[App] - WinAPI.Exemplo

#include <windows.h>
#include <tchar.h>
#include <iostream>
using namespace std;

const char g_szClassName[] = "handle1";
HWND Button1; /* HANDLE de nossos objetos */
HWND NewContact; // HANDLE do Window Contatc
HWND Nome, Numero, Add; // HANDLE do Window Contatc
#define intButton1   1002 /*IDs de nossos objetos*/
#define intEdit1   1003 /*IDs de nossos objetos*/
#define intEdit2   1004 /*IDs de nossos objetos*/
#define intAdd1   1005 /*IDs de nossos objetos*/
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_COMMAND:
        {
                if(LOWORD(wParam) == intButton1)
                {
                    //MessageBox(NULL, "Você acabou de clicar em um botão", "Informação!", MB_ICONINFORMATION | MB_OK);
                    ShowWindow(NewContact, SW_SHOW);
                    UpdateWindow(NewContact);
                    ShowWindow(Nome, SW_SHOW);
                    UpdateWindow(Nome);
                    ShowWindow(Numero, SW_SHOW);
                    UpdateWindow(Numero);
                    ShowWindow(Add, SW_SHOW);
                    UpdateWindow(Add);

                }

                if(LOWORD(wParam) == intAdd1)
                {
                    char GNome[128], GNumero[30];
                    GetWindowText(Nome, (LPWSTR)GNome, 128);
                    GetWindowText(Numero, (LPWSTR)GNumero, 30);
                    cout << "Você Adicionou um Novo Contato:" << endl;
                    cout << "Nome" << GNome << endl;
                    cout << "Numero" << GNumero << endl;
                    //DestroyWindow(NewContact);
                    //DestroyWindow(Nome);
                    //DestroyWindow(Numero);
                    //DestroyWindow(Add);
                }
                break;
        }
        case WM_CLOSE:
            DestroyWindow(hwnd);
        break;
        case WM_DESTROY:
            PostQuitMessage(0);
        break;
        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;
    //Step 1: Registering the Window Class
    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = 0;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = (LPWSTR)g_szClassName;
    wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

    if(!RegisterClassEx(&wc))
    {
        MessageBox(NULL, _T("Window Registration Failed!"), _T("Error!"),
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }
    // Step 2: Creating the Window
    hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        (LPCWSTR)g_szClassName,
        _T("Agenda Virtual"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 440, 220,
        NULL, NULL, hInstance, NULL);
    if(hwnd == NULL)
    {
        MessageBox(NULL, _T("Falha na criação da GUI!"), _T("Error!"),
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }
    NewContact = CreateWindowEx(
                    WS_EX_CLIENTEDGE,
                    (LPCWSTR)g_szClassName,
                    _T("Adicionar Contato"),
                    WS_OVERLAPPEDWINDOW,
                    CW_USEDEFAULT, CW_USEDEFAULT, 200, 120,
                    NULL, NULL, hInstance, NULL);
    Button1 = CreateWindowEx(0, _T("BUTTON"), _T("Adicionar Contato"),  WS_CHILD + WS_VISIBLE + WS_TABSTOP, 50, 50, 120, 20, hwnd, (HMENU)intButton1, hInstance, 0); /*Nosso button */
    Nome = CreateWindowEx(0, _T("EDIT"), _T("Nome"),  WS_CHILD + WS_VISIBLE + WS_TABSTOP, 20, 10, 120, 20, NewContact, (HMENU)intEdit1, hInstance, 0);
    Numero = CreateWindowEx(0, _T("EDIT"), _T("Numero"),  WS_CHILD + WS_VISIBLE + WS_TABSTOP, 20, 30, 120, 20, NewContact, (HMENU)intEdit2, hInstance, 0);
    Add = CreateWindowEx(0, _T("BUTTON"), _T("Adicionar Contato"),  WS_CHILD + WS_VISIBLE + WS_TABSTOP, 20, 50, 120, 20, NewContact, (HMENU)intAdd1, hInstance, 0); /*Nosso button */
    ShowWindow(Button1, nCmdShow);
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
    UpdateWindow(Button1);

    // Step 3: The Message Loop
    while(GetMessage(&Msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}