Delphi DLL Requires Chilkat v11.0.0+

Create Binary MIME

See more MIME Examples

Demonstrates how to create and save a multipart/mixed MIME document where the parts (a JPG and a PDF) are NOT base64 encoded, but are instead binary. Delphi DLL

var
success: Boolean;
mime: HCkMime;
jpgPart: HCkMime;
pdfPart: HCkMime;
binData: HCkBinData;
email: HCkEmail;
sb: HCkStringBuilder;

begin
success := False;

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

mime := CkMime_Create();

CkMime_SetBodyFromPlainText(mime,'This is the plain text body.');
CkMime_ConvertToMultipartMixed(mime);
CkMime_AppendPartFromFile(mime,'qa_data/jpg/penguins.jpg');
CkMime_AppendPartFromFile(mime,'qa_data/pdf/fishing.pdf');

//  At this point, when saved, the MIME bodies will be base64 encoded.
CkMime_SaveMime(mime,'qa_output/sample.txt');

//  We now have the following MIME where everything is base64 encoded:
//  The code that follows shows how to eliminate the base64 to make this binary MIME.

//  	Content-Type: multipart/mixed; boundary="------------000207060703080505060404"
//  
//  	--------------000207060703080505060404
//  	Content-Type: text/plain
//  	Content-Transfer-Encoding: 7bit
//  
//  	This is the plain text body.
//  	--------------000207060703080505060404
//  	Content-Disposition: attachment; filename="penguins.jpg"
//  	Content-Type: image/jpeg; name="penguins.jpg"
//  	Content-Transfer-Encoding: base64
//  
//  	/9j/4AAQSkZJRgABAgEAYABgAAD/7gAOQWRvYmUAZAAAAAAB/+ESCEV4aWYAAE1NACoAAAAIAAcB
//  	MgACAAAAFAAAAGIBOwACAAAABwAAAHZHRgADAAAAAQAEAABHSQADAAAAAQA/AACcnQABAAAADgAA
//  	...
//  	800a1MlLipJHlyU9en7sqVPkBK+gBj+o+1E91Ld7iJk0pJDO5PmDk4FOGOHy6S3JW120W1uCJ5M0
//  	PBa54edOFAc8ePX/2Q==
//  
//  	--------------000207060703080505060404
//  	Content-Disposition: attachment; filename="fishing.pdf"
//  	Content-Type: application/pdf; name="fishing.pdf"
//  	Content-Transfer-Encoding: base64
//  
//  	JVBERi0xLjMKJcfsj6IKNSAwIG9iago8PC9MZW5ndGggNiAwIFIvRmlsdGVyIC9GbGF0ZURlY29k
//  	ZT4+CnN0cmVhbQp4nM1c288cNxVX09A0myq35tom7bSl8E1hp76P/YpASIiXlEg8tDwVKEJfilIe
//  	...
//  	MDRGMT48OTlENkRFQzExQjkzNjA0Mjc1RUFCNzIyMjI4RjA0RjE+XQo+PgpzdGFydHhyZWYKMjk0
//  	MzY5CiUlRU9GCg==
//  
//  	--------------000207060703080505060404--
//  

//  To make it binary MIME (getting rid of the base64), set the Encoding property to "binary"
//  for the JPG and PDF parts.

jpgPart := CkMime_Create();
CkMime_PartAt(mime,1,jpgPart);

CkMime_putEncoding(jpgPart,'binary');

pdfPart := CkMime_Create();
CkMime_PartAt(mime,2,pdfPart);

CkMime_putEncoding(pdfPart,'binary');

//  Now save it.  If you try to view this MIME in a text editor,
//  the JPG and PDF parts will be garbled and unintelligible. That's because
//  the bytes do not represent characters.
CkMime_SaveMime(mime,'qa_output/sampleBinary.mim');

//  The MIME now contains this:

//  	Content-Type: multipart/mixed; boundary="------------000207060703080505060404"
//  
//  	--------------000207060703080505060404
//  	Content-Type: text/plain
//  	Content-Transfer-Encoding: 7bit
//  
//  	This is the plain text body.
//  	--------------000207060703080505060404
//  	Content-Disposition: attachment; filename="penguins.jpg"
//  	Content-Type: image/jpeg; name="penguins.jpg"
//  	Content-Transfer-Encoding: binary
//  
//  	<Binary Data Here>
//  
//  	--------------000207060703080505060404
//  	Content-Disposition: attachment; filename="fishing.pdf"
//  	Content-Type: application/pdf; name="fishing.pdf"
//  	Content-Transfer-Encoding: binary
//  
//  	<Binary Data Here>
//  
//  	--------------000207060703080505060404--
//  

//  Can we load this binary MIME into an Email object?
binData := CkBinData_Create();
//  Write the binary MIME into binData;
CkMime_GetMimeBd(mime,binData);

email := CkEmail_Create();
//  Load the email from the binData.
CkEmail_SetFromMimeBd(email,binData);

//  Note: Many email clients may not be able to correctly process emails
//  using the binary encoding.  Thunderbird has trouble.  Windows Live Mail
//  worked OK.
CkEmail_putSubject(email,'Binary MIME Email');
CkEmail_putFrom(email,'admin@chilkatsoft.com');
CkEmail_AddTo(email,'Chilkat','support@chilkatsoft.com');
CkEmail_SaveEml(email,'qa_output/binaryEmail.eml');

//  Chilkat does not recommend trying to use binary MIME for email.
//  Binary MIME is typically used in HTTP for uploads and downloads.
//  

//  Also, binary MIME is not representable in a string.  
//  If we try to get the MIME as a string, then it must be encoded
//  using base64.

//  Chilkat automatically changes binary encodings to base64
//  when there's an attempt to get the MIME as a string.
sb := CkStringBuilder_Create();
CkEmail_GetMimeSb(email,sb);
CkStringBuilder_WriteFile(sb,'qa_output/email_fromSb.eml','utf-8',False);

//  Likewise, if we try to get the MIME as a string from the Mime object, 
//  it cannot contain non-character data in a binary encoding.  The binary
//  bytes MUST be in base64.  The act of trying to retrieve the MIME in string
//  format will force Chilkat to convert binary encodings (for non-text parts)
//  to base64.
CkMime_GetMimeSb(mime,sb);
CkStringBuilder_WriteFile(sb,'qa_output/mime_fromSb.eml','utf-8',False);

//  However, the above use of base64 is just for the purpose of making the MIME
//  string friendly.  If we save the MIME to a file, it's still binary:
CkMime_SaveMime(mime,'qa_output/mime_binary.mime');

CkMime_Dispose(mime);
CkMime_Dispose(jpgPart);
CkMime_Dispose(pdfPart);
CkBinData_Dispose(binData);
CkEmail_Dispose(email);
CkStringBuilder_Dispose(sb);