(MFC) Upload Binary File from Memory

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing.

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

See Also: Using MFC CString in Chilkat

#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkJsonObject.h>
#include <CkCache.h>
#include <CkJsonArray.h>
#include <CkFileAccess.h>
#include <CkByteData.h>

void ChilkatSample(void)
    {
    CkString strOut;

    bool success = true;

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

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope.

    CkAuthGoogle gAuth;
    gAuth.put_AccessToken("GOOGLE-DRIVE-ACCESS-TOKEN");

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

    // -------------------------------------------------------------------------
    // A multipart upload to Google Drive needs a multipart/related Content-Type
    rest.AddHeader("Content-Type","multipart/related");

    // Specify each part of the request.

    // The 1st part is JSON with information about the file.
    rest.put_PartSelector("1");
    rest.AddHeader("Content-Type","application/json; charset=UTF-8");

    // Construct the JSON that will contain the metadata about the file data to be uploaded...
    CkJsonObject json;
    json.AppendString("name","hedgehogs.jpg");
    json.AppendString("description","A cute photo of two hedgehogs.");
    json.AppendString("mimeType","image/jpeg");

    // To place the file in a folder, we must add a parents[] array to the JSON
    // and add the folder ID.  
    // In a previous example (see Build Local Metadata Cache
    // we built a local cache to make it easy to lookup file IDs given a file path.
    // Let's find the file ID for the folder "testFolder/abc/123"
    CkCache gdCache;
    gdCache.put_Level(0);
    gdCache.AddRoot("C:/ckCache/googleDrive");

    const char *folderId = gdCache.fetchText("testFolder/abc/123");
    if (gdCache.get_LastMethodSuccess() != true) {
        strOut.append("Filepath not found in cache.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkJsonArray *parents = json.AppendArray("parents");
    parents->AddStringAt(-1,folderId);
    delete parents;

    rest.SetMultipartBodyString(json.emit());

    // The 2nd part is the file content, which will contain the binary image data.
    rest.put_PartSelector("2");
    rest.AddHeader("Content-Type","image/jpeg");

    CkFileAccess fac;
    CkByteData jpgBytes;
    // Read a JPG file from the local filesystem.
    success = fac.ReadEntireFile("qa_data/jpg/hedgehogs.jpg",jpgBytes);

    // Add the bytes to our upload
    rest.SetMultipartBodyBinary(jpgBytes);

    const char *jsonResponse = rest.fullRequestMultipart("POST","/upload/drive/v3/files?uploadType=multipart");
    if (rest.get_LastMethodSuccess() != true) {
        strOut.append(rest.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // A successful response will have a status code equal to 200.
    if (rest.get_ResponseStatusCode() != 200) {
        strOut.append("response status code = ");
        strOut.appendInt(rest.get_ResponseStatusCode());
        strOut.append("\r\n");
        strOut.append("response status text = ");
        strOut.append(rest.responseStatusText());
        strOut.append("\r\n");
        strOut.append("response header: ");
        strOut.append(rest.responseHeader());
        strOut.append("\r\n");
        strOut.append("response JSON: ");
        strOut.append(jsonResponse);
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Show the JSON response.
    json.Load(jsonResponse);

    // Show the full JSON response.
    json.put_EmitCompact(false);
    strOut.append(json.emit());
    strOut.append("\r\n");

    // A successful response looks like this:
    // {
    //   "kind": "drive#file",
    //   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
    //   "name": "hedgehogs.jpg",
    //   "mimeType": "image/jpeg"
    // }

    // Get the fileId:
    strOut.append("fileId: ");
    strOut.append(json.stringOf("id"));
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }