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Object Oriented WinAPI
I have a problem with following code:
Everything is OK before that I want to use 'this' pointer from windowProcedure:
Code:
SetWindowText(o_hwnd, this->m_className);
Any idea? I don't understand why it doesn't work - CWindowClass is accesible, but nothing more?
Code:
#ifndef MAIN_H_INCLUDED
#define MAIN_H_INCLUDED
#define body /* BODY */
#define operands /* OPERANDS */
#define initialize /* INITIALIZE */
#define function /* FUNCTION */
#include <windows.h>
#include "error.h"
// class declaration CMainWindow
//_________________________________________________________________________________________________
typedef class CMainWindow{
private: const HINSTANCE mi_instance;
private: const int mi_cmdShow;
private: const char *m_className;
private: char *m_windowCaption;
private: WNDCLASSEX *m_windowClass;
private: MSG *m_messages;
private: HWND *m_hWindow;
private: void initializeWndClass(void);
private: void registerWndClass(void);
private: void createWnd(void);
private: static LRESULT __stdcall static_windowProcedure(HWND, UINT, WPARAM, LPARAM);
private: LRESULT __stdcall windowProcedure(HWND, UINT, WPARAM, LPARAM);
public: void Caption(char*);
public: void Run(void);
public: CMainWindow(const HINSTANCE, const int);
public: ~CMainWindow(void);
}* MainWindow;
//_________________________________________________________________________________________________
// ctor (HINSTANCE, HINSTANCE, LPSTR, int)
CMainWindow::CMainWindow
operands(
const HINSTANCE hThisInstance,
int nCmdShow
)
initialize:
mi_instance(hThisInstance),
mi_cmdShow(nCmdShow),
m_className("CMainWindowClass"),
m_windowCaption("ITHDTetris")
body{
// Initialize non-const members
this->m_windowClass = new WNDCLASSEX;
this->m_messages = new MSG;
this->m_hWindow = new HWND;
}
//_________________________________________________________________________________________________
// dtor (void)
CMainWindow::~CMainWindow operands(void) body{
delete m_className;
delete m_windowClass;
delete m_windowCaption;
delete m_messages;
delete m_hWindow;
}
//_________________________________________________________________________________________________
// Caption : void (const char*)
inline void
CMainWindow::Caption operands(char* o_caption){
m_windowCaption = o_caption;
}
//_________________________________________________________________________________________________
// Run : void (void)
void
CMainWindow::Run operands(void) body{
// Prepare window
this->initializeWndClass();
this->registerWndClass();
// Make the window visible on the screen
ShowWindow(*m_hWindow, mi_cmdShow);
// Run the message loop. It will run until GetMessage() returns 0
while(GetMessage (m_messages, NULL, 0, 0)){
// Translate virtual-key messages into character messages
TranslateMessage(m_messages);
// Send message to WindowProcedure
DispatchMessage(m_messages);
}
}
//_________________________________________________________________________________________________
// initializeWndClass : void (HINSTANCE) /* Fills WNDCLASSEX fields */
void
CMainWindow::initializeWndClass operands(void) body{
// The window structure
this->m_windowClass->hInstance = mi_instance;
this->m_windowClass->lpszClassName = m_className;
this->m_windowClass->lpfnWndProc = this->static_windowProcedure;
this->m_windowClass->style = CS_DBLCLKS;
this->m_windowClass->cbSize = sizeof(WNDCLASSEX);
// Use default icon and mouse pointer
this->m_windowClass->hIcon = LoadIcon (NULL, IDI_APPLICATION);
this->m_windowClass->hIconSm = LoadIcon (NULL, IDI_APPLICATION);
this->m_windowClass->hCursor = LoadCursor (NULL, IDC_ARROW);
this->m_windowClass->lpszMenuName = NULL; // No menu
this->m_windowClass->cbClsExtra = 0; // No extra bytes after the window class
this->m_windowClass->cbWndExtra = 0; // structure or the window instance
// Use Windows's default colour as the background of the window
this->m_windowClass->hbrBackground = (HBRUSH) COLOR_BACKGROUND;
}
//_________________________________________________________________________________________________
// registerWndClass : void (void)
void
CMainWindow::registerWndClass operands(void) body{
// Register the window class, and if it fails quit the program
if(!RegisterClassEx(m_windowClass)) throw Error("Class registring fail");
else this->createWnd();
}
//_________________________________________________________________________________________________
// createWnd : void (void)
void
CMainWindow::createWnd operands(void) body{
*this->m_hWindow = CreateWindowEx(
0, // Extended possibilites for variation
this->m_className, // Classname
this->m_windowCaption, // Title Text
WS_OVERLAPPEDWINDOW, // Default window
CW_USEDEFAULT, // Windows decides the position
CW_USEDEFAULT, // where the window ends up on the screen
544, // The programs width
375, // and height in pixels
HWND_DESKTOP, // The window is a child-window to desktop
NULL, // No menu
mi_instance, // Program Instance handler
this // This instance
);
}
//_________________________________________________________________________________________________
LRESULT __stdcall
CMainWindow::static_windowProcedure
operands(
HWND o_hWnd,
UINT o_message,
WPARAM o_wParam,
LPARAM o_lParam
)
body{
CMainWindow *lp_parrent = reinterpret_cast<CMainWindow*>(GetWindowLongPtr(o_hWnd, GWL_USERDATA));
if(!lp_parrent){
CREATESTRUCT *cs=(CREATESTRUCT*)o_lParam;
lp_parrent=(CMainWindow*)cs->lpCreateParams;
SetWindowLongPtr(o_hWnd, GWL_USERDATA, (LONG_PTR) lp_parrent);
return lp_parrent->windowProcedure(o_hWnd, o_message, o_wParam, o_lParam);
}
return lp_parrent->windowProcedure(o_hWnd, o_message, o_wParam, o_lParam);
}
//_________________________________________________________________________________________________
LRESULT __stdcall
CMainWindow::windowProcedure operands(
HWND o_hwnd,
UINT o_message,
WPARAM o_wParam,
LPARAM o_lParam
)
body{
switch (o_message){ // handle the messages
case WM_DESTROY:
PostQuitMessage (0); // send a WM_QUIT to the message queue
break;
case WM_LBUTTONDOWN:
case WM_LBUTTONDBLCLK:
SetWindowText(o_hwnd, this->m_className);
break;
case WM_LBUTTONUP:
SetWindowText(o_hwnd, "Push the left mouse button");
break;
default: // for messages that we don't deal with
return DefWindowProc (o_hwnd, o_message, o_wParam, o_lParam);
}
}
#endif // MAIN_H_INCLUDED
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After the call to CreateWindowEx() add
Code:
SetWindowLong( m_hWindow, GWL_USERDATA, (long)(void*)this);
and in the window procedure add
Code:
CMainWindow *This = (CMainWindow*)GetWindowLong (o_hWnd, GWL_USERDATA)
Use This-> to call any member functions. It looks like you have something close to this already.
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