Delphi DLL Requires Chilkat v11.0.0+

WhatsApp - Upload Media

Demonstrates how to upload media to the WhatsApp Business API client. The POST body must contain the binary media data and the Content-Type header must be set to the type of the media being uploaded. Delphi DLL

var
success: Boolean;
http: HCkHttp;
bdRequestBody: HCkBinData;
resp: HCkHttpResponse;
sbResponseBody: HCkStringBuilder;
jResp: HCkJsonObject;
respStatusCode: Integer;
id: PWideChar;
i: Integer;
count_i: Integer;

begin
success := False;

//  This example assumes the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

http := CkHttp_Create();

//  Implements the following CURL command:

//  curl -X POST \
//  https://your-webapp-hostname:your-webapp-port/v1/media \
//  -H 'Authorization: Bearer your-auth-token' \ 
//  -H 'Content-Type: image/jpeg'
//  --data-binary @your-file-path

//  Use the following online tool to generate HTTP code from a CURL command
//  Convert a cURL Command to HTTP Source Code

bdRequestBody := CkBinData_Create();
success := CkBinData_LoadFile(bdRequestBody,'your-file-path');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load your-file-path');
    Exit;
  end;

//  Adds the "Authorization: Bearer your-auth-token" header.
CkHttp_putAuthToken(http,'your-auth-token');

resp := CkHttpResponse_Create();
success := CkHttp_HttpBd(http,'POST','https://your-webapp-hostname:your-webapp-port/v1/media',bdRequestBody,'image/jpeg',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

sbResponseBody := CkStringBuilder_Create();
CkHttpResponse_GetBodySb(resp,sbResponseBody);
jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);
CkJsonObject_putEmitCompact(jResp,False);

Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(CkJsonObject__emit(jResp));

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

//  Sample JSON response:
//  (Sample code for parsing the JSON response is shown below)

//  {
//    "messages": [
//      {
//        "id": "gBEGkYiEB1VXAglK1ZEqA1YKPrU"
//      }
//    ]
//  }

//  Sample code for parsing the JSON response...
//  Use the following online tool to generate parsing code from sample JSON:
//  Generate Parsing Code from JSON

i := 0;
count_i := CkJsonObject_SizeOfArray(jResp,'messages');
while i < count_i do
  begin
    CkJsonObject_putI(jResp,i);
    id := CkJsonObject__stringOf(jResp,'messages[i].id');
    i := i + 1;
  end;

CkHttp_Dispose(http);
CkBinData_Dispose(bdRequestBody);
CkHttpResponse_Dispose(resp);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);