Image forming apparatus, method of controlling image forming apparatus, and memory medium for storing computer program for executing method, with interpreter for control programs that are provided for execution on OS-independent platform

A control method for controlling an image processing apparatus having a memory unit which stores predetermined function programs for controlling a function of the image processing apparatus, the function programs being defined as an interface between control programs including a command train represented in byte codes and a device driver program for controlling the function and being used commonly by the control programs, said method comprising:

• an interpreting step of interpreting the control programs including a command train;
• and
• an executing step of executing the device driver program in accordance with the interpretation of the control programs in said interpreting step,
• wherein the device driver program operates a printer engine, and
• wherein, in execution of the device driver program, the executing step controls the printer engine in a manner based on a version of interpretation software used in said interpreting step.

A non-transitory computer-readable storage medium for storing a computer program which causes a computer to execute a control method for controlling an image processing apparatus, wherein the image processing apparatus has a memory unit which stores predetermined function programs for controlling a function of the image processing apparatus, the function programs being defined as an interface between control programs including a command train represented in byte codes and a device driver program for controlling the function and being used commonly by the control programs, the method comprising:

• an interpreting step of interpreting the control programs including a command train;
• and
• an executing step of executing the device driver program in accordance with the interpretation of the control programs in said interpreting step,
• wherein the device driver program operates a printer engine, and
• wherein, in execution of the device driver program, the executing step controls the printer engine in a manner based on a version of interpretation software used in said interpreting step.