[Gino+89+]

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#include <windows.h>


#define DIM_MAX 30

#define IDC_MAIN_STATIC 101
#define IDC_MAIN_BUTTON1 102
#define IDC_MAIN_BUTTON2 103
#define IDC_MAIN_BUTTON3 104
#define IDC_MAIN_BUTTON4 105
#define IDC_MAIN_BUTTON5 106
#define IDC_MAIN_BUTTON6 107
#define IDC_MAIN_BUTTON7 108
#define IDC_MAIN_BUTTON8 109

typedef struct{
        char numeroDiVolo[5];      /*chiave primaria*/
        char compagnia[20];
        double orarioDiPartenza;
        double orarioDiArrivo;
        int numPosti;
        int numPostiPrenotati;
        char destinazione[30];
}dati;

const char g_szClassName[]="WndClassPrincipale";
const char g_szControlStatic[]="STATIC";
const char g_szControlButton1[]="BUTTON";
const char g_szControlButton2[]="BUTTON";
const char g_szControlButton3[]="BUTTON";
const char g_szControlButton4[]="BUTTON";
const char g_szControlButton5[]="BUTTON";
const char g_szControlButton6[]="BUTTON";
const char g_szControlButton7[]="BUTTON";
const char g_szControlButton8[]="BUTTON";

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);

int WINAPI 
WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
dati array[DIM_MAX];
int numVoli=0,i;
WNDCLASSEX wc;
HWND hwnd,hWndStatic,hWndButton1,hWndButton2,hWndButton3,
     hWndButton4,hWndButton5,hWndButton6,hWndButton7,hWndButton8;
MSG msg;     
           
           for(i=0;i<DIM_MAX;i++)
                 array[i].numPostiPrenotati=0;
           
           /*Registrazione della Window Class*/
           wc.cbSize        = sizeof(wc);
           wc.style         = CS_HREDRAW | CS_VREDRAW;
           wc.lpfnWndProc   = WndProc;
           wc.cbClsExtra    = 0;
           wc.cbWndExtra    = 0;
           wc.hInstance     = hInstance;
           wc.hIcon         = NULL;
           wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
           wc.hbrBackground =(HBRUSH)(COLOR_WINDOW+11);
           wc.lpszMenuName  = NULL;
           wc.lpszClassName = g_szClassName;
           wc.hIconSm       = NULL;
           
           if(!RegisterClassEx(&wc))
           {
                 MessageBox(NULL, "Registrazione della Finestra Fallita!", "Errore!",
                                   MB_ICONEXCLAMATION | MB_OK);
           return 0;
           }
           
           hwnd=CreateWindow(g_szClassName,"Es2 Compito vacanze info Peliz", WS_OVERLAPPEDWINDOW,
                             CW_USEDEFAULT, 0, 300, 440,
                             NULL, NULL, hInstance, NULL);
           
           hWndStatic=CreateWindow(g_szControlStatic,"Compiti Vacanze Info Esercizio Num.2\n---Cappelli Gino---\nCreato con le Windows API", 
                                   WS_CHILD | WS_VISIBLE | SS_CENTER | SS_SUNKEN,
                                   20, 350, 250, 50,
                                   hwnd,(HMENU)IDC_MAIN_STATIC,hInstance, NULL);
           hWndButton1=CreateWindow(g_szControlButton1,"Nuovo numero di volo", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 20, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON1,hInstance, NULL);
           hWndButton2=CreateWindow(g_szControlButton2,"Cambio orario di partenza", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 60, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON2,hInstance, NULL);
           hWndButton3=CreateWindow(g_szControlButton3,"Prenotazione di 1 o + posti", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 100, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON3,hInstance, NULL);
           hWndButton4=CreateWindow(g_szControlButton4,"Cancellazione di 1 o + posti", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 140, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON4,hInstance, NULL);
           hWndButton5=CreateWindow(g_szControlButton5,"Ricerca info su 1 volo", 
                                  WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 180, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON5,hInstance, NULL);
           hWndButton6=CreateWindow(g_szControlButton6,"Stampa num. voli posti finiti", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 220, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON6,hInstance, NULL);
           hWndButton7=CreateWindow(g_szControlButton7,"Stampa voli x h.part.crescente", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 260, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON7,hInstance, NULL);
           hWndButton8=CreateWindow(g_szControlButton8,"Ricerca voli x 1 data destinaz.", 
                                   WS_CHILD | WS_VISIBLE | BS_NOTIFY | BS_PUSHBUTTON,
                                   40, 300, 200, 30,
                                   hwnd,(HMENU)IDC_MAIN_BUTTON8,hInstance, NULL);
           
           ShowWindow(hwnd,nCmdShow);
           UpdateWindow(hwnd);
     
           while(GetMessage(&msg, NULL, 0, 0) > 0)
           {
               TranslateMessage(&msg);
               DispatchMessage(&msg);
           }

return msg.wParam;         
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
        switch(msg)
        {
           case WM_CLOSE:
                PostQuitMessage(0);
                return 0;
                break;
           
           case BN_CLICKED:
           {
              case IDC_MAIN_BUTTON1:
                   MessageBox(hwnd, "Hello, World!", "Messaggio al mondo", MB_OK);
                   break;                     
           }
           break;
        }
 
return DefWindowProc(hwnd,msg,wParam,lParam);       
}

Ci sono delle strutture e variabili inizializzate inutilmente ma lasciate stare in quanto devi essere finito...

...nella WndProc non mi invia il MessageBox con Hello world in risposta al mio click sul primo bottone...perchè??...