Unicode C

Add a Related Item from a BinData Object

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).

Chilkat Unicode C Downloads

Download Chilkat for Unicode C

Unicode C

#include <C_CkEmailW.h>
#include <C_CkBinDataW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkEmailW email;
    HCkBinDataW bdImage;
    const wchar_t *cid;
    HCkStringBuilderW 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 = CkEmailW_Create();
    CkEmailW_putSubject(email,L"Related image from BinData");

    //  Load the image data from a file into a BinData object.
    bdImage = CkBinDataW_Create();
    success = CkBinDataW_LoadFile(bdImage,L"qa_data/images/logo.png");
    if (success == FALSE) {
        wprintf(L"%s\n",CkBinDataW_lastErrorText(bdImage));
        CkEmailW_Dispose(email);
        CkBinDataW_Dispose(bdImage);
        return true;
    }

    //  Add the image as a related item; capture its generated Content-ID.
    cid = CkEmailW_addRelatedBd(email,L"logo.png",bdImage);
    if (CkEmailW_getLastMethodSuccess(email) == FALSE) {
        wprintf(L"%s\n",CkEmailW_lastErrorText(email));
        CkEmailW_Dispose(email);
        CkBinDataW_Dispose(bdImage);
        return true;
    }

    //  Reference the related item in the HTML body by its Content-ID.
    sbHtml = CkStringBuilderW_Create();
    CkStringBuilderW_Append(sbHtml,L"<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>");
    numReplaced = CkStringBuilderW_Replace(sbHtml,L"PLACEHOLDER_CID",cid);
    CkEmailW_SetHtmlBody(email,CkStringBuilderW_getAsString(sbHtml));

    wprintf(L"NumRelatedItems = %d\n",CkEmailW_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.


    CkEmailW_Dispose(email);
    CkBinDataW_Dispose(bdImage);
    CkStringBuilderW_Dispose(sbHtml);

    }