API Tutorial - Application Programming Interface - Application Programming Interface Explained-API

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API video covers what is a API (with built in API methods), popular API examples like Microsoft Windows API, Java APIs, Web APIs and smartphone APIs with Windows API call example (source code below). Application Programming Interface documentation can include API classes and API methods functionalities, Application Programming Interface message format, API response format and Application Programming Interface error format, code snippets and notes.

0:00 Application Programming Interface Tutorial Intro
0:19 What is Application Programming Interface
2:03 Why Application Programming Interface
2:51 Application Programming Interface Examples
3:36 How to use API
4:36 How to call Windows API

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Code samples shown:
Private Declare Function GetComputerName Lib "kernel32" Alias _
"GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long

Private Declare Function GetTempPath Lib "kernel32" Alias "GetTempPathA" _
(ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long

Function FetchComputerName() As String
Dim lngResponse As Long
Dim strName As String * 32
lngResponse = GetComputerName(strName, 32)
FetchComputerName = strName
End Function

Public Function FetchTempPath() As String
Dim strPath As String * 512
Dim lngPath As Long
lngPath = GetTempPath(512, strPath)
FetchTempPath = strPath
End Function