Call a slot in QWidget promoted class

[beowulf]

I'm in a class derived from QWidget, within that my class has a slot where asks for a parameter to be passed.
I put a widget in the GUI (Qt Designer) and took a Promote this class.
I tried to give a connect the pushbutton onclick to the slot QWidget (ShowImage(QImage)), but can not find the slot of class I gave Promote.

example:

@
connect(ui->pushButton, SIGNAL(clicked()), ui->widget, SLOT(ShowImage(QImage)));
@

Returns:

QObject::connect: Incompatible sender/receiver arguments
QPushButton::clicked() --> MyWidget::ShowImage(QImage)

When i try:

@
QImage img;

img.load("D:\\Desert.jpg");

connect(ui->pushButton, SIGNAL(clicked()), ui->widget, SLOT(ShowImage(img)));

@

Object::connect: No such slot MyWidget::ShowImage(img)
Object::connect: (sender name: 'pushButton')
Object::connect: (receiver name: 'widget')

[beemaster]

Signals and slots should have the same arguments. You can not do things like that.
You should connect a SLOT which has no arguments, like this:
@
connect(ui->pushButton, SIGNAL(clicked()), ui->widget, SLOT(ShowImage()));
@
and modify ShouwImage method
@
void Widget::ShowImage()
{
QImage img;
img.load("D:\Desert.jpg");
// Show Image
// ...
}
@

[beowulf]

Resolved!

I put ShowImage as a public method.