I am creating a keyboard hook, wherein KeyboardProc is a static member of a class CWidget.
class CWidget
{
static LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam );
};
I want to call the non-static members of CWidget inside the CWidget::KeyboardProc.
What is the best way to do it?
KeyboardProc does not have any 32 bit DWORD where I can pass the 'this' pointer.
Given that you probably only want one keyboard hook installed at a time, just add a static pThis member to your class:
// Widget.h
class CWidget
{
static HHOOK m_hHook;
static CWidget *m_pThis;
public:
/* NOT static */
bool SetKeyboardHook()
{
m_pThis = this;
m_hHook = ::SetWindowsHookEx(WH_KEYBOARD, StaticKeyboardProc, /* etc */);
}
// Trampoline
static LRESULT CALLBACK StaticKeyboardProc(int code, WPARAM wParam, LPARAM lParam)
{
ASSERT(m_pThis != NULL);
m_pThis->KeyboardProc(code, wParam, lParam);
}
LRESULT KeyboardProc(int code, WPARAM wParam, LPARAM lParam);
/* etc. */
};
You need to define the static member:
// Widget.cpp
CWidget *CWidget::m_pThis = NULL;
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