Delphi DLL

Send a Staged REST Request with a Binary Body

Demonstrates Rest.SendReqBd, which sends a request whose binary body is read from a BinData, then reads the response in separate steps.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
bAutoReconnect: Boolean;
bdBody: HCkBinData;
bLoaded: Boolean;
statusCode: Integer;
responseBody: PWideChar;

begin
success := False;

rest := CkRest_Create();
bTls := True;
bAutoReconnect := True;
success := CkRest_Connect(rest,'example.com',443,bTls,bAutoReconnect);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

//  The file paths are relative to the application's current working directory.  Absolute paths
//  may also be used.  Supply the paths appropriate to your own environment.

//  Send a request whose binary body is read from a BinData.
bdBody := CkBinData_Create();
bLoaded := CkBinData_LoadFile(bdBody,'qa_data/image.png');
if (bLoaded <> True) then
  begin
    Memo1.Lines.Add('Failed to load the request body file.');
    Exit;
  end;

CkRest_AddHeader(rest,'Content-Type','image/png');

success := CkRest_SendReqBd(rest,'PUT','/api/images/1',bdBody);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
statusCode := CkRest_ReadResponseHeader(rest);
if (statusCode < 0) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
Memo1.Lines.Add('Response status code: ' + IntToStr(statusCode));

//  Read the response body as text.
responseBody := CkRest__readRespBodyString(rest);
if (CkRest_getLastMethodSuccess(rest) = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
Memo1.Lines.Add(responseBody);

CkRest_Dispose(rest);
CkBinData_Dispose(bdBody);