win32 waiting for events(synchroniztion) - winapi

Question

I have 3 windows that have to interact with each other using events.
windows 1 and 2 are identical; each only have one button in them.
Basically, I the main window(program 3) to not show up until one of the other two windows buttons
is clicked; this is how it was describes in the lab:
You need to use synchronization to control the processes (starting Program3 via Program1 or 2, ending Program1 or 2 via closing Program3). Note: Program1 and Program2 must have had their button clicked in order for them to receive the signal to die
I've been looking around and got this so far for code:
Main window(program 3):
#include <windows.h>
#include<string.h>
#include <stdio.h>
#include <tchar.h>
#include <conio.h>
#pragma comment(lib, "winmm.lib")
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("RACE") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
HANDLE hEvents[2];
hEvents[0] = "btn2";
hEvents[1] = "btn3";
DWORD count = 2;
HBRUSH brush;
brush = CreateSolidBrush(RGB(255,0,0));
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = brush;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
TCHAR* name;
//WAIT FOR SIGNAL
DWORD result = WaitForMultipleObjects(count,hEvents,FALSE,INFINITE);//work on this
if(result == WAIT_OBJECT_0)
{
name = TEXT("Program 1");
}
else if(result == WAIT_OBJECT_0 + 1)
{
name = TEXT("Program 2");
}
hwnd = CreateWindow (szAppName, // window class name
name, // window caption
WS_OVERLAPPEDWINDOW, // window style
0, // initial x position
0, // initial y position
600, // initial x size
600, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow (hwnd, iCmdShow) ;//DON'T SHOW UNTIL ANOTHER WINDOW'S BUTTON IS PUSHED.
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
TCHAR* carNames[5] = {TEXT("Red Car"), TEXT("Blue Car"), TEXT("Black Car"), TEXT("Green Car"), TEXT("Orange Car")};
switch (message)
{
case WM_CREATE:
HWND hwndButton;
for(int i = 0; i < 5; i++)
{
hwndButton = CreateWindow ( TEXT("button"),//type of child window
carNames[i],//text displayed on button
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,//type of button
20, (20*i*5+10),
85, 25,
hwnd, //parent handle i.e. main window handle
(HMENU) i,//child ID – any number
((LPCREATESTRUCT) lParam)->hInstance, NULL);
}
break;
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
return 0 ;
/* case WM_CLOSE:
c--;
DestroyWindow(hwnd);
return 0 ;*/
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
window 2(program2):
#include <windows.h>
#include<string.h>
#pragma comment(lib, "winmm.lib")
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Part 2") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("Part 2"), // window caption
WS_OVERLAPPEDWINDOW, // window style
0, // initial x position
0, // initial y position
300, // initial x size
200, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL) ; // creation parameters
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
HANDLE hEvent;
switch (message)
{
case WM_CREATE:
HWND hwndButton2;
hwndButton2 = CreateWindow ( TEXT("button"),//type of child window
TEXT("PRESS ME!"),//text displayed on button
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,//type of button
20, 20,
200, 25,
hwnd, //parent handle i.e. main window handle
(HMENU) 45,//child ID – any number
((LPCREATESTRUCT) lParam)->hInstance, NULL);
hEvent = CreateEvent(NULL, //no security attributes
FALSE, //auto-reset event object
FALSE, //initial state is nonsignaled
L"btn2"); //unnamed object
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_COMMAND:
SetEvent("btn2");
return 0;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
and window 3 (program 3): which is pretty much identical to window 2
#include <windows.h>
#include<string.h>
#pragma comment(lib, "winmm.lib")
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Part 3") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("Part 3"), // window caption
WS_OVERLAPPEDWINDOW, // window style
0, // initial x position
0, // initial y position
300, // initial x size
200, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL) ; // creation parameters
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
HANDLE hEvent1;
switch (message)
{
case WM_CREATE:
HWND hwndButton3;
hwndButton3 = CreateWindow ( TEXT("button"),//type of child window
TEXT("PRESS ME!"),//text displayed on button
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,//type of button
20, 20,
200, 25,
hwnd, //parent handle i.e. main window handle
(HMENU) 95,//child ID – any number
((LPCREATESTRUCT) lParam)->hInstance, NULL);
hEvent1 = CreateEvent(NULL, //no security attributes
FALSE, //auto-reset event object
FALSE, //initial state is nonsignaled
L"btn3"); //unnamed object
return 0 ;
case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_COMMAND:
SetEvent("btn3");
return 0;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
These are all in the same solution; but in different projects(multiple project in one solution).
The problem right now is that I can't seem to get the main window to open when I click
either one of the buttons. I've tried many different things, but none seem to be working.
Any and all help is appreciated. Thanks in advance.

Answer 1

HANDLE hEvents[2];
hEvents[0] = "btn2";
hEvents[1] = "btn3";
That's not right. You'll have to call the CreateEvent function just like you do in the other two programs.