VBMAN API Call Example

Overview

This example demonstrates how to use the VBMAN framework to call external API interfaces, including HTTP GET/POST requests, parameter settings, response parsing, and other functionalities.

Project Structure

ApiCall/
  ├── src/             # Source code directory
  │   ├── Form1.frm    # Main form
  │   └── ApiCall.vbp  # Project file
  └── dist/            # Build output directory
      └── ApiCall.exe  # Executable file

Core Code Analysis

1. API Call Example

'Create HTTP client
Dim http As New cHttpClient

'GET request example
With http
    .Get "http://api.example.com/users"
    If .Status = 200 Then
        Text1.Text = .ResponseText
    End If
End With

'POST request example
With http
    'Set request headers
    .RequestHeader.Add "Content-Type", "application/json"
    .RequestHeader.Add "Authorization", "Bearer " & token
    
    'Set POST data
    .PostData = "{""name"":""test"",""age"":18}"
    
    'Send request
    .Post "http://api.example.com/users"
    
    'Handle response
    If .Status = 200 Then
        Dim json As Object
        Set json = .ResponseJson
        Debug.Print json("id")
    End If
End With

2. File Upload Example

'File upload
With http
    .FormData.Add "file", "c:\test.jpg"
    .FormData.Add "name", "Test Image"
    .Post "http://api.example.com/upload"
End With

3. Batch Request Example

'Concurrent requests
With http
    .AsyncMode = True  'Enable async mode
    
    'Initiate multiple requests
    .Get "http://api1.example.com"
    .Get "http://api2.example.com"
    .Get "http://api3.example.com"
    
    'Wait for all requests to complete
    .WaitAll
    
    'Get responses
    For Each res In .AsyncResponses
        Debug.Print res.url, res.status
    Next
End With

Feature Description

1. HTTP Request Features

   • Support for GET/POST/PUT/DELETE methods
   • Form submission (application/x-www-form-urlencoded)
   • File upload (multipart/form-data)
   • JSON data (application/json)
   • Asynchronous requests

2. Request Configuration

   • Request header settings
   • Cookie management
   • Timeout settings
   • Proxy settings
   • SSL/TLS support

3. Response Handling

   • Status code checking
   • Response header parsing
   • JSON parsing
   • File downloading
   • Character set handling

Technical Points

1. HTTP protocol implementation
2. HTTPS secure communication
3. Asynchronous programming model
4. Error handling mechanism

Use Cases

1. Third-party API integration
2. Microservice communication
3. File upload and download
4. Data synchronization

Extension Suggestions

1. Add request retry mechanism
2. Implement request queue
3. Add response caching
4. Implement request rate limiting
5. Support WebSocket