Get the Size of an Attachment

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Demonstrates the Chilkat Email.GetAttachmentSize method, which returns the size in bytes of the attachment at a given zero-based index, or -1 if the index does not identify an existing attachment. This example adds an attachment and prints its size.

Background: The size reported is that of the attachment's actual (decoded) data, not its larger Base64-encoded form on the wire. Knowing per-attachment sizes is handy for enforcing limits, showing a size next to each attachment in a UI, or deciding whether to save or skip a large part. The -1 sentinel is how the method signals an out-of-range index rather than a zero-length attachment.

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#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkEmail email;
    int sz;

    //  Demonstrates the GetAttachmentSize method, which returns the size in bytes of the
    //  attachment at the given zero-based index.  It returns -1 if the index does not identify
    //  an existing attachment.

    email = CkEmail_Create();
    CkEmail_putSubject(email,"Attachment size");

    CkEmail_AddStringAttachment(email,"notes.txt","Some notes for the attachment.");

    //  Get the size in bytes of the first attachment (index 0).
    sz = CkEmail_GetAttachmentSize(email,0);
    printf("Attachment 0 size (bytes) = %d\n",sz);


    CkEmail_Dispose(email);

    }