qt load image from resource: No input files specified error

0
votes

please note: QT newbie

I am attempting to display a PNG on a qLabel using the setPixmap function.

note: PNG dimensions < Label dimensions

Following this example, it is supposed to display the image, but I have no luck.

I have attempted many examples, from using QImage to using GraphicsViews,etc.

I have gotten this image to show by specifying the full path in the QPixmap pixmap("full_path_here"), thus wanting to get rid of the full path, attempted adding this image to a resource fill, aka .qrc but the error below persists, I have no idea why.

ERROR: /opt/qt/Qt5.7.0/5.7/gcc_64/bin/rcc:-1: error: No input files specified.

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{


    ui->setupUi(this);
    QPixmap mypix (":/back.png");
    ui->label->setPixmap(mypix);

}

MainWindow::~MainWindow()
{
    delete ui;
}

.qrc resource file

<RCC>
    <qresource prefix="/">
        <file>back.png</file>
    </qresource>
</RCC>

mainwindow.ui

<widget class="QLabel" name="label">
    <property name="geometry">
     <rect>
      <x>90</x>
      <y>20</y>
      <width>131</width>
      <height>121</height>
     </rect>
    </property>
    <property name="text">
     <string/>
    </property>
   </widget>

Project Location:

ll /home/cx/qt-projects/VPN/

total 48
drwxrwxr-x 1 cx cx   162 Oct  5 15:53 ./
drwxr-xr-x 1 cx cx    90 Oct  5 12:21 ../
-rw-rw-r-- 1 cx cx  1514 Oct  5 15:33 back.png
drwxrwxr-x 1 cx cx   108 Oct  5 12:12 .git/
-rw-rw-r-- 1 cx cx   172 Oct  5 10:41 main.cpp
-rw-rw-r-- 1 cx cx   393 Oct  5 15:53 mainwindow.cpp
-rw-rw-r-- 1 cx cx   399 Oct  5 15:25 mainwindow.h
-rw-rw-r-- 1 cx cx  3134 Oct  5 12:21 mainwindow.ui
drwxrwxr-x 1 cx cx     8 Oct  5 12:11 res/
-rw-rw-r-- 1 cx cx   400 Oct  5 12:12 VPN.pro
-rw-rw-r-- 1 cx cx 24064 Oct  5 12:35 VPN.pro.user
2
c++qtqpixmapqlabel

2 Answers

0
votes

Try changing your qrc file to:

<!DOCTYPE RCC>
<RCC version="1.0">
<qresource>
<file>back.png</file>
</qresource>
</RCC>
0
votes

Your file path in .qrc file must be locatable on the filesystem by RCC compiler. E.g. for example if your file exists one directory up then you could just do following

<RCC>
    <qresource>
        <file>../back.png</file>
    </qresource>
</RCC>

In your example RCC compiler is looking for file in /back.png path and probably it doesn't exist there