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POExtTextOut fails with very long strings unless lower font quality specified
 

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  1. POExtTextOut fails with very long strings unless lower font quality specified
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    <p>Sometimes our application needs to draw very long strings (e.g. 6,000 chars) using ExtTextOut. Sometimes ExtTextOut fails and returns zero and GetLastError returns zero as well.</p> <p>To re-create the situation create a simple MFC Single Document application and then set the OnDraw to be:</p> <pre><code>void CTestExtTextView::OnDraw(CDC* pDC) { CTestExtTextDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; LOGFONT lfDetail = {0}; lfDetail.lfHeight = -(::MulDiv(100, pDC-&gt;GetDeviceCaps(LOGPIXELSY), 720)); lfDetail.lfCharSet = ANSI_CHARSET; lfDetail.lfOutPrecision = OUT_DEFAULT_PRECIS; lfDetail.lfQuality = CLEARTYPE_QUALITY; lfDetail.lfWeight = 400; _tcscpy_s(lfDetail.lfFaceName, LF_FACESIZE, _T("Arial")); CFont font; font.CreateFontIndirectW( &amp;lfDetail ); CFont * pold = pDC-&gt;SelectObject( &amp;font ); CString str = L"2 &lt;office:document-content xmlns:office=\"urn:oasis:names:tc:opendocument:xmlns:office:1.0\" xmlns:style=\"urn:oasis:names:tc:opendocument:xmlns:style:1.0\" xmlns:text=\"urn:oasis:names:tc:opendocument:xmlns:text:1.0\" xmlns:table=\"urn:oasis:names:tc:opendocument:xmlns:table:1.0\" xmlns:draw=\"urn:oasis:names:tc:opendocument:xmlns:drawing:1.0\" xmlns:fo=\"urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:dc=\"http://purl.org/dc/elements/1.1/\" xmlns:meta=\"urn:oasis:names:tc:opendocument:xmlns:meta:1.0\" xmlns:number=\"urn:oasis:names:tc:opendocument:xmlns:datastyle:1.0\" xmlns:presentation=\"urn:oasis:names:tc:opendocument:xmlns:presentation:1.0\" xmlns:svg=\"urn:oasis:names:tc:opendocument:xmlns:svg-compatible:1.0\" xmlns:chart=\"urn:oasis:names:tc:opendocument:xmlns:chart:1.0\" xmlns:dr3d=\"urn:oasis:names:tc:opendocument:xmlns:dr3d:1.0\" xmlns:math=\"http://www.w3.org/1998/Math/MathML\" xmlns:form=\"urn:oasis:names:tc:opendocument:xmlns:form:1.0\" xmlns:script=\"urn:oasis:names:tc:opendocument:xmlns:script:1.0\" xmlns:ooo=\"http://openoffice.org/2004/office\" xmlns:ooow=\"http://openoffice.org/2004/writer\" xmlns:oooc=\"http://openoffice.org/2004/calc\" xmlns:dom=\"http://www.w3.org/2001/xml-events\" xmlns:xforms=\"http://www.w3.org/2002/xforms\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" office:version=\"1.1\"&gt;&lt;office:scripts/&gt;&lt;office:font-face-decls&gt;&lt;style:font-face style:name=\"Arial\" svg:font-family=\"Arial\" style:font-family-generic=\"swiss\" style:font-pitch=\"variable\"/&gt;&lt;style:font-face style:name=\"Arial Unicode MS\" svg:font-family=\"&amp;apos;Arial Unicode MS&amp;apos;\" style:font-family-generic=\"system\" style:font-pitch=\"variable\"/&gt;&lt;style:font-face style:name=\"Tahoma\" svg:font-family=\"Tahoma\" style:font-family-generic=\"system\" style:font-pitch=\"variable\"/&gt;&lt;/office:font-face-decls&gt;&lt;office:automatic-styles&gt;&lt;style:style style:name=\"co1\" style:family=\"table-column\"&gt;&lt;style:table-column-properties fo:break-before=\"auto\" style:column-width=\"6.659cm\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"co2\" style:family=\"table-column\"&gt;&lt;style:table-column-properties fo:break-before=\"auto\" style:column-width=\"7.408cm\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"co3\" style:family=\"table-column\"&gt;&lt;style:table-column-properties fo:break-before=\"auto\" style:column-width=\"7.02cm\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"co4\" style:family=\"table-column\"&gt;&lt;style:table-column-properties fo:break-before=\"auto\" style:column-width=\"7.214cm\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"co5\" style:family=\"table-column\"&gt;&lt;style:table-column-properties fo:break-before=\"auto\" style:column-width=\"2.267cm\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"ro1\" style:family=\"table-row\"&gt;&lt;style:table-row-properties style:row-height=\"0.473cm\" fo:break-before=\"auto\" style:use-optimal-row-height=\"true\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"ro2\" style:family=\"table-row\"&gt;&lt;style:table-row-properties style:row-height=\"0.453cm\" fo:break-before=\"auto\" style:use-optimal-row-height=\"true\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"ta1\" style:family=\"table\" style:master-page-name=\"Default\"&gt;&lt;style:table-properties table:display=\"true\" style:writing-mode=\"lr-tb\"/&gt;&lt;/style:style&gt;&lt;style:style style:name=\"T1\" style:family=\"text\"&gt;&lt;style:text-properties style:text-position=\"super 58%\"/&gt;&lt;/style:style&gt;&lt;/office:automatic-styles&gt;&lt;office:body&gt;&lt;office:spreadsheet&gt;&lt;table:table table:name=\"Sheet1\" table:style-name=\"ta1\" table:print=\"false\"&gt;&lt;office:forms form:automatic-focus=\"false\" form:apply-design-mode=\"false\"/&gt;&lt;table:table-column table:style-name=\"co1\" table:default-cell-style-name=\"Default\"/&gt;&lt;table:table-column table:style-name=\"co2\" table:default-cell-style-name=\"Default\"/&gt;&lt;table:table-column table:style-name=\"co3\" table:default-cell-style-name=\"Default\"/&gt;&lt;table:table-column table:style-name=\"co4\" table:default-cell-style-name=\"Default\"/&gt;&lt;table:table-row table:style-name=\"ro1\"&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Sample text for ExtTextOut&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Second Column Sample Text&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;3&lt;text:span text:style-name=\"T1\"&gt;rd&lt;/text:span&gt; Column&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;A More Lengthly bit of text just to make sure we increase the size of the line to something that might make ExtTextOut fail. It doesn&amp;apos;t actually fail if we switch to Anti-Aliased Fonts. Not sure why. It also doesn&amp;apos;t fail if we make the text shorter.&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;/table:table-row&gt;&lt;table:table-row table:style-name=\"ro1\"&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Sample text for ExtTextOut&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Second Column Sample Text&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;3&lt;text:span text:style-name=\"T1\"&gt;rd&lt;/text:span&gt; Column&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;A More Lengthly bit of text just to make sure we increase the size of the line to something that might make ExtTextOut fail. It doesn&amp;apos;t actually fail if we switch to Anti-Aliased Fonts. Not sure why. It also doesn&amp;apos;t fail if we make the text shorter.&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;/table:table-row&gt;&lt;table:table-row table:style-name=\"ro1\"&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Sample text for ExtTextOut&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;&lt;text:p&gt;Second Column Sample Text&lt;/text:p&gt;&lt;/table:table-cell&gt;&lt;table:table-cell office:value-type=\"string\"&gt;"; pDC-&gt;ExtTextOutW( 0,0, NULL, NULL, str, NULL ); pDC-&gt;ExtTextOutW( 0,50, NULL, NULL, CString(L"But this will print out"), NULL ); pDC-&gt;SelectObject( pold ); } </code></pre> <p>When you run the application you should see a single line 'But this will print out' half-way down the screen. If you set lfQuality = ANTIALIASED_QUALITY then it does actually print something out but just doesn't look right.</p> <p>I've tested this on Vista and XP.</p> <p>Any ideas?</p>
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