_ocr_example_image_view_8cpp-source.html

基于symbian 平台 ocr 示例程序

<a name="l00237"></a>00237 
<a name="l00238"></a>00238 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00239"></a>00239 <span class="comment">// COcrExampleImageView::HandleSizeChange</span>
<a name="l00240"></a>00240 <span class="comment">// Handle screen size change.</span>
<a name="l00241"></a>00241 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00242"></a>00242 <span class="comment">//</span>
<a name="l00243"></a><a class="code" href="class_c_ocr_example_image_view.html#04bbd31ba9f2f99b17c69030e5cf96cb">00243</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#04bbd31ba9f2f99b17c69030e5cf96cb">COcrExampleImageView::HandleSizeChange</a>()
<a name="l00244"></a>00244     {
<a name="l00245"></a>00245     <span class="keywordflow">if</span> (<a class="code" href="class_c_ocr_example_image_view.html#6dc94c8cd7c107bc61701348814020e6">iContainer</a>)
<a name="l00246"></a>00246         {
<a name="l00247"></a>00247         TRect mainPaneRect;
<a name="l00248"></a>00248         AknLayoutUtils::LayoutMetricsRect(AknLayoutUtils::EMainPane, mainPaneRect);
<a name="l00249"></a>00249 
<a name="l00250"></a>00250         <span class="comment">// if image is loaded, re-scale it</span>
<a name="l00251"></a>00251         <span class="keywordflow">if</span> ((<a class="code" href="class_c_ocr_example_image_view.html#56132cb68e64726ad0658571e44e9644">iHandler</a>) &amp;&amp; (<a class="code" href="class_c_ocr_example_image_view.html#9eb6fa3188758350a81b83400892e787">iBitMap</a>))
<a name="l00252"></a>00252             {
<a name="l00253"></a>00253             TRAP_IGNORE(<a class="code" href="class_c_ocr_example_image_view.html#56132cb68e64726ad0658571e44e9644">iHandler</a>-&gt;<a class="code" href="class_n_o_c_r_utils_1_1_c_image_handler.html#5321ab83edffb2d7f3815c37aaaaad51">FitToScreenL</a>( mainPaneRect.Size() ));
<a name="l00254"></a>00254             }
<a name="l00255"></a>00255 
<a name="l00256"></a>00256         <a class="code" href="class_c_ocr_example_image_view.html#6dc94c8cd7c107bc61701348814020e6">iContainer</a>-&gt;SetRect(mainPaneRect);
<a name="l00257"></a>00257         }
<a name="l00258"></a>00258     }
<a name="l00259"></a>00259 
<a name="l00260"></a>00260 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00261"></a>00261 <span class="comment">// COcrExampleImageView::ImageOperationCompleteL()</span>
<a name="l00262"></a>00262 <span class="comment">// callback function called by ImageHandler, when an image has been loaded or</span>
<a name="l00263"></a>00263 <span class="comment">// scaled</span>
<a name="l00264"></a>00264 <span class="comment">// ----------------------------------------------------------------------------</span>
<a name="l00265"></a>00265 <span class="comment">//</span>
<a name="l00266"></a><a class="code" href="class_c_ocr_example_image_view.html#09a548f36fef23b5490ecdf57e2bdd1a">00266</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#09a548f36fef23b5490ecdf57e2bdd1a">COcrExampleImageView::ImageOperationCompleteL</a>(TInt aError)
<a name="l00267"></a>00267     {
<a name="l00268"></a>00268     <a class="code" href="class_c_ocr_example_image_view.html#a7f5826c4c1c2cbee83739946a8a013b">iBackgroundTaskDone</a> = ETrue; <span class="comment">// to dismiss wait-note</span>
<a name="l00269"></a>00269     <span class="keywordflow">if</span> (aError)
<a name="l00270"></a>00270         {
<a name="l00271"></a>00271         _LIT(KFailed,<span class="stringliteral">"Loading/scaling image failed"</span>);
<a name="l00272"></a>00272         <a class="code" href="class_c_ocr_example_image_view.html#5d97b3005d7025da3ce0f8f008328e43">DisplayWarningL</a>(KFailed, aError);
<a name="l00273"></a>00273         }
<a name="l00274"></a>00274     <span class="keywordflow">else</span>
<a name="l00275"></a>00275         {
<a name="l00276"></a>00276         <span class="comment">// we should now have the image and also another one (resized to fit</span>
<a name="l00277"></a>00277         <span class="comment">// the screen). Calculate the factors (needed later, when adjusting</span>
<a name="l00278"></a>00278         <span class="comment">// TRect-info analyzed from the original image)</span>
<a name="l00279"></a>00279         <span class="comment">//</span>
<a name="l00280"></a>00280         <a class="code" href="class_c_ocr_example_image_view.html#e72899bf23845a10c6b7559c2e896baa">iData</a>.<a class="code" href="class_t_screen_update_data.html#d8df217ecaec20976c2b240f971a5034">iRectScaler</a>.<a class="code" href="class_n_o_c_r_utils_1_1_t_rect_scaler.html#a6b4fc57b5dda0378f9f21a73f7bdb13">CalculateFactor</a>(<a class="code" href="class_c_ocr_example_image_view.html#9eb6fa3188758350a81b83400892e787">iBitMap</a>-&gt;SizeInPixels(),
<a name="l00281"></a>00281                                           <a class="code" href="class_c_ocr_example_image_view.html#e72899bf23845a10c6b7559c2e896baa">iData</a>.<a class="code" href="class_t_screen_update_data.html#ea6eefa2a3b0315b12fbb5ab0532a849">iScaledBitMap</a>-&gt;SizeInPixels());
<a name="l00282"></a>00282         <span class="keywordflow">if</span> (<a class="code" href="class_c_ocr_example_image_view.html#63052a309baec315239b427aa7647b76">iState</a> == <a class="code" href="class_c_ocr_example_image_view.html#8e0e9e3030ee220d737a3e9e733390ec553253ec36b6a826ce4923c5dcf95a12">EInit</a>)
<a name="l00283"></a>00283             {
<a name="l00284"></a>00284             <a class="code" href="class_c_ocr_example_image_view.html#63052a309baec315239b427aa7647b76">iState</a> = <a class="code" href="class_c_ocr_example_image_view.html#8e0e9e3030ee220d737a3e9e733390ecc7b1c96e80ea74eab865de4fc9f448ea">EImageOpened</a>;
<a name="l00285"></a>00285             }
<a name="l00286"></a>00286         <a class="code" href="class_c_ocr_example_image_view.html#6dc94c8cd7c107bc61701348814020e6">iContainer</a>-&gt;DrawDeferred();
<a name="l00287"></a>00287         }
<a name="l00288"></a>00288     }
<a name="l00289"></a>00289 
<a name="l00290"></a><a class="code" href="class_c_ocr_example_image_view.html#3a8345b1114dbca51373caaf97b3bd53">00290</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#3a8345b1114dbca51373caaf97b3bd53">COcrExampleImageView::DialogDismissedL</a>(TInt <span class="comment">/*aButtonId*/</span>)
<a name="l00291"></a>00291     {
<a name="l00292"></a>00292     <span class="comment">// no implementation needed</span>
<a name="l00293"></a>00293     }
<a name="l00294"></a>00294 
<a name="l00295"></a><a class="code" href="class_c_ocr_example_image_view.html#34fc7596f70aed6415e69cc09bec0968">00295</a> TBool <a class="code" href="class_c_ocr_example_image_view.html#34fc7596f70aed6415e69cc09bec0968">COcrExampleImageView::IsProcessDone</a>()<span class="keyword"> const</span>
<a name="l00296"></a>00296 <span class="keyword">    </span>{
<a name="l00297"></a>00297     <span class="keywordflow">return</span> <a class="code" href="class_c_ocr_example_image_view.html#a7f5826c4c1c2cbee83739946a8a013b">iBackgroundTaskDone</a>;
<a name="l00298"></a>00298     }
<a name="l00299"></a>00299 
<a name="l00300"></a><a class="code" href="class_c_ocr_example_image_view.html#9fadb422c50df5ad198f645d92cf408c">00300</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#9fadb422c50df5ad198f645d92cf408c">COcrExampleImageView::ProcessFinished</a>()
<a name="l00301"></a>00301     {
<a name="l00302"></a>00302     <a class="code" href="class_c_ocr_example_image_view.html#a7f5826c4c1c2cbee83739946a8a013b">iBackgroundTaskDone</a> = EFalse;
<a name="l00303"></a>00303     }
<a name="l00304"></a>00304 
<a name="l00305"></a><a class="code" href="class_c_ocr_example_image_view.html#2b047861e8a98fc470be28703b1bd9d0">00305</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#2b047861e8a98fc470be28703b1bd9d0">COcrExampleImageView::StepL</a>()
<a name="l00306"></a>00306     {
<a name="l00307"></a>00307     <span class="comment">// no implementation needed</span>
<a name="l00308"></a>00308     }
<a name="l00309"></a>00309 
<a name="l00310"></a><a class="code" href="class_c_ocr_example_image_view.html#41df03d3f25580af9a93f5af442ce677">00310</a> TBool <a class="code" href="class_c_ocr_example_image_view.html#41df03d3f25580af9a93f5af442ce677">COcrExampleImageView::ExecuteWaitNoteL</a>()
<a name="l00311"></a>00311     {
<a name="l00312"></a>00312         CAknWaitNoteWrapper* waitNote = CAknWaitNoteWrapper::NewL();
<a name="l00313"></a>00313 
<a name="l00314"></a>00314         <span class="comment">// Required reinterpret_cast as CAknWaitNoteWrapper inherits privately</span>
<a name="l00315"></a>00315         <span class="comment">// from CActive</span>
<a name="l00316"></a>00316         CleanupStack::PushL(reinterpret_cast&lt;CBase*&gt;(waitNote));
<a name="l00317"></a>00317 
<a name="l00318"></a>00318         <span class="comment">// this is a blocking call</span>
<a name="l00319"></a>00319         TBool completed = waitNote-&gt;ExecuteL(R_OCR_WAITNOTE, *<span class="keyword">this</span>);
<a name="l00320"></a>00320 
<a name="l00321"></a>00321         CleanupStack::PopAndDestroy(waitNote);
<a name="l00322"></a>00322 
<a name="l00323"></a>00323         <span class="keywordflow">return</span> completed;
<a name="l00324"></a>00324     }
<a name="l00325"></a>00325 
<a name="l00326"></a>00326 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00327"></a>00327 <span class="comment">// COcrExampleImageView::DisplayWarningL()</span>
<a name="l00328"></a>00328 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00329"></a>00329 <span class="comment">//</span>
<a name="l00330"></a><a class="code" href="class_c_ocr_example_image_view.html#5d97b3005d7025da3ce0f8f008328e43">00330</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#5d97b3005d7025da3ce0f8f008328e43">COcrExampleImageView::DisplayWarningL</a>( <span class="keyword">const</span> TDesC &amp;aDescr, TInt aErr)<span class="keyword"> const</span>
<a name="l00331"></a>00331 <span class="keyword">    </span>{
<a name="l00332"></a>00332     ASSERT( aErr != KErrNone );
<a name="l00333"></a>00333 
<a name="l00334"></a>00334     _LIT(KFailed,<span class="stringliteral">"%S: %d"</span>);
<a name="l00335"></a>00335     CAknWarningNote* note = <span class="keyword">new</span> (ELeave) CAknWarningNote(ETrue);
<a name="l00336"></a>00336     TBuf&lt;128&gt; text;
<a name="l00337"></a>00337     text.Format(KFailed, &amp;aDescr, aErr);
<a name="l00338"></a>00338     note-&gt;ExecuteLD( text );
<a name="l00339"></a>00339     }
<a name="l00340"></a>00340 
<a name="l00341"></a>00341 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00342"></a>00342 <span class="comment">// COcrExampleImageView::OpenImageL()</span>
<a name="l00343"></a>00343 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00344"></a>00344 <span class="comment">//</span>
<a name="l00345"></a><a class="code" href="class_c_ocr_example_image_view.html#2003512dd8696219849f58d8ae1e3c37">00345</a> <span class="keywordtype">void</span> <a class="code" href="class_c_ocr_example_image_view.html#2003512dd8696219849f58d8ae1e3c37">COcrExampleImageView::OpenImageL</a>()
<a name="l00346"></a>00346     {
<a name="l00347"></a>00347     <span class="comment">// use dialog</span>
<a name="l00348"></a>00348     _LIT(KTitle, <span class="stringliteral">"Select image file"</span>);
<a name="l00349"></a>00349     TFileName file(KNullDesC);
<a name="l00350"></a>00350     <span class="keywordflow">if</span> (AknCommonDialogs::RunSelectDlgLD(file, R_OCR_SELECT_DIALOG, KTitle))
<a name="l00351"></a>00351         {
<a name="l00352"></a>00352         <span class="comment">// close possible previously loaded image</span>
<a name="l00353"></a>00353         <a class="code" href="class_c_ocr_example_image_view.html#7561e6dda22ddb24f4b8c58d0229ebc5">CloseImage</a>();
<a name="l00354"></a>00354 
<a name="l00355"></a>00355         TRect mainPaneRect;
<a name="l00356"></a>00356         AknLayoutUtils::LayoutMetricsRect(AknLayoutUtils::EMainPane, mainPaneRect);
<a name="l00357"></a>00357         TRAPD(err, <a class="code" href="class_c_ocr_example_image_view.html#56132cb68e64726ad0658571e44e9644">iHandler</a>-&gt;<a class="code" href="class_n_o_c_r_utils_1_1_c_image_handler.html#0135e243bf1c2ba8db5d62edc631e3d4">LoadFileAndScaleL</a>( file, mainPaneRect.Size() ));
<a name="l00358"></a>00358         <span class="keywordflow">if</span> (err)
<a name="l00359"></a>00359             {
<a name="l00360"></a>00360             _LIT(KFileLoadFailed,<span class="stringliteral">"Opening image file failed"</span>);
<a name="l00361"></a>00361             <a class="code" href="class_c_ocr_example_image_view.html#5d97b3005d7025da3ce0f8f008328e43">DisplayWarningL</a>(KFileLoadFailed, err);
<a name="l00362"></a>00362             }
<a name="l00363"></a>00363         <span class="keywordflow">else</span>
<a name="l00364"></a>00364             {