[WinApi] Obsługa komunikatu, a raczej jej brak

/* Notes
Jednostka ogólna = 1cm
*/
#include <string>
#include <windows.h>
#include <windowsx.h>
#include <cstring>
#include <cstring>
#define prostokat 0
#define trojkat 1
#define romb 2
#define trapez 3
#define rownoleglobok 4

#define ID_hm2dp    1001
#define ID_hm3dp   1002
#define ID_hsave1p  1003
#define ID_hinfo1st 1004
#define ID_herri1st 1005
#define ID_hwymXtx  1006
#define ID_hwymYtx  1007
#define ID_htype1se 1008
#define ID_htype2se 1009
#define ID_hmtypese 10010
#define ID_hresp 10011
#define ID_hsend1p 10012
//
#define ID2_hsend1p 100121
//
using namespace std;
HWND hwnd; /* A 'HANDLE', hence the H, or a pointer to our window */
MSG Msg; /* A temporary location for all messages */


// Zmienne:
//HWND:
HWND hmram;

HWND hm2dp;
HWND hm3dp;
HWND hsave1p;
HWND hsend1p;
HWND hsend2p;
HWND hinfo1st;
HWND herri1st;
HWND hwymXtx;
HWND hwymYtx;
HWND hwymHtx;
HWND htype1se;
HWND htype2se;
HWND htype3se;
HWND htype4se;
HWND hmtypese;
HWND hresp;
HWND hany1st;
HWND hany2st;
HWND hany3st;
HWND hany4st;
HWND hany5st;
HWND hany6st;
//int i dword
int X;
int Y;
int Xpoz;
int Ypoz;
int scal;
int acstan;
int wynik;

int je1I;
int je2I;
int je3I;
int je4I;
//string char i podobne
LPSTR je1;
LPSTR je2;
LPSTR je3;
LPSTR je4;
LPSTR col1;
LPSTR col2;
LPSTR war1;
LPSTR war2;
string diag;
LPSTR diagL;
//HPEN i HBRUSH

//inne
HINSTANCE hNewInstance;
HFONT hNormalFont =( HFONT ) GetStockObject( DEFAULT_GUI_FONT );
/* This is where all the input to the window goes to */
void DestroyAllWindows()
{
    DestroyWindow( hsave1p );
    DestroyWindow( hsend1p );
    DestroyWindow( hsend2p );
    DestroyWindow( hinfo1st );
    DestroyWindow( herri1st );
    DestroyWindow( hwymXtx );
    DestroyWindow( hwymYtx );
    DestroyWindow( hwymHtx );
    DestroyWindow( htype1se );
    DestroyWindow( htype2se );
    DestroyWindow( htype3se );
    DestroyWindow( htype4se );
    DestroyWindow( hmtypese );
    DestroyWindow( hm2dp );
    DestroyWindow( hm3dp );
    DestroyWindow( hresp );
    DestroyWindow( hany1st );
    DestroyWindow( hany2st );
    DestroyWindow( hany3st );
    DestroyWindow( hany4st );
    DestroyWindow( hany5st );
    DestroyWindow( hany6st );
}
int ob_prost()
{
    int jall1;
    int jall2;
    int wyn;
    GetWindowText( hwymXtx, war1, GetWindowTextLength( hwymXtx ) );
    GetWindowText( hwymYtx, war2, GetWindowTextLength( hwymYtx ) );
    jall1 = atoi( war1 );
    jall2 = atoi( war2 );
    je1I = ComboBox_GetCurSel( htype1se );
    je2I = ComboBox_GetCurSel( htype2se );
    je3I = ComboBox_GetCurSel( htype3se );
    je4I = ComboBox_GetCurSel( htype4se );
    switch( je1I )
    {
    case 0:
        je1 = "mm";
        jall1 = jall1 / 10;
        break;
    case 1:
        je1 = "cm";
        jall1 = jall1;
        break;
    case 2:
        je1 = "dm";
        jall1 = jall1 * 10;
        break;
    case 3:
        je1 = "m";
        jall1 = jall1 * 100;
        break;
    case 4:
        je1 = "km";
        jall1 = jall1 * 1000;
        break;
    }
    switch( je2I )
    {
    case 0:
        je2 = "mm";
        jall2 = jall2 / 10;
        break;
    case 1:
        je2 = "cm";
        jall2 = jall2;
        break;
    case 2:
        je2 = "dm";
        jall2 = jall2 * 10;
        break;
    case 3:
        je2 = "m";
        jall2 = jall2 * 100;
        break;
    case 4:
        je2 = "km";
        jall2 = jall2 * 1000;
        break;
    }
    wyn = jall1 * jall2;
    switch( je3I )
    {
    case 0:
        je3 = "mm";
        wyn = wyn * 100;
        break;
    case 1:
        je3 = "cm";
        wyn = wyn;
        break;
    case 2:
        je3 = "dm";
        wyn = wyn / 100;
        break;
    case 3:
        je3 = "m";
        wyn = wyn / 1000;
        break;
    case 4:
        je3 = "km";
        wyn = wyn / 1000000;
        break;
    }
    return wyn;
}
LRESULT CALLBACK WndProc( HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam ) {
    switch( Message ) {
       
        /* Upon destruction, tell the main thread to stop */
    case WM_DESTROY: {
            PostQuitMessage( 0 );
            break;
        }
    case WM_COMMAND:
        {
            switch( wParam )
            {
            case ID_hm2dp:
                DestroyAllWindows();
                hmtypese = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                CBS_DROPDOWNLIST, 102, 52, 100, 200, hwnd,( HMENU ) ID_hmtypese, hNewInstance, NULL );
                hresp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Reset", WS_CHILD | WS_VISIBLE, 1, 1, 100, 50, hwnd,( HMENU ) ID_hresp, hNewInstance, NULL );
                hsend1p = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Rozpocznij", WS_CHILD | WS_VISIBLE, 102, 1, 100, 50, hwnd,( HMENU ) ID_hsend1p, hNewInstance, NULL );
                hany1st = CreateWindowEx( 0, "STATIC", "Wybierz figurę:", WS_CHILD | WS_VISIBLE | SS_LEFT, 1, 52, 100, 25, hwnd, NULL, hNewInstance, NULL );
                SetWindowText( hany1st, "Wybierz figurę" );
                SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "prostokąt" );
                SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "trójkąt" );
                SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "romb" );
                SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "trapez" );
                SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "równoległobok" );
                break;
            case ID_hm3dp:
                DestroyAllWindows();
                break;
            case ID_hsend1p:
                {
                    acstan = ComboBox_GetCurSel( hmtypese );
                    if( acstan == CB_ERR )
                    {
                        break;
                    }
                    DestroyAllWindows();
                    switch( acstan )
                    {
                    case prostokat:
                        {
                            hsend1p = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Oblicz", WS_CHILD | WS_VISIBLE, 1, 1, 100, 50, hwnd,( HMENU ) ID2_hsend1p, hNewInstance, NULL );
                            hresp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Reset", WS_CHILD | WS_VISIBLE, 1, 51, 100, 25, hwnd,( HMENU ) ID_hresp, hNewInstance, NULL );
                            herri1st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "Oczekiwanie na dane...", WS_CHILD | WS_VISIBLE | SS_LEFT, 102, 1, 380, 50, hwnd, NULL, hNewInstance, NULL );
                            hany1st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "bok A", WS_CHILD | WS_VISIBLE | SS_LEFT, 1, 75, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hany2st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "bok B", WS_CHILD | WS_VISIBLE | SS_LEFT, 1, 100, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hany3st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "jednostka", WS_CHILD | WS_VISIBLE | SS_LEFT, 101, 51, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hany4st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "wartość", WS_CHILD | WS_VISIBLE | SS_LEFT, 201, 51, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            htype1se = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                            CBS_DROPDOWNLIST, 101, 76, 100, 200, hwnd, NULL, hNewInstance, NULL );
                            htype2se = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                            CBS_DROPDOWNLIST, 101, 101, 100, 200, hwnd, NULL, hNewInstance, NULL );
                            hwymXtx = CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER,
                            201, 76, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hwymYtx = CreateWindowEx( WS_EX_CLIENTEDGE, "EDIT", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER,
                            201, 101, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hany5st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "wynik w", WS_CHILD | WS_VISIBLE | SS_LEFT, 1, 126, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            hany6st = CreateWindowEx( WS_EX_CLIENTEDGE, "STATIC", "kolor", WS_CHILD | WS_VISIBLE | SS_LEFT, 301, 51, 100, 25, hwnd, NULL, hNewInstance, NULL );
                            htype3se = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                            CBS_DROPDOWNLIST, 301, 76, 100, 200, hwnd, NULL, hNewInstance, NULL );
                            htype4se = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                            CBS_DROPDOWNLIST, 301, 101, 100, 200, hwnd, NULL, hNewInstance, NULL );
                            hmtypese = CreateWindowEx( WS_EX_CLIENTEDGE, "COMBOBOX", NULL, WS_CHILD | WS_VISIBLE | WS_BORDER |
                            CBS_DROPDOWNLIST, 101, 126, 100, 200, hwnd, NULL, hNewInstance, NULL );
                           
                            SendMessage( htype1se, CB_ADDSTRING, 0,( LPARAM ) "mm" );
                            SendMessage( htype1se, CB_ADDSTRING, 0,( LPARAM ) "cm" );
                            SendMessage( htype1se, CB_ADDSTRING, 0,( LPARAM ) "dm" );
                            SendMessage( htype1se, CB_ADDSTRING, 0,( LPARAM ) "m" );
                            SendMessage( htype1se, CB_ADDSTRING, 0,( LPARAM ) "km" );
                           
                            SendMessage( htype2se, CB_ADDSTRING, 0,( LPARAM ) "mm" );
                            SendMessage( htype2se, CB_ADDSTRING, 0,( LPARAM ) "cm" );
                            SendMessage( htype2se, CB_ADDSTRING, 0,( LPARAM ) "dm" );
                            SendMessage( htype2se, CB_ADDSTRING, 0,( LPARAM ) "m" );
                            SendMessage( htype2se, CB_ADDSTRING, 0,( LPARAM ) "km" );
                           
                            SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "mm2" );
                            SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "cm2" );
                            SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "dm2" );
                            SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "m2" );
                            SendMessage( hmtypese, CB_ADDSTRING, 0,( LPARAM ) "km2" );
                           
                            SendMessage( htype3se, CB_ADDSTRING, 0,( LPARAM ) "czarny" );
                            SendMessage( htype3se, CB_ADDSTRING, 0,( LPARAM ) "niebieski" );
                            SendMessage( htype3se, CB_ADDSTRING, 0,( LPARAM ) "czerwony" );
                            SendMessage( htype3se, CB_ADDSTRING, 0,( LPARAM ) "zielony" );
                           
                            SendMessage( htype4se, CB_ADDSTRING, 0,( LPARAM ) "czarny" );
                            SendMessage( htype4se, CB_ADDSTRING, 0,( LPARAM ) "niebieski" );
                            SendMessage( htype4se, CB_ADDSTRING, 0,( LPARAM ) "czerwony" );
                            SendMessage( htype4se, CB_ADDSTRING, 0,( LPARAM ) "zielony" );
                            break;
                        }
                    }
                    break;
                }
            case ID2_hsend1p: // oto wadliwy komunikat
                {
                    SetWindowText( herri1st, "Rozpoczęto wstępne obliczanie" );
                    if( ComboBox_GetCurSel( htype1se ) == CB_ERR || ComboBox_GetCurSel( htype2se ) == CB_ERR )
                    {
                        SetWindowText( herri1st, "Błąd - brak któregoś argumentu" );
                        break;
                    }
                    if( ComboBox_GetCurSel( htype3se ) == CB_ERR || ComboBox_GetCurSel( htype4se ) == CB_ERR )
                    {
                        SetWindowText( herri1st, "Błąd - brak któregoś argumentu" );
                        break;
                    }
                    if( ComboBox_GetCurSel( hmtypese ) == CB_ERR )
                    {
                        SetWindowText( herri1st, "Błąd - brak któregoś argumentu" );
                        break;
                    }
                    SetWindowText( herri1st, "Rozpoczęto obliczanie" );
                    wynik = ob_prost();
                    itoa( wynik, diagL, 10 );
                    SetWindowText( herri1st, strcat( "a * b = ", diagL ) );
                    break;
                }
            case ID_hresp:
                {
                    DestroyAllWindows();
                    hm2dp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Figury 2d", WS_CHILD | WS_VISIBLE, 1, 1, 250, 250, hwnd,( HMENU ) ID_hm2dp, hNewInstance, NULL );
                    hm3dp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Figury 3d", WS_CHILD | WS_VISIBLE, 1, 252, 250, 250, hwnd,( HMENU ) ID_hm3dp, hNewInstance, NULL );
                    hmram = CreateWindowEx( 0, "BUTTON", "czekam na dane...", WS_CHILD | WS_VISIBLE | BS_GROUPBOX, 488, 1, 500, 500, hwnd,( HMENU ) ID_hm3dp, hNewInstance, NULL );
                }
                break;
            }
            break;
        }
       
        /* All other messages (a lot of them) are processed using default procedures */
        default:
        return DefWindowProc( hwnd, Message, wParam, lParam );
    }
    return 0;
}
/* The 'main' function of Win32 GUI programs: this is where execution starts */
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) {
    WNDCLASSEX wc; /* A properties struct of our window */
   
    /* zero out the struct and set the stuff we want to modify */
    memset( & wc, 0, sizeof( wc ) );
    wc.cbSize = sizeof( WNDCLASSEX );
    wc.lpfnWndProc = WndProc; /* This is where we will send messages to */
    wc.hInstance = hInstance;
    wc.hCursor = LoadCursor( NULL, IDC_ARROW );
   
    /* White, COLOR_WINDOW is just a #define for a system color, try Ctrl+Clicking it */
    wc.hbrBackground =( HBRUSH )( COLOR_WINDOW + 1 );
    wc.lpszClassName = "WindowClass";
    wc.hIcon = LoadIcon( NULL, IDI_APPLICATION ); /* Load a standard icon */
    wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION ); /* use the name "A" to use the project icon */
   
    if( !RegisterClassEx( & wc ) ) {
        MessageBox( NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK );
        return 0;
    }
   
    hwnd = CreateWindowEx( WS_EX_CLIENTEDGE, "WindowClass", "VaLC II", WS_VISIBLE | WS_SYSMENU,
    CW_USEDEFAULT, /* x */
    CW_USEDEFAULT, /* y */
    1000, /* width */
    600, /* height */
    NULL, NULL, hInstance, NULL );
   
    if( hwnd == NULL ) {
        MessageBox( NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK );
        return 0;
    }
    hm2dp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Figury 2d", WS_CHILD | WS_VISIBLE, 1, 1, 250, 250, hwnd,( HMENU ) ID_hm2dp, hInstance, NULL );
    hm3dp = CreateWindowEx( WS_EX_CLIENTEDGE, "BUTTON", "Figury 3d", WS_CHILD | WS_VISIBLE, 1, 252, 250, 250, hwnd,( HMENU ) ID_hm3dp, hInstance, NULL );
   
    hmram = CreateWindowEx( 0, "BUTTON", "czekam na dane...", WS_CHILD | WS_VISIBLE | BS_GROUPBOX, 488, 1, 500, 500, hwnd,( HMENU ) ID_hm3dp, hInstance, NULL );
   
   
    SendMessage( hm2dp, WM_SETFONT,( WPARAM ) hNormalFont, 0 );
    SendMessage( hm3dp, WM_SETFONT,( WPARAM ) hNormalFont, 0 );
    /*
    This is the heart of our program where all input is processed and
    sent to WndProc. Note that GetMessage blocks code flow until it receives something, so
    this loop will not produce unreasonably high CPU usage
    */
    hNewInstance = hInstance;
    while( GetMessage( & Msg, NULL, 0, 0 ) > 0 ) { /* If no error is received... */
        TranslateMessage( & Msg ); /* Translate key codes to chars if present */
        DispatchMessage( & Msg ); /* Send it to WndProc */
    }
    return Msg.wParam;
}