Delphi DLL

WhatsApp - Change a User Password

Demonstrates how to change the password for a WhatsApp Business API user account. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
json: HCkJsonObject;
sbRequestBody: HCkStringBuilder;
resp: HCkHttpResponse;
sbResponseBody: HCkStringBuilder;
jResp: HCkJsonObject;
respStatusCode: Integer;
username: 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 PUT https://example.com/v1/users/username \
//   -H "Authorization: Bearer your-auth-token" \
//   -d '{"password": "new-password"}'

// The following JSON is sent in the request body.

// {
//   "password": "new-password"
// }

json := CkJsonObject_Create();
CkJsonObject_UpdateString(json,'password','new-password');

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

sbRequestBody := CkStringBuilder_Create();
CkJsonObject_EmitSb(json,sbRequestBody);

resp := CkHttpResponse_Create();
success := CkHttp_HttpSb(http,'PUT','https://example.com/v1/users/username',sbRequestBody,'utf-8','application/json',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)

// {
//   "users": [
//     {
//       "username": "username"
//     }
//   ]
// }

// Sample code for parsing the JSON response...

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

CkHttp_Dispose(http);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbRequestBody);
CkHttpResponse_Dispose(resp);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);

end;