[Código-GUI] File exists ? - JaAViEr

#include <windows.h>
#include <fstream>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/*  Make the class name into a global variable  */
char szClassName[ ] = "CodeBlocksWindowsApp";
HINSTANCE miinstance;
int WINAPI WinMain (HINSTANCE hThisInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpszArgument,
                     int nCmdShow)
{
    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */
miinstance=hThisInstance;
    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows's default colour as the background of the window */
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let's create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "File Exist ? - JaAViEr",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           300,                 /* The programs width */
           100,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nCmdShow);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


/*  This function is called by the Windows function DispatchMessage()  */

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
            static char texto[200];
            case WM_CREATE:
            static HWND mostrar = CreateWindowEx(0,"BUTTON", "Enviar", WS_CHILD|WS_VISIBLE|WS_TABSTOP, 0,45, 100, 20, hwnd, 0, miinstance, NULL);
            static HWND nombre = CreateWindowEx(WS_ACTIVECAPTION,"Edit", NULL, WS_CHILD|WS_VISIBLE|WS_TABSTOP, 100, 0, 190, 23, hwnd, 0, miinstance, NULL);
            static HWND staticname = CreateWindowEx(0,"STATIC", "Nombre:", WS_CHILD|WS_VISIBLE|WS_TABSTOP, 0, 0, 100, 18,hwnd, 0, miinstance, NULL);
            break;
            case WM_COMMAND:
            if((HWND)lParam==mostrar){
            GetWindowText(nombre,texto,200);
             if(FILE * archivo = fopen(texto, "r")){
            static HWND resultado = CreateWindowEx(0,"STATIC", "Archivo Existe", WS_CHILD|WS_VISIBLE|WS_TABSTOP, 0, 23, 150, 18,hwnd, 0, miinstance, NULL);
                 MessageBox(hwnd, "El Archivo Existe", "Resultado", MB_OK);
                 }else{
            static HWND resultado = CreateWindowEx(0,"STATIC", "Archivo No Existe", WS_CHILD|WS_VISIBLE|WS_TABSTOP, 0, 23, 150, 18,hwnd, 0, miinstance, NULL);
                 MessageBox(hwnd, "El Archivo No Existe", "Resultado", MB_OK);

                 }
 }
            break;
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;
        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}