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web dev c++

cipher answered on November 13, 2021 Popularity 9/10 Helpfulness 2/10

answer web dev c++

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#include <string.h>
#include <stdio.h>

#include "mongoose.h"
#include "mxml.h"
#include "sqlite3.h"

/***Sqlite initialization stuff***/
//comment out everything sqlite related if you don't want sqlite, including the callback function and the include "sqlite3.h"
static int callback(void * custom, int argc, char **argv, char **azColName);
char *zErrMsg = 0;
sqlite3 *db;
int rc;

/***Just some laziness shortcut functions I made***/
typedef mxml_node_t * dom; //type "dom" instead of "mxml_node_t *"
#define c mxmlNewElement   //type "c" instead of "mxmlNewElement"
inline void t(dom parent,const char *string) //etc
{
    mxmlNewText(parent, 0, string);
}

//type "sa" instead of "mxmlElementSetAttr"
inline void sa(dom element,const char * attribute,const char * value) 
{
    mxmlElementSetAttr(element,attribute,value);
}




//The only non boilerplate code around in this program is this function
void serve_hello_page(struct mg_connection *conn)
{
    char output[1000];
    mg_send_header(conn,"Content-Type","text/html; charset=utf-8");
    mg_printf_data(conn, "%s", "<!DOCTYPE html>");
    //This literally prints into the html document


    /*Let's generate some html, we could have avoided the
     * xml parser and just spat out pure html with mg_printf_data
     * e.g. mg_printF_data(conn,"%s", "<html>hello</html>") */

    //...But xml is cleaner, here we go:
            dom html=mxmlNewElement(MXML_NO_PARENT,"html");
                dom head=c(html,"head");
                    dom meta=c(head,"meta");
                    sa(meta,"charset","utf-8");
                dom body=c(html,"body");
                    t(body,"Hello, world<<"); //The < is auto escaped, neat!
                    c(body,"br");
                    t(body,"Fred ate bred");    
                dom table=c(body,"table");
                sa(table,"border","1");

                //populate the table via sqlite
                rc = sqlite3_exec(db, "SELECT * from myCoolTable", callback, table, &zErrMsg);
                if( rc!=SQLITE_OK )
                {
                    fprintf(stderr, "SQL error: %s\n", zErrMsg);
                    sqlite3_free(zErrMsg);
                }

            mxmlSaveString (html,output,1000,  MXML_NO_CALLBACK);
            mg_printf_data(conn, "%s", output);
            mxmlDelete(html); 
}

//sqlite callback
static int callback(void * custom, int argc, char **argv, char **azColName)
{
    //this function is executed for each row
    dom table=(dom)custom;

    dom tr=c(table,"tr");
    dom td;
    int i;
    for(i=0; i<argc; i++)
    {
        td=c(tr,"td");
        if (argv[i])
            t(td, argv[i]);
        else
            t(td, "NULL");

        printf("%s == %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
    }
     printf("\n");
     return 0;
}


static int event_handler(struct mg_connection *conn, enum mg_event ev)
{
    if (ev == MG_AUTH)
    {
        return MG_TRUE;   // Authorize all requests
    }
    else if (ev == MG_REQUEST)
    {
        if (!strcmp(conn->uri, "/hello"))
        {
            serve_hello_page(conn);
            return MG_TRUE;   // Mark as processed
        }
    }
    return MG_FALSE;  // Rest of the events are not processed

}

int main(void)
{
    struct mg_server *server = mg_create_server(NULL, event_handler);
    //mg_set_option(server, "document_root", "."); //prevent dir listing and auto file serving
    //TODO can I allow file listing without dir listing in a specified directory?
    mg_set_option(server, "listening_port", "8080");


    rc = sqlite3_open("db.sqlite3", &db); 

    if( rc )
    {
        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
        sqlite3_close(db);
        return(1);
    }

    printf("Server is running on port 8080!\n");
    for (;;)
    {
        mg_poll_server(server, 1000);  // Infinite loop, Ctrl-C to stop
    }
    mg_destroy_server(&server);
    sqlite3_close(db);

    return 0;
}




/*
 * useful stuff:
 * mg_send_file(struct mg_connection *, const char *path); - serve the file at *path*/

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: softwareengineering.stackexchange.com

Tags: c++ dev-c++ web

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Contributed on Apr 28 2022

cipher

0 Answers Avg Quality 2/10

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Lol Yea!
Download link: https://sourceforge.net/projects/dev-cpp/files/Binaries/Dev-C%2B%2B%204.9.9.2/devcpp-4.9.9.2_setup.exe/downloadhttps://sourceforge.net/projects/dev-cpp/files/Binaries/Dev-C%2B%2B%204.9.9.2/devcpp-4.9.9.2_setup.exe/download

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Nov 13 2021

Velocipede

0 Answers Avg Quality 2/10

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