APIs for platform agnostic communication

@the_dead_poeticfb.com/pupprogrammingguild

github.com/awkwardusernamemarkjayson.fuentes@pup.edu.ph

APIs for Platform Agnostic Communication

APIs ?

a set of routines, protocols, and tools for building software applications [wikipedia]

code that allows two software programs to communicate with each other [techtarget]

defines the proper way for a developer to request services from that program [computer world]

APIs are…

Dirty stuff

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i386http://ref.x86asm.net/coder32.html

/* Setup cube vertex data. */v[0][0] = v[1][0] = v[2][0] = v[3][0] = -1;v[4][0] = v[5][0] = v[6][0] = v[7][0] = 1; v[0][1] = v[1][1] = v[4][1] = v[5][1] = -1; v[2][1] = v[3][1] = v[6][1] = v[7][1] = 1; v[0][2] = v[3][2] = v[4][2] = v[7][2] = 1; v[1][2] = v[2][2] = v[5][2] = v[6][2] = -1;

/* Enable a single OpenGL light. */ glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); glLightfv(GL_LIGHT0, GL_POSITION, light_position); glEnable(GL_LIGHT0); glEnable(GL_LIGHTING);

/* Use depth buffering for hidden surface elimination. */ glEnable(GL_DEPTH_TEST);

/* Setup the view of the cube. */ glMatrixMode(GL_PROJECTION); gluPerspective( /* field of view in degree */ 40.0, /* aspect ratio */ 1.0, /* Z near */ 1.0, /* Z far */ 10.0); glMatrixMode(GL_MODELVIEW); gluLookAt(0.0, 0.0, 5.0, /* eye is at (0,0,5) */ 0.0, 0.0, 0.0, /* center is at (0,0,0) */ 0.0, 1.0, 0.); /* up is in positive Y direction */

OpenGL

#include <windows.h>

const char g_szClassName[] = "myWindowClass";

#define IDC_MAIN_EDIT 101

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam){

switch(msg){

case WM_CREATE:{

HFONT hfDefault;HWND hEdit;

hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",

WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,

0, 0, 100, 100, hwnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), NULL);

if(hEdit == NULL)MessageBox(hwnd, "Could not create

edit box.", "Error", MB_OK | MB_ICONERROR);

hfDefault = (HFONT)GetStockObject(DEFAULT_GUI_FONT);

SendMessage(hEdit, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE, 0));

}break;

Windows API

POST https://api.stripe.com/v1/charges

curl https://api.stripe.com/v1/charges \ -u sk_test_BQokikJOvBiI2HlWgH4olfQ2: \ -d amount=400 \ -d currency=usd \ -d source=tok_15doRS2eZvKYlo2C2ENn4JQh \ -d description="Charge for test@example.com"

{ "id": "ch_15e7rU2eZvKYlo2CxWE8afA9", "object": "charge", "created": 1425834404, "livemode": false, "paid": true, "status": "succeeded", "amount": 4996, "currency": "usd", "refunded": false, "source": { "id": "card_15e7rT2eZvKYlo2CXYAxysRN", "object": "card", "last4": "4242", "brand": "Visa", "funding": "credit", "exp_month": 12, "exp_year": 2018, "fingerprint": "Xt5EWLLDS7FJjR1c", "country": "US", "name": null, "address_line1": null, "address_line2": null, "address_city": null, "address_state": null, "address_zip": null, "address_country": null, "cvc_check": "pass", "address_line1_check": null, "address_zip_check": null, "dynamic_last4": null, "metadata": { }, "customer": "cus_5pnSCVpMBNlSrj" }, "captured": true, "balance_transaction": "txn_15bjRh2eZvKYlo2Ch4I6lxJ7", "failure_message": null, "failure_code": null, "amount_refunded": 0, "customer": "cus_5pnSCVpMBNlSrj", "invoice": null, "description": "Charge for DOC-AID consultation for Camden Remington", "dispute": null, "metadata": { }, "statement_descriptor": null, "fraud_details": { }, "receipt_email": null, "receipt_number": null, "shipping": null, "refunds": { "object": "list", "total_count": 0, "has_more": false, "url": "/v1/charges/ch_15e7rU2eZvKYlo2CxWE8afA9/refunds", "data": [

] }}

Web Services

(this is the s**t)

Why APIs?

LinuxAndroidWindowsAliens

Web Services

Intercommunication

RESTfula software architecture style consisting

of guidelines and best practices for creating scalable web services.

Client–serverStatelessCacheableLayered system

Requirements

Paypal/ Stripe (Billing) OpenStreetMaps [nomatim] (Geospatial

services) data.worldbank.org (everything)

Usage of APIs

Virtual Hands-onLet’s do this

Create an app that will record the number of clicks a user makes.

The client app should be able to record from mobile devices, and web.

We should be able to see how many clicks have been pressed.

Requirements

Client

Client

POST http://counter.dev/count

GET http://counter.dev/count API