Simply update label in Qt - c++

Question

I have created a label with Qt Creator using a unique name, 'statusLabel'.
I then made a function to update this status label like so:
//Function to set the text in the status bar.
void AutoFish::updatelabel(QString str)
{
ui->statusLabel->setText(str);
}
This does not work and gives the following error:
C:\Qt\Tools\QtCreator\bin\AutoFish\autofish.cpp:24: error: C2227: left of '->statusLabel' must point to class/struct/union/generic type
I'm not sure what I'm doing wrong, I'm just trying to update the label text using that function. Should I be using something other than a label? I've been looking into slots to create an event to update the label, but most slot examples I find involve a pushButton as an event start, and that is not what I need.
Thank you.
EDIT: As per request, here is all of my source code(it's not very big): http://pastebin.com/CfQXdzBK

Answer 1

Because your method is declared as static, you can't acces non-static member ui directly.
Change
static void AutoFish::updatelabel(QString str);
to
void updatelabel(QString str);
in your header file.
There is no need for static keyword, because you want to set label for the specific instance of the window. Also, there is no need for AutoFish:: as you are declaring a method inside class declaration (however, you do need it in your cpp file).
As per the second error - inside your getWindow function, you need to have a instance of the AutoFish object in order to call updateLabel. So, either change your getWindow definition to:
HWND getWindow(AutoFish *af, LPCSTR processName)
{
HWND hwnd = FindWindowA(0, processName);
if(!hwnd) {
std::cout << "Error: Cannot find window!" << std::endl;
af->updatelabel("Error: Cannot find window.");
}
else {
std::cout << "Seccess! Window found!" << std::endl;
af->updatelabel("Seccess! Window Found!");
}
return hwnd;
}
and call it like this:
HWND window = getWindow(this, "FFXIVLauncher");
or make getWindow member of AutoFish class:
class AutoFish : public QMainWindow
{
// ...
HWND getWindow(LPCSTR processName);
// ...
};
HWND AutoFish::getWindow(LPCSTR processName) {
HWND hwnd = FindWindowA(0, processName);
if(!hwnd) {
std::cout << "Error: Cannot find window!" << std::endl;
updatelabel("Error: Cannot find window.");
}
else {
std::cout << "Seccess! Window found!" << std::endl;
updatelabel("Seccess! Window Found!");
}
return hwnd;
}
and this pointer will be implicitely passed to the getWindow.