allocate the memory of the http request data

I'm currently doing a program in c++ related to windows socket.
On the part where I'm going to receive the answer from an http request and put the data inside of a buffer, I declared the size of the buffer which is 10000, my question is how can I allocate memory during runtime and will no need to declare the size of the buffer during compiling?

Initial code for receiving the data from http request:

char buffer[10000];



// Receiving and Displaying an answer from the Web Server

    ZeroMemory(buffer, sizeof(buffer));

    while ((dataLen = recv(Socket, buffer, sizeof(buffer), 0) > 0))

    {

        int i = 0;

        while (buffer[i] >= 32 || buffer[i] == 'n' || buffer[i] == 'r') {

            cout << buffer[i];

            i += 1;

        }

    }

thanks for the help!

asked Nov 21 at 3:13

frrelmj

Please, use std::vector<char>.
– Swordfish
Nov 21 at 3:23

hi @Swordfish thanks! also, can I use new and delete operator?
– frrelmj
Nov 21 at 3:34

can I use new and delete operator? -- Over using vector? That's like asking "can I use candles instead of a flashlight?"
– PaulMcKenzie
Nov 21 at 3:36

Of course you can try and shoot yourself in the foot, but you really don't want to.
– Swordfish
Nov 21 at 3:36

Suggestion: replace buffer[i] >= 32 with buffer[i] >= ' '. More portable and the intent is clearer. Fear the Magic Number.
– user4581301
Nov 21 at 3:39

|
show 2 more comments

Initial code for receiving the data from http request:

char buffer[10000];



// Receiving and Displaying an answer from the Web Server

    ZeroMemory(buffer, sizeof(buffer));

    while ((dataLen = recv(Socket, buffer, sizeof(buffer), 0) > 0))

    {

        int i = 0;

        while (buffer[i] >= 32 || buffer[i] == 'n' || buffer[i] == 'r') {

            cout << buffer[i];

            i += 1;

        }

    }

thanks for the help!

asked Nov 21 at 3:13

frrelmj

Please, use std::vector<char>.
– Swordfish
Nov 21 at 3:23

hi @Swordfish thanks! also, can I use new and delete operator?
– frrelmj
Nov 21 at 3:34

can I use new and delete operator? -- Over using vector? That's like asking "can I use candles instead of a flashlight?"
– PaulMcKenzie
Nov 21 at 3:36

Of course you can try and shoot yourself in the foot, but you really don't want to.
– Swordfish
Nov 21 at 3:36

Suggestion: replace buffer[i] >= 32 with buffer[i] >= ' '. More portable and the intent is clearer. Fear the Magic Number.
– user4581301
Nov 21 at 3:39

|
show 2 more comments

Initial code for receiving the data from http request:

char buffer[10000];



// Receiving and Displaying an answer from the Web Server

    ZeroMemory(buffer, sizeof(buffer));

    while ((dataLen = recv(Socket, buffer, sizeof(buffer), 0) > 0))

    {

        int i = 0;

        while (buffer[i] >= 32 || buffer[i] == 'n' || buffer[i] == 'r') {

            cout << buffer[i];

            i += 1;

        }

    }

thanks for the help!

asked Nov 21 at 3:13

frrelmj

Initial code for receiving the data from http request:

char buffer[10000];



// Receiving and Displaying an answer from the Web Server

    ZeroMemory(buffer, sizeof(buffer));

    while ((dataLen = recv(Socket, buffer, sizeof(buffer), 0) > 0))

    {

        int i = 0;

        while (buffer[i] >= 32 || buffer[i] == 'n' || buffer[i] == 'r') {

            cout << buffer[i];

            i += 1;

        }

    }

thanks for the help!

c++ winsock allocation

asked Nov 21 at 3:13

frrelmj

asked Nov 21 at 3:13

frrelmj

asked Nov 21 at 3:13

frrelmj

asked Nov 21 at 3:13

frrelmj

asked Nov 21 at 3:13

frrelmj

Please, use std::vector<char>.
– Swordfish
Nov 21 at 3:23

hi @Swordfish thanks! also, can I use new and delete operator?
– frrelmj
Nov 21 at 3:34

can I use new and delete operator? -- Over using vector? That's like asking "can I use candles instead of a flashlight?"
– PaulMcKenzie
Nov 21 at 3:36

Of course you can try and shoot yourself in the foot, but you really don't want to.
– Swordfish
Nov 21 at 3:36

Suggestion: replace buffer[i] >= 32 with buffer[i] >= ' '. More portable and the intent is clearer. Fear the Magic Number.
– user4581301
Nov 21 at 3:39

|
show 2 more comments

Please, use std::vector<char>.
– Swordfish
Nov 21 at 3:23

hi @Swordfish thanks! also, can I use new and delete operator?
– frrelmj
Nov 21 at 3:34

can I use new and delete operator? -- Over using vector? That's like asking "can I use candles instead of a flashlight?"
– PaulMcKenzie
Nov 21 at 3:36

Of course you can try and shoot yourself in the foot, but you really don't want to.
– Swordfish
Nov 21 at 3:36

Suggestion: replace buffer[i] >= 32 with buffer[i] >= ' '. More portable and the intent is clearer. Fear the Magic Number.
– user4581301
Nov 21 at 3:39

Please, use std::vector<char>.
– Swordfish
Nov 21 at 3:23

hi @Swordfish thanks! also, can I use new and delete operator?
– frrelmj
Nov 21 at 3:34

can I use new and delete operator? -- Over using vector? That's like asking "can I use candles instead of a flashlight?"
– PaulMcKenzie
Nov 21 at 3:36

Of course you can try and shoot yourself in the foot, but you really don't want to.
– Swordfish
Nov 21 at 3:36

Suggestion: replace buffer[i] >= 32 with buffer[i] >= ' '. More portable and the intent is clearer. Fear the Magic Number.
– user4581301
Nov 21 at 3:39

|
show 2 more comments

1 Answer
1

active

oldest

votes

Probably, you want something like this:

std::vector<uint8_t> req_body;



/* temporary buffer */

char buffer[1024];



/* count of read bytes per chunk */

size_t read = 0;



while (read = recv(Socket, buffer, sizeof(buffer), 0))

{

    size_t old_size = req_body.size();



    /* expand body size */

    req_body.resize(old_size + read);



    /* write new chunk of data to body */

    memcpy(req_body.data() + old_size, buffer, read);

}



/* handle request */



req_body.clear();

Also, remind that there are no guarantee for completeness of data. So it is better to wait for 'Content-Length' header, then find end of headers block and wait until full length will be received before clear the body.

answered Nov 21 at 19:24

kerrytazi

28627

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Probably, you want something like this:

std::vector<uint8_t> req_body;



/* temporary buffer */

char buffer[1024];



/* count of read bytes per chunk */

size_t read = 0;



while (read = recv(Socket, buffer, sizeof(buffer), 0))

{

    size_t old_size = req_body.size();



    /* expand body size */

    req_body.resize(old_size + read);



    /* write new chunk of data to body */

    memcpy(req_body.data() + old_size, buffer, read);

}



/* handle request */



req_body.clear();

answered Nov 21 at 19:24

kerrytazi

28627

add a comment |

Probably, you want something like this:

std::vector<uint8_t> req_body;



/* temporary buffer */

char buffer[1024];



/* count of read bytes per chunk */

size_t read = 0;



while (read = recv(Socket, buffer, sizeof(buffer), 0))

{

    size_t old_size = req_body.size();



    /* expand body size */

    req_body.resize(old_size + read);



    /* write new chunk of data to body */

    memcpy(req_body.data() + old_size, buffer, read);

}



/* handle request */



req_body.clear();

answered Nov 21 at 19:24

kerrytazi

28627

add a comment |

Probably, you want something like this:

std::vector<uint8_t> req_body;



/* temporary buffer */

char buffer[1024];



/* count of read bytes per chunk */

size_t read = 0;



while (read = recv(Socket, buffer, sizeof(buffer), 0))

{

    size_t old_size = req_body.size();



    /* expand body size */

    req_body.resize(old_size + read);



    /* write new chunk of data to body */

    memcpy(req_body.data() + old_size, buffer, read);

}



/* handle request */



req_body.clear();

answered Nov 21 at 19:24

kerrytazi

28627

Probably, you want something like this:

std::vector<uint8_t> req_body;



/* temporary buffer */

char buffer[1024];



/* count of read bytes per chunk */

size_t read = 0;



while (read = recv(Socket, buffer, sizeof(buffer), 0))

{

    size_t old_size = req_body.size();



    /* expand body size */

    req_body.resize(old_size + read);



    /* write new chunk of data to body */

    memcpy(req_body.data() + old_size, buffer, read);

}



/* handle request */



req_body.clear();

answered Nov 21 at 19:24

kerrytazi

28627

answered Nov 21 at 19:24

kerrytazi

28627

answered Nov 21 at 19:24

kerrytazi

28627

answered Nov 21 at 19:24

kerrytazi

28627

add a comment |

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