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<concept id="GUID-A1D2C673-3B91-403A-800B-5E1504FB19EE" xml:lang="en"><title>Capturing

still images</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>To capture still images or to use the display as a viewfinder, build

your application around the Symbian Ecam camera utility. To make use of the

device camera to capture an image, the application needs to repeat the steps

described in the illustration below.</p>

<fig id="GUID-65212152-6862-4990-9869-CF643B9A5845"><title>The steps required to capture a still image</title><image href="GUID-5FE10ECA-1FAB-4E4F-A1D9-67D379EE8CB3_d0e293561_href.png"/></fig>

<note>

<p>The settings you can use in your application depend on what the camera

hardware on the device supports.</p>

</note>

<p>To capture images, use the methods of the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html" format="application/java-archive"><codeph>CCamera</codeph></xref> and <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html" format="application/java-archive"><codeph>MCameraObserver2</codeph></xref> classes to construct your application. <codeph>MCameraObserver2</codeph> uses

the advanced camera features of the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aCCameraAdvancedSettings" format="application/java-archive"><codeph>CCamera::CCameraAdvancedSettings</codeph></xref> class. </p>

<p>For reference examples, see: </p>

<ul>

<li><p><xref href="GUID-55BF8452-F9FF-5CF3-9D74-3BC7F5447551-GENID-1-8-1-18-1-1-4-1-5-1.dita">Camera

Example: Capturing and controlling the images using Camera</xref></p></li>

<li><p><xref href="http://developer.symbian.org/wiki/index.php/Introduction_to_the_Camera_API" scope="external">Introduction to the Camera API</xref> on the Symbian Foundation</p>

</li>

<li><p><xref href="http://www.forum.nokia.com/info/sw.nokia.com/id/9a3e1226-79db-4c8e-bd70-7d9d22aaa6eb/S60_Platform_Camera_Example.html" scope="external">S60 Platform: Camera Example</xref> on Forum Nokia.</p></li>

</ul>

<section id="GUID-7AE307AA-8E1E-4F6C-AFC7-4CED1341D785"><title>To capture still images on a mobile device</title>

<ol>

<li id="GUID-9E819F98-B4C6-4C0B-A723-F82494E8655B"><p>Initialize

the onboard camera.</p>

<ul>

<li><p>Create a camera object using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aNew2L%28MCameraObserver2%20%26amp%3b%2cTInt%2cTInt%29" format="application/java-archive"><codeph>CCamera::New2L()</codeph></xref> method.</p></li>

<li><p>Reserve the camera for your application using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aReserve%28%29" format="application/java-archive"><codeph>CCamera::Reserve()</codeph></xref> method. <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html#%3a%3aMCameraObserver2%3a%3aHandleEvent%28const%20TECAMEvent%20%26amp%3b%29" format="application/java-archive"><codeph>MCameraObserver2::HandleEvent</codeph></xref> is called upon

completion.</p></li>

<li><p>Switch on the camera power using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aPowerOn%28%29" format="application/java-archive"><codeph>CCamera::PowerOn()</codeph></xref> method. <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html#%3a%3aMCameraObserver2%3a%3aHandleEvent%28const%20TECAMEvent%20%26amp%3b%29" format="application/java-archive"><codeph>MCameraObserver2::HandleEvent</codeph></xref> is called upon

completion.</p></li>

<li><p>If needed, share the camera between multiple clients using

the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aNewDuplicate2L%28MCameraObserver2%20%26amp%3b%2cTInt%29" format="application/java-archive"><codeph>CCamera::NewDuplicate2L()</codeph></xref> function. This function

needs the handle of an existing camera object (use <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aHandle%28%29" format="application/java-archive"><codeph>CCamera::Handle()</codeph></xref>).</p></li>

</ul>

</li>

<li id="GUID-1A42718C-0158-4BB6-B99F-48278369C3F3"><p>Configure

the camera settings.</p>

<ul>

<li><p>Before you adjust the settings, make sure the camera hardware

supports the particular option. Use <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aCameraInfo%28TCameraInfo%20%26amp%3b%29const" format="application/java-archive"><codeph>CCamera::CameraInfo()</codeph></xref> to retrieve and <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/TCameraInfoClass.html" format="application/java-archive"><codeph>TCameraInfo</codeph></xref> to

specify the camera information.</p><p>For example, to find out what

image formats are supported by the onboard camera, use the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/TCameraInfoClass.html#%3a%3aTCameraInfo%3a%3aiImageFormatsSupported" format="application/java-archive"><codeph>TCameraInfo::iImageFormatsSupported</codeph></xref> member variable.</p></li>

<li><p>Specify the image format using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aPrepareImageCaptureL%28TFormat%2cTInt%29" format="application/java-archive"><codeph>CCamera::PrepareImageCaptureL</codeph></xref> method. For a list of

possible formats, see <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aTFormat" format="application/java-archive"><codeph>CCamera::TFormat</codeph></xref>.</p><p>Devices support image capture in EXIF JPEG format (<xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aEFormatExif" format="application/java-archive"><codeph>CCamera::EFormatExif</codeph></xref>), which is encoded with

JPEG and requires no additional conversion.</p></li>

<li><p>Specify the desired image size using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aEnumerateCaptureSizes%28TSize%20%26amp%3b%2cTInt%2cTFormat%29const" format="application/java-archive"><codeph>CCamera::EnumerateCaptureSizes()</codeph></xref> method.</p>

</li>

<li><p>Additionally, you can set, for example, the brightness, contrast,

zoom level, flash mode, exposure and white balance of the image. For more

information on the options, see the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aCCameraAdvancedSettings" format="application/java-archive"><codeph>CCamera::CCameraAdvancedSettings</codeph></xref> class. You can also use the settings directly under <codeph>CCamera</codeph>.</p>

</li>

</ul>

<ul>

<li><p>Before you can call <codeph>CCamera::CaptureImage()</codeph>,

allocate memory and set up image format, size and clipping rectangle using

the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aPrepareImageCaptureL%28TFormat%2cTInt%29" format="application/java-archive"><codeph>CCamera::PrepareImageCaptureL()</codeph></xref> method. This

needs to be called only once for multiple captures.</p></li>

</ul>

</li>

<li id="GUID-A7ED7A90-1432-4905-A0A5-0CC725997127"><p>Use the display

of the device as a viewfinder by transferring image data from the camera to

the display memory.</p>

<ul>

<li><p>Start the transfer of viewfinder data with direct screen

access using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aStartViewFinderDirectL%28RWsSession%20%26amp%3b%2cCWsScreenDevice%20%26amp%3b%2cRWindowBase%20%26amp%3b%2cTRect%20%26amp%3b%29" format="application/java-archive"><codeph>CCamera::StartViewFinderDirectL()</codeph></xref> method.</p>

</li>

<li><p>Transfer viewfinder data as a bitmap using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aStartViewFinderBitmapsL%28TSize%20%26amp%3b%29" format="application/java-archive"><codeph>CCamera::StartViewFinderBitmapsL()</codeph></xref> method.

 <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html#%3a%3aMCameraObserver2%3a%3aViewFinderReady%28MCameraBuffer%20%26amp%3b%2cTInt%29" format="application/java-archive"><codeph>MCameraObserver2::ViewFinderReady</codeph></xref> is called

upon completion.</p></li>

<li><p>Set viewfinder mirroring on and flip the image horizontally

using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aSetViewFinderMirrorL%28TBool%29" format="application/java-archive"><codeph>CCamera::SetViewFinderMirrorL()</codeph></xref> method.</p>

</li>

<li><p>Stop the transfer of viewfinder data to the screen using

the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aStopViewFinder%28%29" format="application/java-archive"><codeph>CCamera::StopViewFinder()</codeph></xref> method.</p></li>

</ul>

</li>

<li id="GUID-136AEB7B-B618-456E-A7AA-27105A50B9DE"><p>Capture one

or multiple images using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aCaptureImage%28%29" format="application/java-archive"><codeph>CCamera::CaptureImage()</codeph></xref> method. <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html#%3a%3aMCameraObserver2%3a%3aImageBufferReady%28MCameraBuffer%20%26amp%3b%2cTInt%29" format="application/java-archive"><codeph>MCameraObserver2::ImageBufferReady()</codeph></xref> is called

upon completion.</p></li>

<li id="GUID-9EF06D1B-EB64-4406-A97F-FE0C9DA1664F"><p>To exit the

application or to switch it to the background, switch off the camera power

using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aPowerOff%28%29" format="application/java-archive"><codeph>CCamera::PowerOff()</codeph></xref> method and release the

camera for other applications using the <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html#%3a%3aCCamera%3a%3aRelease%28%29" format="application/java-archive"><codeph>CCamera::Release()</codeph></xref> method.</p></li>

<li id="GUID-DDC63446-DACC-434D-B6EE-E661C4FC2813"><p>The <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/CCameraClass.html" format="application/java-archive"><codeph>CCamera</codeph></xref> and <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Camera_Framework/MCameraObserver2Class.html" format="application/java-archive"><codeph>MCameraObserver2</codeph></xref> classes

are defined in the <codeph>ecam.h</codeph> header file. Add the following

line to the <codeph>.h</codeph> file, which is used to deploy the API:</p>

<codeblock id="GUID-BB25E774-4122-47AE-BDDD-6691BEAEB15E" xml:space="preserve">#include &lt;ecam.h&gt;</codeblock>

</li>

<li id="GUID-0053A8A8-8664-4E35-8D80-EA579503C463"><p>Make sure

you have correct <xref href="GUID-6971B0A2-F79B-4E05-8AF3-BB1FC1932A22.dita">capabilities</xref> information

set for your application. You need at least the <codeph>UserEnvironment</codeph> capability.</p>

</li>

<li id="GUID-CE8449BB-25A8-462A-8010-6B64F0120603"><p>Make sure <codeph>ecam.lib</codeph> is

accessible to your linker when compiling your application by including it

in your <codeph>mmp</codeph> file or by editing the project properties in

your IDE, depending on your build environment.</p></li>

</ol>

</section>

<section id="GUID-D10C038A-76EF-4E4A-9008-3FB1F5F487EA"><title>See also</title>

<p><xref href="GUID-DA26D246-D74A-529F-9F81-11B45669103F.dita">Capturing Image</xref></p>

<p><xref href="GUID-6C8507F7-FE70-5654-91B5-53E356CFF67C.dita">Controlling Pre-Image

Capture </xref></p>

<p><xref href="GUID-3C3BBE1F-D7A2-5021-830B-78084334C883.dita">Controlling Captured

Image</xref></p>

<p><xref href="GUID-BFDDCE4E-FE4F-5815-9D0B-A0967EA53B11.dita">Controlling Still-image

Capture</xref></p>

<p><xref href="GUID-36BD6059-6547-5754-8BE0-F8051A838C14.dita">Using Time Nudge

Capture Drive Mode </xref></p>

<p><xref href="GUID-E9E21C82-13F6-50D4-A271-F9E5F1BD982F.dita">Background Processing

for Ecam</xref></p>

</section>

</conbody></concept>