c# - WPF Image: .Source = Clipboard.GetImage() is not displayed -


this simple program not work, image not appear in window.

namespace clipboardtest {     public partial class mainwindow : window     {         public mainwindow()         {             initializecomponent();         }         private void copybutton_click(object sender, routedeventargs e)         {             if (clipboard.containsimage())             {                 imageuielement.source = clipboard.getimage();                 console.writeline("clipboard copied uielement");             }             else             {                 console.writeline("no image in clipboard");             }         }     }  }

output "clipboard copied uielement", image not appear in window.

xaml:

 <window x:class="clipboardtest.mainwindow"          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"          title="mainwindow" height="350" width="525">      <grid>          <button x:name="copybutton" content="copy" horizontalalignment="left" margin="10,10,0,0" verticalalignment="top" width="75" click="copybutton_click"/>          <image x:name="imageuielement" margin="90,10,10,10"/>      </grid>  </window>

is there anybody, understands, wrong?

use clipboard.getdataobject bitmap , convert bitmapsource. also, aware bitmap.gethbitmap() leaks memory unless call deleteobject on it.

so, correct solution dispose intptr after use. declare method @ class level , use code:

// @ class level [system.runtime.interopservices.dllimport("gdi32.dll")] public static extern bool deleteobject(intptr hobject); 
if (clipboard.containsimage()) {     idataobject clipboarddata = clipboard.getdataobject();     if (clipboarddata != null)     {         if (clipboarddata.getdatapresent(system.windows.forms.dataformats.bitmap))         {             system.drawing.bitmap bitmap = (system.drawing.bitmap)clipboarddata.getdata(system.windows.forms.dataformats.bitmap);             intptr hbitmap = bitmap.gethbitmap();             try             {                 imageuielement.source = system.windows.interop.imaging.createbitmapsourcefromhbitmap(hbitmap, intptr.zero, int32rect.empty, bitmapsizeoptions.fromemptyoptions());                 console.writeline("clipboard copied uielement");             }                          {                 deleteobject(hbitmap)             }         }     } }

source - msdn , memory leak in bitmap.


Comments

Post a Comment

Popular posts from this blog

javascript - RequestAnimationFrame not working when exiting fullscreen switching space on Safari -

request animation frame stops working when exiting fullscreen clicking on original space's safari window. fine if fullscreen mode canceled escape key or calling cancelfullscreen(). steps reproduce: open https://dl.dropboxusercontent.com/u/769042/prezi/safari-fullscreen.html click "draw raf", kittie appears click "fullscreen", go fullscreen click "draw raf", kittie appears go space original safari was, showing "click exit fullscreen mode", click anywhere, out fullscreen click "draw raf", nothing happens what handling click calling: window.requestanimationframe(draw); which draws on canvas context: function draw() { ctx.drawimage(img, math.random()*500|0, math.random()*400|0, 100, 100); } i checked .hidden , .visibilitystate, updated correctly. tested on osx 10.9.3, safari 7.0.4 (9537.76.4). has workaround/solution other switching old settimeout? this sounds webkit bug 88940 : using reque...
Read more

jsf - How to ajax update an item in the footer of a PrimeFaces dataTable? -

this visual of table have: +---------+------------+-------------------+ | header1 | header2 | header3 | +---------+------------+-------------------+ | row | input | calc'ed output | | row b | input b | calc'ed output b | | etc.. | etc.. | etc.. | +---------+------------+-------------------+ | total: total calc'ed output | +------------------------------------------+ and stripped-down code: <p:datatable id="mytable" value="#{mybean.somelist}" var="currentitem"> <p:column headertext="header1"> <h:outputtext value="#{currentitem.name}" /> </p:column> <p:column headertext="header2"> <pe:inputnumber value="#{currentitem.inputval}"> <p:ajax event="change" listener="#{mybean.changelistener}" update="outputval outputtotal...
Read more

jquery - Keeping Kendo Datepicker in min/max range -

when user types type in date outside of range, we're trying ensure date gets changed closest min/max. text displayed in date picker not change though thought script changing value() @(html.kendo() .datepickerfor(x => x.dob) .max(new datetime(datetime.now.addyears(-18).year, datetime.now.addyears(-18).month, datetime.now.addyears(-18).day)) .min(new datetime(datetime.now.addyears(-70).year, datetime.now.addyears(-70).month, datetime.now.addyears(-70).day)) .events(e=>e.change("ondobchange")) .htmlattributes(new { required = "required", ng_model = "model.dob" })) <p ng-show="validatestate.submitted && frmmain.dob.$invalid" class="help-block">please select</p> <script> function ondobchange(e) { var d...
Read more