C++

Get the Content-Location of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentLocation method, which returns the Content-Location of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object and adds it as a related item addressed by Content-Location using AddRelatedBd2, then reads it back.

Background: Content-Location is the alternative to Content-ID for linking HTML to its embedded resources. Instead of a cid: reference, the HTML keeps an ordinary-looking src="logo.png", and the matching part carries a Content-Location of logo.png. Since the image is binary, it is loaded into a BinData object and added with AddRelatedBd2. This approach is common when an existing web page is turned into an email, since the original relative URLs can stay unchanged.

Chilkat C++ Downloads

Download Chilkat for C++

C++

#include <CkEmail.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the GetRelatedContentLocation method, which returns the Content-Location of
    //  a related item.  Related items are typically images and style sheets embedded within
    //  HTML emails.  The index is zero-based.

    CkEmail email;
    email.put_Subject("GetRelatedContentLocation example");

    //  The HTML references the image by the same name used as the Content-Location.
    email.SetHtmlBody("<html><body><img src=\"logo.png\"/></body></html>");

    //  Load the image data from a file into a BinData object.
    CkBinData bdImage;
    success = bdImage.LoadFile("qa_data/images/logo.png");
    if (success == false) {
        std::cout << bdImage.lastErrorText() << "\r\n";
        return true;
    }

    //  Add the image as a related item addressed by Content-Location "logo.png".
    success = email.AddRelatedBd2(bdImage,"logo.png");
    if (success == false) {
        std::cout << email.lastErrorText() << "\r\n";
        return true;
    }

    //  Read the Content-Location of the first related item (index 0).
    const char *loc = email.getRelatedContentLocation(0);
    std::cout << "Related item 0 Content-Location: " << loc << "\r\n";

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