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This article mainly introduces "how to use canon edsdk to achieve real-time preview in Qt". In daily operation, I believe many people have doubts about how to use canon edsdk to achieve real-time preview in Qt. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubt of "how to use canon edsdk to achieve real-time preview in Qt". Next, please follow the editor to study!

Real-time preview step StartLiveView

Declare a variable to mark m_isLiveView to identify whether liveview is turned on.

Output live preview to PC

Device | = kEdsEvfOutputDevice_PC

/ /-- void MainWindow::StartLiveView () {/ / Change settings because live view cannot be started / / when camera settings are set to "do not perform live view." / / Open EdsError err = EDS_ERR_OK; uint evfMode = 1; / / write 1 to enable err = EdsSetPropertyData (m_camera, kEdsPropID_Evf_Mode, 1, sizeof (uint), & evfMode) M_isLiveView = true; / / Get the output device for the live view image EdsUInt32 device; err = EdsGetPropertyData (m_camera, kEdsPropID_Evf_OutputDevice, 0, sizeof (device), & device); if (err = = EDS_ERR_OK) {device | = kEdsEvfOutputDevice_PC; err = EdsSetPropertyData (m_camera, kEdsPropID_Evf_OutputDevice, 0, sizeof (device), & device);}} convert the previewed image stream to QImage and then to Mat

QImage img = QImage::fromData (data, length, "JPG")

The most important thing is to convert the image stream to QImage format. I have searched the Internet for a long time. I don't know how to use data and length. Many of the images on the Internet are processed with vb and c #, and there is no C++.

/ /-- bool MainWindow::requestLiveViewImage () {EdsError error = EDS_ERR_OK; EdsStreamRef stream = NULL; EdsEvfImageRef evfImage = NULL; EdsUInt64 length; if (! m_isLiveView) {error = EDS_ERR_INTERNAL_ERROR; qDebug ()

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