*widgets.QPushButton not working for ConnectClicked(func(_ bool) { }

[sndnvaps]

dev platform:

 win7 x64
 qt 5.12.3 x86
 go 1.11.6 x86
 gocv version: 0.19.0
 opencv lib version: 4.0.1

my code is as below
mainform.ui is in videoCapture.zip

//mainform.go
package main

import (
	//"errors"
	"fmt"
	"github.com/satori/go.uuid"
	"github.com/therecipe/qt/core"
	"github.com/therecipe/qt/gui"
	"github.com/therecipe/qt/uitools"
	"github.com/therecipe/qt/widgets"
	"gocv.io/x/gocv"
	"os"
	//"strconv"
	//"time"
	//"unsafe"
)

var (
	webcam *gocv.VideoCapture
	window  *gocv.Window
)
type MainForm struct {
	core.QObject

	widget *widgets.QWidget
	PicBox *widgets.QLabel
	btn1   *widgets.QPushButton
	btn2   *widgets.QPushButton
	btn3   *widgets.QPushButton

	img    gocv.Mat


	m_timer *core.QTimer


	_ func() `constructor:"init"`
	_ func() `slot:"NextFrame,<-(this.m_timer.timeout)"`
	_ func() `slot:"Start"`
	_ func() `slot:"Stop"`
	_ func() `slot:TakePicture"`
}

func (w *MainForm) init() {

	w.m_timer = core.NewQTimer(nil)

	var loader = uitools.NewQUiLoader(nil)
	var file = core.NewQFile2("mainwindow.ui")

	file.Open(core.QIODevice__ReadOnly)
	w.widget = widgets.NewQWidgetFromPointer(loader.Load(file, nil).Pointer())
	file.Close()

	w.PicBox = widgets.NewQLabelFromPointer(w.FindChild("PicBox", core.Qt__FindChildrenRecursively).Pointer())
	w.btn1 = widgets.NewQPushButtonFromPointer(w.FindChild("startBtn", core.Qt__FindChildrenRecursively).Pointer())
	w.btn2 = widgets.NewQPushButtonFromPointer(w.FindChild("stopBtn", core.Qt__FindChildrenRecursively).Pointer())
	w.btn3 = widgets.NewQPushButtonFromPointer(w.FindChild("takePicture", core.Qt__FindChildrenRecursively).Pointer())

	// open WebCam
	w.btn1.ConnectClicked(func(_ bool) {
		w.Start()
	})

	// Stop WebCam
	w.btn2.ConnectClicked(func(_ bool) {
		w.Stop()
	})

	// Take Picture
	w.btn3.ConnectClicked(func(_ bool) {
		w.TakePicture()
	})

	w.ConnectStart(w.start)
	w.ConnectStop(w.stop)
	w.ConnectNextFrame(w.nextFrame)
	w.ConnectTakePicture(w.takePicture)
}

func Mat2QImage(mat gocv.Mat) *gui.QImage {
	dest := gocv.NewMat()
	defer dest.Close()

	gocv.CvtColor(mat, &dest, gocv.ColorBGRToRGB)
	data := dest.ToBytes()
	qimg := gui.NewQImage5(string(data), dest.Cols(), dest.Rows(), gui.QImage__Format_RGB888)

	qimg = qimg.RgbSwapped()
	return qimg
}

func (w *MainForm) start() {

	webcam, _ = gocv.OpenVideoCapture(0)
	defer webcam.Close()

	w.m_timer.SetInterval(50)
	for {
		img := gocv.NewMat()
		defer img.Close()
		if ok := webcam.Read(&img); !ok {
			fmt.Printf("Device closed: 0\n")
			return
		}
		/*
		ImageBox := gui.NewQPixmap()
		qimg := Mat2QImage(w.img)
		ImageBox = ImageBox.FromImage(qimg, core.Qt__AutoColor)
		w.PicBox.Clear()
		w.PicBox.SetPixmap(ImageBox)
		*/
		w.m_timer.Start2()
        //w.NextFrame()
	}
}

func (w *MainForm) stop() {
	w.m_timer.Stop()
	w.PicBox.SetPixmap(gui.NewQPixmap())
	window.Close()
}

func (w *MainForm) nextFrame() {

	window = gocv.NewWindow("Capture Window")
	defer window.Close()

	img := gocv.NewMat()
	defer img.Close()
	if ok := webcam.Read(&img); !ok {
		fmt.Printf("Device closed: 0\n")
		return
	}
	/*
	ImageBox := gui.NewQPixmap()
	qimg := Mat2QImage(w.img)
	ImageBox = ImageBox.FromImage(qimg, core.Qt__AutoColor)
	w.PicBox.Clear()
	w.PicBox.SetPixmap(ImageBox)
    */
	window.IMShow(img)
}

func (w *MainForm) takePicture() {
	uuid := uuid.Must(uuid.NewV4())
	fName := uuid.String() + ".jpg"
	fmt.Printf("fName = %s\n", fName)

	f, _ := os.Create(fName)
	defer f.Close()

	img := gocv.NewMat()
	defer img.Close()
	if ok := webcam.Read(&img); !ok {
		fmt.Printf("Device closed: 0\n")
		return
	}
	fmt.Println("50ms timeout: in TakePicture!")
	buf, _ := gocv.IMEncode(".jpg", img)
	f.Write(buf)

}


func main() {
	app := widgets.NewQApplication(len(os.Args), os.Args)
	window := NewMainForm(nil)
	window.widget.Show()
	app.Exec()
}

videoCapture.zip

[therecipe]

Hey

It should work with these changes:

 	var loader = uitools.NewQUiLoader(nil)
 	var file = core.NewQFile2("mainwindow.ui")
 
+	var widget = widgets.NewQWidget(nil, 0)
 	file.Open(core.QIODevice__ReadOnly)
-	w.widget = widgets.NewQWidgetFromPointer(loader.Load(file, nil).Pointer())
+	w.widget = widgets.NewQWidgetFromPointer(loader.Load(file, widget).Pointer())
 	file.Close()
 
-	w.PicBox = widgets.NewQLabelFromPointer(w.FindChild("PicBox", core.Qt__FindChildrenRecursively).Pointer())
-	w.btn1 = widgets.NewQPushButtonFromPointer(w.FindChild("startBtn", core.Qt__FindChildrenRecursively).Pointer())
-	w.btn2 = widgets.NewQPushButtonFromPointer(w.FindChild("stopBtn", core.Qt__FindChildrenRecursively).Pointer())
-	w.btn3 = widgets.NewQPushButtonFromPointer(w.FindChild("takePicture", core.Qt__FindChildrenRecursively).Pointer())
+	w.PicBox = widgets.NewQLabelFromPointer(widget.FindChild("PicBox", core.Qt__FindChildrenRecursively).Pointer())
+	w.btn1 = widgets.NewQPushButtonFromPointer(widget.FindChild("startBtn", core.Qt__FindChildrenRecursively).Pointer())
+	w.btn2 = widgets.NewQPushButtonFromPointer(widget.FindChild("stopBtn", core.Qt__FindChildrenRecursively).Pointer())
+	w.btn3 = widgets.NewQPushButtonFromPointer(widget.FindChild("takePicture", core.Qt__FindChildrenRecursively).Pointer())
 
 	// open WebCam
 	w.btn1.ConnectClicked(func(_ bool) {

It seems like you need to provide a parent when calling loader.Load, and then use that parent to find the children.

[sndnvaps]

@therecipe thanks, code is working now .
but, need more fix

[therecipe]

@sndnvaps I recently added support for the uic with 01e05b1

Maybe checkout the difference between these examples https://github.com/therecipe/qt/tree/master/internal/examples/uitools/calculator
and
https://github.com/therecipe/qt/tree/master/internal/examples/uitools/calculator_manual

for this to work you will only need to update the binding and then ut your *.ui files inside a folder called ui, then the binding (qtrcc/qtdeploy) should generate all the widget.FindChild( functions for you automatically.