Thread: how to use same variable in different procedures?

For example in the Dialog Window Proc I assign some values to an integer variable. Than I need to use this variable in another Proc such as WndProc but it does not recognize the variable in WndProc, says it is not declared. Is there a way to somehow declare a public integer that will be seen in all procedures?

examaple:

Code:

BOOL CALLBACK PieDlgProc(HWND dlghwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{

int Pval1 = GetDlgItemInt(dlghwnd, txtVal1, 0, FALSE);

}

Sets a value for Pval1

Now I need to use this value in WM_PAIT,

Code:

case WM_PAINT:
		{
 AngleArc(ps.hdc, 400, 300, 150, 0, Pval1);

But I get error that Pval1 is not declared in WM_PAINT.

If you're going to make it file global, at least put it in an anonymous namespace

Code:

namespace
{
   int g_MayVariable;
}

It's considered "good practice" and avoids clashes with other globals that may have the same name. Also locks it to file scope.

If i make it global and declare at the top than dlghwnd becomes undeclared as it is the HWND of the dialog window.