Interface between a control process and a target process

G - Physics – 06 – F

Patent

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G06F 9/46 (2006.01)

Patent

CA 2342246

Indirect access and control of a target computer process from a control computer process in a multitasking computer operating system environment is described. The control process contains a dynamic linked library (DLL) file. A hook filter function is then inserted into the target process using one of the operating system commands. This forcibly maps the control process DLL into the target process memory space. The hook filter function monitors all messages from the operating system which enter the target process via its message queue. The control process places necessary arguments and data in the DLL and sends a message to the hook filter function requesting an operation within the target process. The hook filter function recognizes the message as being from the control process and that the arguments and data are in the DLL. Data may also be passed from the target process via the DLL to the control process.

La présente invention concerne l'accès et la commande indirects d'un process informatique cible à partir d'un process de commande informatique dans un environnement à système de traitement informatique multitâches. Le process de commande comprend un fichier pour bibliothèque de liens dynamiques (DLL). Une fonction de rappel est ensuite insérée dans le process cible au moyen d'une des commandes du système d'exploitation. Il en résulte un mappage à force du processus de commande DLL dans l'espace mémoire du process cible. La fonction de rappel surveille tous les messages en provenance du système d'exploitation qui entrent dans le process cible via la file d'attente des messages. Le process de commande dispose des arguments et des données nécessaires dans la bibliothèque DLL et envoie un message à la fonction de rappel pour demander l'exécution d'une opération dans le process cible. La fonction de rappel constate que le message provient du process de commande et que les arguments et données se trouvent dans la bibliothèque DLL. Des données peuvent également être transmises du process cible au process de commande via la bibliothèque DLL.

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