US 6,611,878 B2Granted

Method and apparatus for software technology injection for operating systems which assign separate process address spaces

AssigneeInternational Business Machines Corporation

InventorsMario E. De Armas, Edward D. Shockley

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Abstract

Method and apparatus for seamlessly integrating new or modified user interface features or modified functionality, to an existing target application program (100) in the context of an operating system (102) which assigns a separate process address space for each application program then operating. The disclosed invention does not require re-compiling the existing application program's source code. Rather, a novel approach is provided which allows a technology injection system (TIS) (106) to inject itself directly between a computer operating system (102) and the target program (100) so as to intercept and act upon messages and commands to the target program (100). In this way, the TIS (106) can modify any inputs and outputs of the target program (100). By performing special processing of those messages to the target application program (100) which determine the appearance of the target application user interface or which concern modified functionality, the TIS (106) can provide the new functionality to the target application program (100) and alter the appearance of its user interface. Interception of messages between the operating system (102) and the TIS (106) is achieved by utilizing operating system functions 116, or any other available computer system functions, to overwrite a pointer (138) to a window procedure (116) of the target application (100), with a pointer to a surrogate window procedure (124).

In a computer system, a method for modifying an operating feature of an existing target software application, said method comprising the steps of:

mapping to at least one of a plurality of application programs executing on said computer system, a library function containing a surrogate procedure, said at least one application program including said target software application;
upon command from an injection software application program, selectively causing only said library function mapped to said target software application to replace a first pointer in memory to a target procedure with a second pointer to said surrogate procedure, so that said surrogate procedure receives intercepted messages that would otherwise be received by said target procedure;
processing said intercepted messages to modify said operating feature of said target software application;
calling an emulation procedure from and external to said surrogate procedure to perform processing necessary for assisting said surrogate procedure in responding to said intercepted messages, said emulation procedure mapped to a process address space separate from a process address space mapped to said surrogate procedure;
calling said target procedure from said surrogate procedure to perform any processing necessary for assisting said surrogate procedure in responding to said intercepted messages;
processing in said surrogate procedure, each of said intercepted messages to determine if each of said intercepted messages requires post-processing by said surrogate procedure after any processing by said target procedure and said emulation procedure has been completed in order to modify said operating feature of said target software application;
and,
retrieving from said target procedure to said surrogate procedure, graphical user interface specification data for a graphical user interface of said target software application, whenever an intercepted one of said messages is a request from said operating system for information which will determine the appearance of the target application graphical user interface.

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Abstract

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