Delphi DLL

Check if a MIME Part is Application Data

Demonstrates the Chilkat Mime.IsApplicationData method, which returns whether the Content-Type begins with application/. It takes no arguments and applies to the current part.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: The application/ family covers everything that is not plain media or text — PDFs, Office documents, ZIP archives, JSON, and the S/MIME application/pkcs7-* types. This broad check is a quick way to flag "binary document" parts, though you will usually look at the specific subtype to decide how to handle each.

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var
success: Boolean;
mime: HCkMime;
n: Integer;
part: HCkMime;
i: Integer;

begin
success := False;

//  Demonstrates the Mime.IsApplicationData method, which returns whether the Content-Type begins with application/.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

mime := CkMime_Create();
success := CkMime_LoadMimeFile(mime,'qa_data/multipart_message.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

n := CkMime_getNumParts(mime);
part := CkMime_Create();

for i := 0 to n - 1 do
  begin
    success := CkMime_PartAt(mime,i,part);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkMime__lastErrorText(mime));
        Exit;
      end;
    if (CkMime_IsApplicationData(part)) then
      begin
        Memo1.Lines.Add('Part ' + IntToStr(i) + ' (' + CkMime__contentType(part) + ') is application data.');
      end;
  end;

CkMime_Dispose(mime);
CkMime_Dispose(part);