Unicode C

Attach a File with an Explicit Content Type

Demonstrates the Chilkat Email.AddFileAttachment2 method, which attaches a file from the filesystem and lets you explicitly specify its content type rather than having Chilkat infer it from the file extension. This example attaches a binary file as application/octet-stream.

Background: Extension-based type detection is convenient but not always right — a file may have an unusual or missing extension, or you may need a very specific MIME type for the recipient to process it correctly. Specifying the content type explicitly removes the guesswork. application/octet-stream is the generic "arbitrary binary data" type, a safe default that tells the client to treat the attachment as an opaque download rather than trying to render it.

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkEmailW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmailW email;

    success = FALSE;

    //  Demonstrates the AddFileAttachment2 method, which attaches a file and lets you
    //  explicitly specify its content type instead of letting Chilkat infer it.

    email = CkEmailW_Create();
    CkEmailW_putSubject(email,L"Email with a file attachment");
    CkEmailW_putBody(email,L"Please see the attached file.");

    //  Attach a file, explicitly specifying the content type.
    success = CkEmailW_AddFileAttachment2(email,L"qa_data/attachments/data.bin",L"application/octet-stream");
    if (success == FALSE) {
        wprintf(L"%s\n",CkEmailW_lastErrorText(email));
        CkEmailW_Dispose(email);
        return true;
    }

    wprintf(L"NumAttachments = %d\n",CkEmailW_getNumAttachments(email));

    //  Note: The path "qa_data/attachments/data.bin" is a relative local filesystem path,
    //  relative to the current working directory of the running application.


    CkEmailW_Dispose(email);

    }