(MFC) Download a Zip from a URL and OpenBd. (No .zip file is created)

Demonstrates how to download a .zip from a URL, opens the Zip, and gets the contents of a file. No file is ever written.

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

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkBinData.h>
#include <CkZip.h>
#include <CkZipEntry.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkHttp http;

    CkBinData bd;

    // This URL is valid and can be tested...
    bool success = http.QuickGetBd("http://chilkatdownload.com/example_data/hamlet.zip",bd);
    if (http.get_LastMethodSuccess() != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkZip zip;

    // Open the zip from the bytes contained in bd.
    success = zip.OpenBd(bd);
    if (success == false) {
        strOut.append(zip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the entry for the file we want..
    CkZipEntry *entry = zip.GetEntryByName("hamlet.xml");
    if (zip.get_LastMethodSuccess() != true) {
        strOut.append(zip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Convert all line endings to CRLF (if needed)
    int lineEndingBehavior = 2;
    const char *xmlStr = entry->unzipToString(lineEndingBehavior,"utf-8");
    if (entry->get_LastMethodSuccess() != true) {
        strOut.append(entry->lastErrorText());
        strOut.append("\r\n");
        delete entry;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The XML in this case is about 274K, so let's just examine the last 20 lines...
    CkStringBuilder sb;
    sb.Append(xmlStr);

    strOut.append(sb.lastNLines(20,true));
    strOut.append("\r\n");

    delete entry;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }