Read_Write File

#include <stdio.h>
#include <stdlib.h>
#include <Windows.h>
#include <strsafe.h>
#include <tchar.h>

#define _UNICODE
#define UNICODE

int _tmain(int argc, TCHAR *argv[])
{
    char *buffer;
    if (argc == 4)
    {

        char *p;
        int number_of_bytes = strtol(argv[3], &p, 10);
        printf("Number of bytes to read is %d", number_of_bytes);
        printf("\n%s\n%s", argv[1], argv[2]);

        DWORD dwBytesWritten = 0;


        buffer = (char*)malloc(number_of_bytes * sizeof(char));


        HANDLE h = CreateFile(argv[1],               // file to open
            GENERIC_READ,          // open for reading
            0,       // share for reading
            NULL,                  // default security
            OPEN_EXISTING,         // existing file only
            FILE_ATTRIBUTE_NORMAL, // normal file
            NULL);                 // no attr. template
        //DWORD a = GetLastError();
        //if (a) { printf("\nWriting to the File error is: %d", a); }

        ReadFile(h, buffer, number_of_bytes, NULL, NULL);
        DWORD c = GetLastError();
        if (c) { printf("\nReading to the File error is: %d", c); }
        CloseHandle(h);


        DWORD dwBytesToWrite = (DWORD)strlen(buffer);

        //printf("%s\n\n", buffer);
        //printf("The size of the buffer is %d", sizeof(buffer));

        HANDLE file_write = CreateFile(argv[2], GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
        DWORD last_error = GetLastError();
        if (last_error){ printf("\nFile to write error is: %d", last_error); }

        WriteFile(file_write, buffer, dwBytesToWrite, &dwBytesWritten, NULL);
        DWORD b = GetLastError();
        if(b){ printf("\nWriting to the File error is: %d", b); }
        CloseHandle(file_write);
        scanf("%d");
    }
    return 0;
}