get windows preview image for a file

ODБOï

Hello,

I want to make GCode preview feature in my QtQuick application.

i installed a softwere called thumbnailcnc, now in my Pc when i go to the folder where my GCode files are stored, i see a preview of files instead of white rectangles (as files are usually represented in windows)

My question is : Can my qt application get that preview as an image ?

thank you

mrjj

Hi
I have not seen any Qt way, however, you can use native API to do it
https://code.msdn.microsoft.com/windowsapps/File-thumbnails-sample-17575959
there is c++ sample.

update:
you could also maybe cheat a bit and use
https://thumbcacheviewer.github.io/
as it has a cmd line version so maybe you could run
it on a folder (using QProcess) and export the images to files.
Not tested if possible. was just a thought.

ODБOï

@mrjj thank you very much I will dig these 2 potential solutions.

my final goal is to click on a file and see its preview in my quick app, so more natual solution is to integrate a gcode viewer in my app instead of using the os things but i could not find any gcode parser/viewer that i m able to integrate. do you know one ?

JonB

@LeLev
So for what is available would Googling gcode viewer source code and looking at some of those hopefully give you some C++ source you can use? https://github.com/jtronics/G-Code-jViewer actually says it's QT-based, I'm hoping it's really Qt-based :)

ODБOï

@JonB thank you
i tryed 4 or 5 things and shamefully failed to integrate with my project as i said... I heve one Gcode to segment js library and im planning to use it with qml canvas 2d to draw the path.

I just wanted to see if someone knows a ready to use solution, who knows with Qt..! i already had nice surprises with @SGaist suggesting qvncclient or the arrival of qtopcua..

ODБOï

@JonB said in get windows preview image for a file:

some C++ source

it is a standalone software, no sources unfortunately

ODБOï

hi,i found this project. It works wery well. The only problem is i cant figure out how to use just a little part of it (open file and generate a preview) in my app,

Could you please give a hint on how to integrate it with my qt quick project ?

https://github.com/zapmaker/GrblHoming.git

i would like to create mu QQuickPaintedItem that shows the preview
thank you

ODБOï

i try to link the GrblHoming project to mine, only by

INCLUDEPATH += c:/users/lev/documents/dev/GrblHoming

there is a RenderArea class in GrblHoming project, im trying to create my own render area with QQuickPaintedItem base class

#ifndef GCODEVIEW_H
#define GCODEVIEW_H
#include <QtQuick/QQuickPaintedItem>
#include "renderarea.h"
#include "positem.h"
#include "renderitemlist.h"

class GCodeView : public QQuickPaintedItem
{
public:
    GCodeView(QQuickItem *parent = 0);

public slots:
    void setItems(QList<PosItem>);
    void setLivePoint(double x, double y, bool isMM, bool isLiveCP);
    void setVisualLivenessCurrPos(bool isLiveCP);
    void setVisCurrLine(int currLine);

protected:
    void paintEvent(QPaintEvent *event);

private:
    QList<PosItem> items;
    RenderItemList listToRender;
    QPen penProposedPath, penAxes, penCoveredPath, penCurrPosActive, penCurrPosInactive, penMeasure;
    PosItem livePoint;
    bool isLiveCurrPos;
};

#endif // GCODEVIEW_H

//.cpp

#include "gcodeview.h"
#include <QPainter>
GCodeView::GCodeView(QQuickItem *parent): QQuickPaintedItem(parent)
{}

void GCodeView::setItems(QList<PosItem> itemsRcvd)
{
    items = itemsRcvd;

    listToRender.setCurrFileLine(0);
    listToRender.convertList(items);
    listToRender.updateLivePoint();
    update();
}

void GCodeView::setLivePoint(double x, double y, bool mm, bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
    livePoint.setCoords(x, y, mm);
    listToRender.setLivePoint(livePoint);
    update();

}

void GCodeView::setVisualLivenessCurrPos(bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
}

void GCodeView::setVisCurrLine(int currLine)
{
    if (listToRender.setCurrFileLine(currLine))
        update();
}

void GCodeView::paintEvent(QPaintEvent * /* event */)
{
    if (!items.size())
        return;

    QSize size(this->size().height(),this->size().width());

    listToRender.rescale(size);

    QPainter painter;

    painter.setPen(penProposedPath);
    listToRender.writePath(painter, false);

    painter.setPen(penAxes);
    listToRender.drawAxes(painter);

    painter.setPen(penMeasure);
    listToRender.drawMeasurements(painter);

    painter.setPen(penCoveredPath);
    listToRender.writePath(painter, true);

    //if (!livePoint.isNull()) FIX isNull
    {
        if (isLiveCurrPos)
            painter.setPen(penCurrPosActive);
        else
            painter.setPen(penCurrPosInactive);
        listToRender.drawPoint(painter, livePoint);
    }
}

but this causes compil errors even if i don't use this class yet

gcodeview.obj:-1: erreur : LNK2019: symbole unresolved  "public: __cdecl RenderItemList::RenderItemList(void)" (??0RenderItemList@@QEAA@XZ) référencé dans la fonction "public: __cdecl GCodeView::GCodeView(class QQuickItem *)" (??0GCodeView@@QEAA@PEAVQQuickItem@@@Z)

gcodeview.obj:-1: erreur : LNK2019: symbole externe non résolu "public: virtual __cdecl RenderItemList::~RenderItemList(void)" (??1RenderItemList@@UEAA@XZ) référencé dans la fonction "int `public: __cdecl GCodeView::GCodeView(class QQuickItem *)'::`1'::dtor$2" (?dtor$2@?0???0GCodeView@@QEAA@PEAVQQuickItem@@@Z@4HA)

gcodeview.obj:-1: erreur : LNK2019: symbole externe non résolu "public: void __cdecl RenderItemList::convertList(class QList<class PosItem> const &)" (?convertList@RenderItemList@@QEAAXAEBV?$QList@VPosItem@@@@@Z) référencé dans la fonction "public: void __cdecl GCodeView::setItems(class QList<class PosItem>)" (?setItems@GCodeView@@QEAAXV?$QList@VPosItem@@@@@Z)

mrjj

Hi
Did you also take renderitemlist.cpp and added to your project ?
Just seems like normal linker errors as it sees the stuff in .h but finds no
body/implementation fo rit.

ODБOï

@mrjj no my bad

ODБOï

@mrjj i have no more linkage errors, but i cant use qmlRegisterType() to expose my class to qml

qmlRegisterType<GCodeView>("GC", 1 ,0 , "gcode");

i have erros saying C:\Qt\5.13.0\msvc2017_64\include\QtQml\qqmlprivate.h:124: error: C2259: 'QQmlPrivate::QQmlElement<T>'ÿ: impossible to create an object from abstract class
with
[
T=GCodeView
]

this i smy class

#ifndef GCODEVIEW_H
#define GCODEVIEW_H
#include <QtQuick/QQuickPaintedItem>
//#include "renderarea.h"
#include "positem.h"
#include "renderitemlist.h"





class GCodeView : public QQuickPaintedItem
{
public:
    GCodeView(QQuickItem *parent = 0);

public slots:
    void setItems(QList<PosItem>);
    void setLivePoint(double x, double y, bool isMM, bool isLiveCP);
    void setVisualLivenessCurrPos(bool isLiveCP);
    void setVisCurrLine(int currLine);


protected:
    void paint();

private:
    QList<PosItem> items;
    RenderItemList listToRender;
    QPen penProposedPath, penAxes, penCoveredPath, penCurrPosActive, penCurrPosInactive, penMeasure;
    PosItem livePoint;
    bool isLiveCurrPos;
};

#endif // GCODEVIEW_H
//-------------------------------------------------CPP----------------------------------------
#include "gcodeview.h"
#include <QPainter>
GCodeView::GCodeView(QQuickItem *parent): QQuickPaintedItem(parent)
{

}


void GCodeView::setItems(QList<PosItem> itemsRcvd)
{
    items = itemsRcvd;

    listToRender.setCurrFileLine(0);
    listToRender.convertList(items);
    listToRender.updateLivePoint();
    update();
}


void GCodeView::setLivePoint(double x, double y, bool mm, bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
    livePoint.setCoords(x, y, mm);
    listToRender.setLivePoint(livePoint);
    update();

}

void GCodeView::setVisualLivenessCurrPos(bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
}

void GCodeView::setVisCurrLine(int currLine)
{
    if (listToRender.setCurrFileLine(currLine))
        update();
}

void GCodeView::paint(/*QPaintEvent */ /* event */)
{
    if (!items.size())
        return;

    QSize size(this->size().height(),this->size().width());

    listToRender.rescale(size);

    QPainter painter;

    painter.setPen(penProposedPath);
    listToRender.writePath(painter, false);

    painter.setPen(penAxes);
    listToRender.drawAxes(painter);

    painter.setPen(penMeasure);
    listToRender.drawMeasurements(painter);

    painter.setPen(penCoveredPath);
    listToRender.writePath(painter, true);

    //if (!livePoint.isNull()) FIX isNull
    {
        if (isLiveCurrPos)
            painter.setPen(penCurrPosActive);
        else
            painter.setPen(penCurrPosInactive);
        listToRender.drawPoint(painter, livePoint);
    }
}

jsulm

@LeLev said in get windows preview image for a file:

QQuickPaintedItem

Override paint() method correctly. It is pure virtual in QQuickPaintedItem and you overloaded it instead of overriding it (it has aparameter: https://doc.qt.io/qt-5/qquickpainteditem.html#paint).

ODБOï

nice! now my class works nicely ! thank you @mrjj @JonB @jsulm !

edit : im able to display my GCodeView in qml with some test data like :

     list.append(PosItem(1,5,4,5));
    list.append(PosItem(2,8,1,2));
    list.append(PosItem(4,10,1,0));
    list.append(PosItem(22,11,5,1));

Now i need to parse a file instead of this test data. sadly i have to make a new post for this because i have an issue in my parse method

#ifndef GCODEVIEW_H
#define GCODEVIEW_H
#include <QtQuick/QQuickPaintedItem>
//#include "renderarea.h"
#include "positem.h"
#include "renderitemlist.h"

class GCodeView : public QQuickPaintedItem
{
public:
    GCodeView(QQuickItem *parent = 0);

public slots:
    void setItems(QList<PosItem>);
    void setLivePoint(double x, double y, bool isMM, bool isLiveCP);
    void setVisualLivenessCurrPos(bool isLiveCP);
    void setVisCurrLine(int currLine);


protected:
    void paint( QPainter *painterp);

private:
    QList<PosItem> items;
    RenderItemList listToRender;
    QPen penProposedPath, penAxes, penCoveredPath, penCurrPosActive, penCurrPosInactive, penMeasure;
    PosItem livePoint;
    bool isLiveCurrPos;
};

#endif // GCODEVIEW_H
//-----------------------------------------------CPP---------------------------------------------
#include "gcodeview.h"
#include <QPainter>
GCodeView::GCodeView(QQuickItem *parent): QQuickPaintedItem(parent)
{
    QList<PosItem> list;

   // some simulation data
    list.append(PosItem(1,5,4,5));
    list.append(PosItem(2,8,1,2));
    list.append(PosItem(4,10,1,0));
    list.append(PosItem(22,11,5,1));
    list.append(PosItem(1,5,4,5));
    list.append(PosItem(2,8,1,2));
    list.append(PosItem(4,10,1,0));
    list.append(PosItem(22,11,5,1));
    list.append(PosItem(1,5,4,5));
    list.append(PosItem(2,8,1,2));
    list.append(PosItem(4,10,1,0));
    list.append(PosItem(22,11,5,1));

     setItems(list);
}


void GCodeView::setItems(QList<PosItem> itemsRcvd)
{
    items = itemsRcvd;

    listToRender.setCurrFileLine(0);
    listToRender.convertList(items);
    listToRender.updateLivePoint();
    update();
}


void GCodeView::setLivePoint(double x, double y, bool mm, bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
    livePoint.setCoords(x, y, mm);
    listToRender.setLivePoint(livePoint);
    update();
}

void GCodeView::setVisualLivenessCurrPos(bool isLiveCP)
{
    isLiveCurrPos = isLiveCP;
}

void GCodeView::setVisCurrLine(int currLine)
{
    if (listToRender.setCurrFileLine(currLine))
        update();
}

void GCodeView::paint(QPainter *painter)
{
    if (!items.size())
        return;

    QSize size(this->size().height(),this->size().width());

    listToRender.rescale(size);

    //QPainter painter;

    painter->setPen(penProposedPath);
    listToRender.writePath(*painter, false);

    painter->setPen(penAxes);
    listToRender.drawAxes(*painter);

    painter->setPen(penMeasure);
    listToRender.drawMeasurements(*painter);

    painter->setPen(penCoveredPath);
    listToRender.writePath(*painter, true);

    //if (!livePoint.isNull()) FIX isNull
    {
        if (isLiveCurrPos)
            painter->setPen(penCurrPosActive);
        else
            painter->setPen(penCurrPosInactive);
        listToRender.drawPoint(*painter, livePoint);
    }
}
//-----------------------------------------------------------------------------------
 qmlRegisterType<GCodeView>("GCodeView", 1 ,0 , "Gcode");
//---------------------------------------QML-----------------------------------------
import GCodeView 1.0
import "."



ApplicationWindow {
    id: rootmain
    visible: true

    Gcode{
        anchors.centerIn: parent
        height: 150
        width: 150
    }
}