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DataFlex Examples

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(DataFlex) Upload Media for Google Photos

Demonstrates how to upload a media file (such as a JPG image) that will be placed in a Google Photos album. Uploading is a two-step process:

  1. Upload the raw bytes to a Google Server. This doesn't result in any media items being created in the user’s Google Photos account. Instead, it returns an upload token which identifies the uploaded bytes.
  2. Use the upload token to create the media item in the user’s Google Photos account. You can choose whether the media should be also added to a specific album.

This example shows step 1.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoJsonToken
    Boolean iSuccess
    Handle hoHttp
    Variant vBdMedia
    Handle hoBdMedia
    String sUrl
    Variant vResp
    Handle hoResp
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    // Get the previously obtained access token.
    // See Get Google Photos Access Token.

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonToken
    If (Not(IsComObjectCreated(hoJsonToken))) Begin
        Send CreateComObject of hoJsonToken
    End
    Get ComLoadFile Of hoJsonToken "qa_data/tokens/googlePhotos.json" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJsonToken To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Get ComStringOf Of hoJsonToken "access_token" To sTemp1
    Set ComAuthToken Of hoHttp To sTemp1

    // This is the HTTPS POST we'll be sending:
    // POST https://photoslibrary.googleapis.com/v1/uploads
    // Authorization: Bearer OAUTH2_TOKEN
    // Content-type: application/octet-stream
    // X-Goog-Upload-File-Name: FILENAME
    // X-Goog-Upload-Protocol: raw

    Send ComSetRequestHeader To hoHttp "X-Goog-Upload-File-Name" "penguins.jpg"
    Send ComSetRequestHeader To hoHttp "X-Goog-Upload-Protocol" "raw"

    // Assuming the media isn't super large, we'll just read it into memory and send.
    // (Another example exists for streaming a large media file directly from the filesystem.)

    // Load the media file into memory.
    Get Create (RefClass(cComChilkatBinData)) To hoBdMedia
    If (Not(IsComObjectCreated(hoBdMedia))) Begin
        Send CreateComObject of hoBdMedia
    End
    Get ComLoadFile Of hoBdMedia "qa_data/jpg/penguins.jpg" To iSuccess

    Move "https://photoslibrary.googleapis.com/v1/uploads" To sUrl
    Get pvComObject of hoBdMedia to vBdMedia
    Get ComPBinaryBd Of hoHttp "POST" sUrl vBdMedia "application/octet-stream" False False To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Examine the response status code.  Success is indicated by a status code of 200.
    Get ComStatusCode Of hoResp To iTemp1
    Showln "response status code: " iTemp1

    // Show the response body.
    Get ComStatusCode Of hoResp To iTemp1
    If (iTemp1 = 200) Begin
        // Success.
        Get ComBodyStr Of hoResp To sTemp1
        Showln "Upload token: " sTemp1
    End
    Else Begin
        Showln "Error:"
        Get ComBodyStr Of hoResp To sTemp1
        Showln sTemp1
    End

    Send Destroy of hoResp

    // Clear headers such as X-Goog-Upload-File-Name for subsequent HTTP requests sent on this object..
    Send ComClearHeaders To hoHttp


End_Procedure

 

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