C/C++ :: How To Send Post Data Using Httpsendrequest
Sep 8, 2014
I'm trying to send a simple text string using httpsendrequest, everything works fine, the string is sent but I don't know how to retrieve it in the PHP server. Also when I use internetreadfile, the dwBytesRead is 0 meaning that there is no response from the server though the application works fine. This is the code that I have so far.
#define _WIN32_WINNT 0x600
#include <stdio.h>
#include <wininet.h>
#define BUFLEN 200
static const char *acceptTypes[] = {"application/x-www-form-urlencoded", NULL};
static const char *postData = "teststr=Hello+world&testval=42";
int main() {
HINTERNET hSession, hConnect, hFile;
[code].....
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Sep 15, 2014
how do i send post with data to a php page on the net using c++? im using this for a file uploading site for my school group. and also, im planning to pass this as my project. but, i cant find a concrete way on how to send post method with data to a php page. ive been fed up with a lot of answers from the net, yet, each time i try to use them, i get errors. ive tried every library you can see till the third o of google. ive also tried a wrapper from this site, but, ive got no succes. im using dev c++.
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Oct 6, 2014
My user requires that I add function to an already working C server that will send to another host via http post and existing xml file. I have googled and found C# and C++ on how to do this but nothing using C. Where do I start?
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Sep 24, 2014
I need to write an interface program in C++ to receive occasional data being sent to me from a different company from across the internet. The company says they will send the data using POST. They have given me a document that lists their data specific parameters and their meaning.
How do I receive this data in my C++ program?
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Apr 26, 2014
I have a situation where I am accessing an ASP.NET Generic Handler to load data using JQuery. But since data loaded from Javascript is not visible to the search engine crawlers, I decided to load data from C# and then cache it for JQuery. My handler contains a lot of logic that I don't want to apply again on code behind. Here is my Handler code:
public void ProcessRequest(HttpContext context) {
JavascriptSerializer jsonSerializer = new JavascriptSerializer();
string jsonString = string.Empty;
context.Request.InputStream.Position = 0;
using (var inputStream = new System.IO.StreamReader(context.Request.InputStream))
[Code] ....
I can call the function : getUserControlMarkup() from C# but I will have to apply some URL based conditions while calling it. The contentType.typeOfContent is actually based on URL parameters.
If possible to send JSON data to this handler then how to do that. I am trying to access the handler like this:
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Common.host + "Handlers/SideContentLoader.ashx?typeOfContent=1&UCArgs=cdata");
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
But its giving NullReferenceException in Handler code at line:
ContentType contentType = jsonSerializer.Deserialize<ContentType>(jsonString);
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Mar 6, 2015
how to send datapackets. When we send a data packet from device to another, say I have a "string". How Do I send it? Are data sent as a hex or binary number?If so do i first convert the "string" into hex or binary and then send it over the communication medium(say UART)??
I have two hex numbers to be sent using the UART, do i wrap it in some specific form and send it and retrieve it on the other side?Say if I have a data structure, in that case how do i send it? Sending data packets is very cruicial in an embedded system.
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Sep 3, 2014
I am writing a client-server program in C++ using C libraries. The server listens for a connection and when one is found, it is supposed to send a binary file(an image in my case) to the client. The server is sending the binary file perfectly after opening it and reading its contents into a buffer that is dynamically allocated in the SERVER file.
The problem begins when the client file is supposed to recv() the file, I do not know how I can allocate a buffer big enough for the file to be received. I know how to use malloc() and new, I prefer malloc() for executable size customization. Assuming the file being sent is 11000 bytes(note that this is an assumption and the client can not know the file size because the file size is dynamically generated by server).
How can the client generate a dynamically allocated buffer big enough to hold 11000 bytes?
OR
How can the client store the data in a buffer using recv() without knowing the file size.
Below is part of the code that does the send()'ing and recv()'ing.
SERVER
FILE *img = fopen("img.jpg", "rb");
fseek(img, 0, SEEK_END);
unsigned long filesize = ftell(img);
char *buffer = (char*)malloc(sizeof(char)*filesize);
rewind(img);
// store read data into buffer
[Code] ....
This outputs all the binary code perfectly but it is a bug because it can't be written to a file. Is there a way to dynamically increase the buffer until all filesize is received? Certainly, buffer needs to be dynamically allocated or program crashes ...
Also one more thing, when I telnet the server from command line, telnet displays all the output perfectly as well
Maybe telnet is storing data into a buffer behind the scenes, if so, how?
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Oct 26, 2014
i am making a client server application but the problem is that i cannot send data from CLIENT to SERVER , but i can receive data from SERVER to CLIENT ... Below is mt client and Server code and i also have attached both client and server files...
CLIENT CODE:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace asynclient {
[code]....
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Mar 27, 2014
I am trying to make a streambuf for a socket, which will use either WinSock or POSIX sockets depending on OS. I understand about how to send and receive data via sockets, but I don't really understand how to put that into a 'streambuf'. What functions do I need to override?
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Aug 13, 2014
private void button1_Click(object sender, EventArgs e) {
serialPort1.PortName = "COM1";
serialPort1.BaudRate = 9600;
serialPort1.DataBits = 8;
serialPort1.Parity = Parity.None;
serialPort1.StopBits = StopBits.One;
[Code]...
In my project i have a serialport control and a button, there is no error but i want to know how actually this works, i want to send and recieve the data from the serial port don't know how to do it..
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Oct 5, 2014
I found the following code in [URL] ....., that send .TXT files perfectly to php script in my server using Wininet, but when I insert a .BMP file, this file (.BMP) is correctly created and named in server side, but it is empty! I read that is necessary implement base64 encode for work properly, so how would?
PHP Code:
#include <windows.h>
#include <wininet.h>
#include <iostream>
#define ERROR_OPEN_FILE 10
#define ERROR_MEMORY 11
#define ERROR_SIZE 12
[Code] ....
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Feb 7, 2013
I'm trying to send some binary data, such as an animated gif, via an HTTP response for a simple web server.
I am having issues having the browser close the connection after receipt of the data.
I create the header such as:
"HTTP/1.1 200 OK
Content-Length: <file size>
Content-Type: <file type>
<binary data>"
This is stored in a malloc'ed char *. To add the binary data I'm using fread: fread(request + strlen(request), 1, size, fp)
I then write 'total' bits via connfd:
write(connfd, request, total)
where total = strlen(headerRequest) + size + 3 (for ending
).
The writing seems to be okay however the image doesn't load and the browser still seems to be waiting for data.
If I added "Connection: close" to the header and closed connfd myself the page loads fine. Obviously, for efficiency purposes, I'd rather only close connfd once read() returns 0.
The header creation code is below:
======= Code:
/* Try to get file */
strcat(cwd, file);
if(endsWith (cwd, ".html") || endsWith(cwd, ".htm")) {
strcpy(fileType, "text/html");
binary = 0;
} else if (endsWith(cwd, ".txt")) {
strcpy(fileType, "text/plain");
binary = 0;
[Code]...
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Mar 13, 2013
Is there any standard USB protocol which i can follow to send data to my embedded board(and vice versa). I have no clue on USB programming using c,is there any example code i could follow,
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Mar 4, 2014
I made a game, but to finish i need to communicate the users score to a website. i want it to post the score. i tried to look this up but it all went above my head. is there a simple way to do this?
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Sep 25, 2012
How do I do a get/post for an array in c#? In C#, you get and set variables like this:
public int ID { get; set; }
How would one get and set an array in C#?
This will not work:
public uint [5] BIG_Hash {get; set;}
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Mar 21, 2015
I'm building a project in my free time and in the last part of it I need to fill a form of a website and then 'hit submit', but how it can be done. Btw the form is a 'POST' form so it's harder than a 'GET' one.
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May 21, 2014
i have a page (which i did not create) which opens as a modeless box with a save button. The save works great in saving comments. However the client wants to have the comments update on the page where the link is for the editable modeless box. is there a way to post pack to the original page to force the page to refresh the information?
info:
All information is gathered on the page load event.
there is a section that shows all the comments for a certain item
a link to edit the comments that opens up a modeless box
save button in the modeless box
I have tried the
Page.ResolveUrl(
And response redirect but they give me errors of unknown url) i am guessing it has something to do with the dynamic data crap.
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Apr 22, 2014
I have issues with this i am new to winsock. so i was learning to use winsock for http POST request
Compiles correctly, but doesnt connect i get the error "Connection Failure" what do you think can be wrong
My code goes like this:
Code: #define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include <cstdio>
#include <cstdlib>
#include <Winsock2.h>
[Code] .....
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Oct 3, 2012
I sew lot of sample for ASP WEB API. In althose link the post method is using
HttpResponseMessage as return tyope
Is it possible to use return type bool in WEB API post method?
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Feb 26, 2013
I am trying to develop a function which prints a binary tree using post-order traversal (left, right, root) but I am experiencing some troubles. The code is compiled but when I run the program it crashes right before printing the post-order traversal.
Below you can find my code and the output from debugging.
Code:
/**
Program which represents a Binary Search Tree and is modified with the following functions:
- smallest() - member function which searches for the smallest element in the tree.
- preorder() - member function which prints the tree nodes using pre-order traversal
- postorder() - member function which prints the tree nodes using post-order traversal (to be completed)
*/
#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
class TreeNode {
public:
[code]...
This is from the debugger log:
Child process PID: 5720
At C:Program Files (x86)CodeBlocksProjectsTestmain.cpp:316
At C:Program Files (x86)CodeBlocksProjectsTestmain.cpp:317
At C:Program Files (x86)CodeBlocksProjectsTestmain.cpp:318
At C:Program Files (x86)CodeBlocksProjectsTestmain.cpp:319
Program received signal SIGSEGV, Segmentation fault.
At C:Program Files (x86)CodeBlocksProjectsTestmain.cpp:279
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Dec 2, 2014
My first time programming sth in Network. I have to use C to send a file to another PC, well COM port are useful but I didn't find how to refer to the address of my destination.
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Apr 1, 2014
i developed 2programm that the first one is in C and the second one is in c#.and now i have to send some string text from c to c#.how can i do that in c ?
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Apr 9, 2013
I'm connecting to my website through sockets, like this:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <string.h>
int main(int argc, char *argv[]) {
WSADATA wsadata;
if (WSAStartup(MAKEWORD(2,2), &wsadata) == -1)
[Code]...
I want to send GET to a certain web page. How can I do that?
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Jul 3, 2014
I was wondering if there was a way for me to send information, say a username and password, to a webpage via a c++ function. I was unsure how exactly to word it, but I did attempt to google it. Here is an example of what I mean.
App starts -> goes to "Https://www.my-site.com/?user=$username&password=$password" -> username/password is valid -> logs them in on desktop app
I do not know much about php, but I am assuming the ?user=$username is setting a variable, correct? I am familiar with sockets, but it seems using the above method, this could be possible without sockets, would it?
Important part:
That is the method that minecraft uses to login players, the question here is what function could I start to send the desktop app to the webpage.
EDIT:: After looking a little more I find that it is probably not possible without sockets, which is fine; however I don't know how to do it still, I would prefer to not use external libraries, such as Curl.
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Aug 4, 2014
so im just getting into network programming and im trying to make a chat server and client so i can send and receive messages. I have written both a chat and a client, with no error reporting (i know, i know). But the message that comes through on the server side is "hiiinaovH+". Ive represented this as well as i can but really they are non alphabetic symbols coming through.
client code:
#include <iostream>
#include <winsock2.h>
int main()
{
[Code]....
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