Question

I have declared a variable as
Bitmap image;
Container storeImg;

I am storing the image as
storeImg+= image;
the image is stored as BLOB type in container

Later On when I try to retrieve the image in a Bitmap variable e.g.
Bitmap image2;
image2 = conpeek(storeImg,1);

I get an “operand mismatch error”
My question is I have declared the image as bitmap and stored in a container then why the error when I am trying to retrieve the same in a bitmap datatype only?

Thanks in advance.

Answer 1

The Bitmap extended data type is really a container.

Adding containers gives concatenation which may be (part of) your problem:

static void BitmapTest(Args _args)
{
    Bitmap image1 = [1,2,3];
    Bitmap image2 = [7,8,9];
    Container storeImg;
    ;
    storeImg += image1;
    storeImg += image2;
    print conlen(storeImg);
    pause;
}

This prints 6, not 2 as you may assume.

Also blob and container is not the same thing:

static void BitmapTest(Args _args)
{
    BinData b = new BinData();
    Bitmap image1 = b.getData();
    Bitmap image2 = b.getData();
    Container storeImg;
    ;
    storeImg += image1;
    storeImg += image2;
    image2 = conpeek(storeImg,1);
    pause;
}

This will fail because storeImg contains two blob values.

Change the assignments to:

    storeImg += [image1];
    storeImg += [image2];

This will work, because now storeImg contains two container values (containing a blob).

Also see Load and Save file from and to container field