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Cómo codificar una imagen en base64 y mostrarla en un contenedor HTML
- Creado 01/03/2024
- Modificado 01/03/2024
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Today I stumbled upon an old test report where I tried to display a base64 encoded picture in a container.
BASE64 encoding is a method to store binary data with codepage independent readable ASCII characters. Readable characters can be stored in an ABAP report which makes it possible to store a picture in a source code.
To encode a picture to BASE64 you will need to have a converter. There are many converters online available, e.g. this one: https://www.base64encode.net/base64-image-encoder
For demonstration I used a very small picture. I found one in the 8-bit-retro-Excel-racing-simulation galoppsim by marco.krapf in the last Galoppsim corona cup . If you do not know Galoppsim.racing so far, I recommend to visit https://galoppsim.racing/ as soon as possible,
I chose Rennpony as suitable candidate for my demonstration. Even though the marvelous graphics are in 8bit-mode I still had to convert them to a very small size. The displayed picture has a size of 21x19 pixels.
So I uploaded the small graphic to the base64-encoding website and got the following string:
This string has to be decoded into an xstring.
The xstring has to be converted to an xstring table.
This xstring table can be passed to function module DP_CREATE_URL which returns a pointer (url) to these bytes. It then can be used in CL_GUI_PICTURE control to display the data.
This is how it looks
This is how it works
BASE64 encoding is a method to store binary data with codepage independent readable ASCII characters. Readable characters can be stored in an ABAP report which makes it possible to store a picture in a source code.
To encode a picture to BASE64 you will need to have a converter. There are many converters online available, e.g. this one: https://www.base64encode.net/base64-image-encoder
For demonstration I used a very small picture. I found one in the 8-bit-retro-Excel-racing-simulation galoppsim by marco.krapf in the last Galoppsim corona cup . If you do not know Galoppsim.racing so far, I recommend to visit https://galoppsim.racing/ as soon as possible,
I chose Rennpony as suitable candidate for my demonstration. Even though the marvelous graphics are in 8bit-mode I still had to convert them to a very small size. The displayed picture has a size of 21x19 pixels.
So I uploaded the small graphic to the base64-encoding website and got the following string:
R0lGODlhFQATADMAACH5BAAAAAAALAAAAAAVABMAg////19qcHaPjo6ij5XL/p3Mx6rR3
qTS+LPUksPessjcysvl+ufbrvrclPfv1Or0+wSMEMg5F1mY6g0eztzmNA3TKEu4LYaptI
2jShbBMIahlDNwXCwDYcdQeQ6HwEDxOyiKmyNhKhj8pobYBjkl6K5TokZRKBe+3enhRnE
g3u/EbwH2aiWJfB6hfjzAa3d6ewYHDzRpWQ0SCoMJBoc0gCYOMo15hho1aiaLAAqgkRR/
aYE9iKVQPZtppwCsXREAOw==This string has to be decoded into an xstring.
The xstring has to be converted to an xstring table.
This xstring table can be passed to function module DP_CREATE_URL which returns a pointer (url) to these bytes. It then can be used in CL_GUI_PICTURE control to display the data.
The code
REPORT.
CLASS demo DEFINITION.
PUBLIC SECTION.
TYPES _url TYPE c LENGTH 200.
TYPES: BEGIN OF _graphic_row,
line(255) TYPE x,
END OF _graphic_row,
_graphic_tab TYPE STANDARD TABLE OF _graphic_row WITH DEFAULT KEY.
METHODS show.
PRIVATE SECTION.
METHODS get_image_url
RETURNING
VALUE(url) TYPE url.
METHODS convert_xstring_to_table
Pedro Pascal
Se unió el 07/03/2018
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