi-font-size:
10.5pt'><o:p></o:p></span></span></p>
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</tr>
</table>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>其中某些参数根据打印机的不同描述而具有许多不同的值。但是，大部分情况下，关心的只是获得缺省的打印机。为了对应用程序进行编程，以便要求</span><span
lang=EN-US>Windows</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>提供缺省的打印机，可使用如下代码：</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>PRINTER_INFO_5
printerInfo5[3] ;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>DWORD needed,
returned;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 5, (LPBYTE) printerInfo5,<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
lang=EN-US style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>sizeof(printerInfo5) ,
&needed, &returned) ;<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>如果上述代码段执行成功，那么在第一个打印机信息结构的</span><span lang=EN-US>pPrinteName</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>成员中就有了缺省打印机的名称。可以按以下方式来访问该成员：</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>printerInfo5[0].pPrinterName<o:p></o:p></span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>为了给打印机创建</span><span lang=EN-US>DC</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，需要准确地知道打印机名称。为了获得该</span><span
lang=EN-US>DC</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>，可调用</span><span lang=EN-US>CreateDC() </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>：</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>HDC printDC;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>printDC =
CreateDC(NULL, printerInfo5[0].pPrinterName, NULL, NULL) ;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>这里，把打印机的系统名称作为第二个参数，其余参数都应该为</span><span lang=EN-US>NULL</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>。</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>一旦有了用户打印机的</span><span lang=EN-US>DC</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，就可以开始打印文档。首先，调用</span><span
lang=EN-US>Windows API</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>函数</span><span lang=EN-US>StartDoc() </span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，开始把文档发送到系统的后台打印程序中。函数调用成功则返回打印机任务的标识符；否则返回小于或等于零的值。</span></span></p>
<p class=MsoNormal style='text-indent:21.0pt'><span style='mso-bookmark:_Toc16587483'><span
lang=EN-US>StartDoc() </span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>的一个参数是指向</span><span lang=EN-US>DOCINFO</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>结构的指针。必须初始化此结构的成员才能调用</span><span
lang=EN-US>StartDoc() </span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>。在大多数情况下，只需将此结构的大小放在</span><span lang=EN-US>cbSize</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>成员中，把指向文档名称的指针放在</span><span
lang=EN-US>lpszDocName</span></span><span style='mso-bookmark:_Toc16587483'><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>成员中，其余成员可以是</span><span lang=EN-US>NULL</span></span><span
style='mso-bookmark:_Toc16587483'><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>或零。整个过程类似于如下形式：</span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>char docName[] =
“RectangleDoc” ;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>DOCINFO docInfo;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'> </span>docInfo.cbSize =
sizeof(docInfo) ;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>docInfo.lpszDocName = docName;<o:p></o:p></span></span></p>
<p class=MsoNormal><span style='mso-bookmark:_Toc16587483'><span lang=EN-US
style='font-size:9.0pt'><span
style='mso-spacerun:yes'>
</span>docInfo.lpszOutput = NULL;<o:p></o:p></span></span></p>
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