Blob Functions

Convert base64 encoded string to blob

persistent object CropQualityPicture {
	blob image;
	string imageStr;
}

// Convert base64 string to blob
cropQualityPicture.image = Blob:fromString(cropQualityPicture.imageStr);

Convert blob to base64 encoded string

Similarly to the above, blobs can also be converted to base64 encoded strings:

// Convert blob to base64 string
cropQualityPicture.imageStr = Blob:toString(cropQualityPicture.image);

Convert base64 encoded string to a wrapped blob

Since blob fields on objects are automatically accompanied by meta attributes that describe mime type, file size and file name, an additional conversion is available where a base64 encoded string can be converted to a built-in object that wraps the blob and includes the above mentioned meta fields:

MezBlobResult blobWrapper = Blob:wrapFromString(cropQualityPicture.imageStr, "image/jpeg", "file_name_str");

// This assignment will assign the blob field and also copy the meta fields
cropQualityPicture.image = blobWrapper.blobData;

// Built-in wrapper object
object MezBlobResult {
	blob blobData;

	// blobData_mtype__, blobData_fname__, blobData_size__, are included by default
}

Download a file for a blob

Blobs can also be downloaded as files on the frontend. One method is to use the file browser widget. Another more flexible method is with the Mez:downloadFile built-in function.

Additional Mentions and References

• Quick Reference#DateBIFs
• Lesson 16: Math and Date Functions