Add a Related Item from a BinData Object

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Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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#include <C_CkEmail.h>
#include <C_CkBinData.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmail email;
    HCkBinData bdImage;
    const char *cid;
    HCkStringBuilder sbHtml;
    int numReplaced;

    success = FALSE;

    //  Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
    //  using the contents of a BinData object, and returns the generated Content-ID.

    email = CkEmail_Create();
    CkEmail_putSubject(email,"Related image from BinData");

    //  Load the image data from a file into a BinData object.
    bdImage = CkBinData_Create();
    success = CkBinData_LoadFile(bdImage,"qa_data/images/logo.png");
    if (success == FALSE) {
        printf("%s\n",CkBinData_lastErrorText(bdImage));
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdImage);
        return;
    }

    //  Add the image as a related item; capture its generated Content-ID.
    cid = CkEmail_addRelatedBd(email,"logo.png",bdImage);
    if (CkEmail_getLastMethodSuccess(email) == FALSE) {
        printf("%s\n",CkEmail_lastErrorText(email));
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdImage);
        return;
    }

    //  Reference the related item in the HTML body by its Content-ID.
    sbHtml = CkStringBuilder_Create();
    CkStringBuilder_Append(sbHtml,"<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
    numReplaced = CkStringBuilder_Replace(sbHtml,"PLACEHOLDER_CID",cid);
    CkEmail_SetHtmlBody(email,CkStringBuilder_getAsString(sbHtml));

    printf("NumRelatedItems = %d\n",CkEmail_getNumRelatedItems(email));

    //  Note: The path "qa_data/images/logo.png" is a relative local filesystem path,
    //  relative to the current working directory of the running application.


    CkEmail_Dispose(email);
    CkBinData_Dispose(bdImage);
    CkStringBuilder_Dispose(sbHtml);

    }