(MFC) Update a String Property in XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and update the value of a string property. (If the string property does not already exist, it is created.)

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkXmp.h>
#include <CkXml.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkXmp xmp;

    // Load a JPG or TIF image file.
    bool success = xmp.LoadAppFile("qa_data/xmp/AJ_123642_1511.tif");
    if (success != true) {
        strOut.append(xmp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Num embedded XMP docs: ");
    strOut.appendInt(xmp.get_NumEmbedded());
    strOut.append("\r\n");

    // This example assumes that XMP metadata is already present in the image file.
    if (xmp.get_NumEmbedded() == 0) {
        strOut.append("No XMP metadata already exists..");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the XMP metadata.
    CkXml *xml = 0;
    xml = xmp.GetEmbedded(0);

    // Show the XML:
    strOut.append(xml->getXml());
    strOut.append("\r\n");

    // Update (overwrite) a string property.
    xmp.AddSimpleStr(*xml,"NumberofTimes","123");

    success = xmp.SaveAppFile("qa_output/updated.tif");
    if (success != true) {
        strOut.append(xmp.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Success.");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }