Cum declar doua clase in care se pot apela membrii celeilalte

Cum declar doua clase in care se pot apela membrii celeilalte?

Deci am incercat in headere App.h

#ifndef _APP_H_
#define _APP_H_
class API;
class APP {
public:
APP() {
g.winw=600; g.winh=500;
}
~APP() {}
void Test();
API *pAPI;
};
#endif

in APIwin.h

#ifndef _APIWIN_H_
#define _APIWIN_H_
#include <windows.h>
#include "App.h"
class API {
HFONT hfont;
public:
API(APP &rAPP_): rAPP(rAPP_) {
test=69;
}
static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
HRESULT Create(HINSTANCE hInstance);
bool Close();
int test;
private:
HWND hWndMain, hWndChild;
HINSTANCE mHInstance;
APP &rAPP;
};
#endif

in surse App.cpp

#include "App.h"
#include "APIwin.h"
void APP::Test() {
char out[255];
sprintf(out, "APP::Test() %d", pAPI->test);
}

inAPIwin.cpp

#include "APIwin.h"
HRESULT API::Create(HINSTANCE hInstance) {
HWND hWnd; WNDCLASSEX wCs;
static const char* wndClassName = "WndClass";
wCs.cbSize	 = sizeof wCs;
wCs.style	 = CS_HREDRAW | CS_VREDRAW;
wCs.lpfnWndProc = WindowProc;
wCs.cbClsExtra = 0;
wCs.cbWndExtra = 0;
wCs.hInstance = hInstance;
wCs.hIcon	 = LoadIcon(hInstance, MAKEINTRESOURCE(ID_MYICON));
wCs.hCursor	 = LoadCursor(NULL, IDC_ARROW);
wCs.hbrBackground = NULL;
wCs.lpszMenuName = NULL;
wCs.lpszClassName = wndClassName;
wCs.hIconSm	 = LoadIcon(hInstance, MAKEINTRESOURCE(ID_MYICON));
if (RegisterClassEx(&wCs)) {
hWnd = CreateWindowEx(
	 WS_EX_CLIENTEDGE | WS_EX_ACCEPTFILES, // extended window style
	 wndClassName, // registered class name
	 TEXT("netMonitorPlugins"), // and window title
	 WS_OVERLAPPEDWINDOW, // window style
	 CW_USEDEFAULT, CW_USEDEFAULT, rAPP.g.winw, rAPP.g.winh,
	 NULL, NULL, hInstance, // handle to application instance
	 this	 // if need to take pointer
);
SetWindowLongPtr(hWnd, GWLP_USERDATA, (LPARAM)this);
}
if(hWnd==NULL) {
MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
return E_FAIL;
}
if (rAPP.g.winstate==3)
ShowWindow(hWnd, SW_MAXIMIZE);
else
ShowWindow(hWnd, SW_SHOWNORMAL);
UpdateWindow(hWnd);
mHInstance=hInstance;
hfont = CreateFont(15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, "Arial");
SendMessage(hWnd, WM_SETFONT, (WPARAM)hfont, TRUE);
ChangeWindowMessageFilter (WM_DROPFILES, MSGFLT_ADD);
ChangeWindowMessageFilter (WM_COPYDATA, MSGFLT_ADD);
ChangeWindowMessageFilter (0x0049, MSGFLT_ADD);
return S_OK;
}
LRESULT CALLBACK API::WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) {
if (msg == WM_CREATE) {
LPCREATESTRUCT lpcs = (LPCREATESTRUCT) lParam;
SetWindowLongPtr(hWnd, GWLP_USERDATA, (LPARAM) (lpcs->lpCreateParams));
}
API* pAPI = (API*) GetWindowLongPtr(hWnd, GWLP_USERDATA);
switch(msg) {
case WM_CREATE: {
	 pAPI->hWndMain=hWnd;
	 return 0;
}
case WM_CLOSE:
	 pAPI->Close();
break;
case WM_DESTROY:
	 KillTimer(hWnd, 0);
	 PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, msg, wParam, lParam);
}
return 0;
}
bool API::Close() {
char className[50];
GetClassName(hWndMain, className, sizeof(className));
DestroyWindow(hWndMain);
UnregisterClass(className, mHInstance);
return true;
}

si in final Main.cpp

#include <windows.h>
#include "APIwin.h"
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
int nAppResult = -1;
APP oAPP;
API oAPI(oAPP);
oAPP.Test();
if (SUCCEEDED(oAPI.Create(hInstance))) {
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)) {
if (msg.message == WM_KEYDOWN) {
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
nAppResult = msg.wParam;
}
return nAppResult;
}

Se deschide fereastra dar este o problema cu API *pAPI; probabil e vorba de o alta instanta pentru ca test=69; nu este egal cu cel din APP::Test()

Intre timp am gasit ce lipsea:

  API(APP &rAPP): oAPP(rAPP) {
	oAPP.pAPI = this;

Pentru ca pAPI sa fie pointer catre instanta din Main.cpp.

O alta intrebare: se poate face acelasi lucru fara pointerul pAPI? Deci in loc de pointer sa folosesc tot referinta API &rAPI; ?

Nu-mi dau seama de ce ai si APP si API. Poti si doar cu una.

Se vede ca nu ai facut aplicatii mai complexe, in niciun caz crossover. Dupa ce faci, o sa intelegi de ce.

Crossover ce ?
Vrei ca o aplicatie sa spioneze ce face alta aplicatie ?
Visual Studio 6 avea Spy++ cu tot cu codul sursa.

Edited by MarianG, 29 March 2023 - 08:48.