c++ base64

Un ejemplo de base64 en c++ que consegui en internet

#include "base64.h"

#include

#include

using namespace std;

int main()

{

string prueba;

prueba="hola";

string codificado = base64_encode(reinterpret_cast(prueba.c_str()), prueba.length());

std::cout << "encoded: " << codificado << std::endl;

return 0;

}

base64.h

/*

base64.cpp and base64.h

Copyright (C) 2004-2008 René Nyffenegger

This source code is provided 'as-is', without any express or implied

warranty. In no event will the author be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this source code must not be misrepresented; you must not

claim that you wrote the original source code. If you use this source code

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original source code.

3. This notice may not be removed or altered from any source distribution.

René Nyffenegger rene.nyffenegger@adp-gmbh.ch

*/

#include

static const std::string base64_chars =

"ABCDEFGHIJKLMNOPQRSTUVWXYZ"

"abcdefghijklmnopqrstuvwxyz"

"0123456789+/";

static inline bool is_base64(unsigned char c) {

return (isalnum(c) || (c == '+') || (c == '/'));

}

std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {

std::string ret;

int i = 0;

int j = 0;

unsigned char char_array_3[3];

unsigned char char_array_4[4];

while (in_len--) {

char_array_3[i++] = *(bytes_to_encode++);

if (i == 3) {

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for(i = 0; (i <4) ; i++)

ret += base64_chars[char_array_4[i]];

i = 0;

}

}

if (i)

{

for(j = i; j < 3; j++)

char_array_3[j] = '\0';

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for (j = 0; (j < i + 1); j++)

ret += base64_chars[char_array_4[j]];

while((i++ < 3))

ret += '=';

}

return ret;

}

std::string base64_decode(std::string const& encoded_string) {

int in_len = encoded_string.size();

int i = 0;

int j = 0;

int in_ = 0;

unsigned char char_array_4[4], char_array_3[3];

std::string ret;

while (in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {

char_array_4[i++] = encoded_string[in_]; in_++;

if (i ==4) {

for (i = 0; i <4; i++)

char_array_4[i] = base64_chars.find(char_array_4[i]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (i = 0; (i < 3); i++)

ret += char_array_3[i];

i = 0;

}

}

if (i) {

for (j = i; j <4; j++)

char_array_4[j] = 0;

for (j = 0; j <4; j++)

char_array_4[j] = base64_chars.find(char_array_4[j]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (j = 0; (j < i - 1); j++) ret += char_array_3[j];

}

return ret;

}

c++ postgres

Primera publicacion desde hace mucho esta mañana buscando informacion en internet de como conectarse desde c++ a postgresql

encontre el siguiente ejemplo les dejo los comandos de compilar y ejecutar

g++ -I/usr/include/postgresql/ -lpq -o test.o test.cpp

./test.o

#include

#include

#include "libpq-fe.h"

int main()

{

char state_code[3]; /* holds state code entered by user */

char query_string[256]; /* holds constructed SQL query */

PGconn *conn; /* holds database connection */

PGresult *res; /* holds query result */

int i;

conn = PQconnectdb("hostaddr=127.0.0.1 dbname=digisalud user=postgres password=1234"); /* connect to the database */

if (PQstatus(conn) == CONNECTION_BAD) /* did the database connection fail? */

{

fprintf(stderr, "Connection to database failed.\n");

fprintf(stderr, "%s", PQerrorMessage(conn));

return 1;

}

printf("Enter a state code: "); /* prompt user for a state code */

scanf("%2s", state_code);

//printf ("SELECT ambulatorio FROM ambulatorio;");

sprintf(query_string,"SELECT ambulatorio,nombre_comercial FROM ambulatorio WHERE ambulatorio = '%s'", state_code);

res = PQexec(conn, query_string); /* send the query */

if (PQresultStatus(res) != PGRES_TUPLES_OK) /* did the query fail? */

{

fprintf(stderr, "SELECT query failed.\n");

PQclear(res);

PQfinish(conn);

return 1;

}

for (i = 0; i < PQntuples(res); i++) /* loop through all rows returned */

printf("%s\n", PQgetvalue(res, i, 1)); /* print the value returned */

PQclear(res); /* free result */

PQfinish(conn); /* disconnect from the database */

return 1;

}

Borrar archivos y carpetas sin pasar por la Papelera de Reciclaje y sin modificar el registro

1)Se debe sombrear el archivo o carpeta a borrar
2)Mantener presiona la tecla Shift
3)Y luego seleccionar Eliminar "manteniendo pulsado Shift"
4)Y Se Elimina sin pasar por la papelera y mucho menos sin entrar al registro