Undefined Reference to a private HINSTANCE in the Header
Header
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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <windows.h>
class MainWindow
{
public:
MainWindow(HINSTANCE hInstance);
virtual ~MainWindow();
static LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam); //Creates LRESULT CALLBACK That Calls Parameters if Run is true
bool Run(int nCmdShow);
private:
WNDCLASSEX m_wndclass;
HWND m_hwnd;
static HINSTANCE m_hInstance;
static char m_szClassName[];
};
#endif // MAINWINDOW_H
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.CPP
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MainWindow::MainWindow(HINSTANCE hInstance)
{
m_hInstance = hInstance; // THIS IS WHERE ERROR IS//
m_wndclass.cbClsExtra = 0;
m_wndclass.cbSize = sizeof(WNDCLASSEX);
m_wndclass.cbWndExtra = 0;
m_wndclass.hbrBackground = (HBRUSH) (COLOR_WINDOW);
m_wndclass.hCursor = LoadCursor(NULL, IDC_CROSS);
m_wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
m_wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
m_wndclass.hInstance = hInstance;
m_wndclass.lpfnWndProc = MainWndProc;
m_wndclass.lpszClassName = m_szClassName;
m_wndclass.style = CS_DBLCLKS;
m_wndclass.lpszMenuName = NULL;
}
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I really am not understanding where my error is....Im just trying to create a simple window. This just started today
Did you initialize m_hInstance in the cpp file?
HINSTANCE MainWindow::m_hInstance = NULL;
Yes. Making m_hInstance non static seemed to solve the problem but i dont really understand why...
Use this:
MainWindow::m_hInstance = hInstance; // THIS IS WHERE ERROR IS//
Static members does not have hidden 'this' pointer applied automatically.
Thats what i thought modoran. Tried it, didnt work, and i need that particular HINSTANCE to be static now so i cant make it nonstatic
You have to initialize the static variable outside the class definition. Did you add that line of code to the top of the cpp file? e.g.
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#include "MainWindow.h"
HINSTANCE MainWindow::m_hInstance = NULL;
MainWindow::MainWindow(HINSTANCE hInstance)
{
m_hInstance = hInstance; // should work
...
}
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