Method and systems for DLL/COM redirection

• US 20050060725A1
• Filed: 10/26/2004
• Published: 03/17/2005
• Est. Priority Date: 03/27/2000
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: D'Souza, David J., Wilson, Peter M., FitzSimons, RoseMarie, Harikrishnnan, Seetharaman
• Granted Patent: US 7,523,472 B2
• Time in Patent Office: Days
• US Class Current: 719/331
• CPC Class Codes: G06F 9/44536 Selecting among different versions
• CPC Class Codes: Y10S 707/99943 Generating database or data structure, e.g. via user interface
• CPC Class Codes: Y10S 707/99954 Version management

Abstract

Methods, systems and data structure are described for implementing local isolated DLL and/or COM components. A version of a shared component is stored in a local directory with an application that uses that particular version. Another version of the shared component exists on the system and is useable by any number of other computer programs. A local file is created in the local directory that indicates the presence of an isolated version of the shared component. When the application calls the shared component, the system uses the isolated version of the shared component stored locally with the application program. Thus, specific versions of components may be provided to a calling application without making any code changes to the calling application or to the component to which the calling application is bound.

Claims

1. A computer system comprising:

at least one processor; and

one or more computer readable media including computer-executable instructions that, when executed on the computer system, perform the following steps;

storing a computer application program in a first logical directory of the one or more computer readable media; and

storing a first version of a shared component and a pointer indicator in the first logical directory for execution with the computer application program on the computer system;

wherein the computer system stores at least a second version of the shared component in a second logical directory of the one or more computer readable media, and wherein the shared component is a functional component of the computer application program that is compatible therewith;

wherein the computer application program is configured to use the first version of the shared component and not the second version of the shared component when the computer application program is executed on the computer system based on the pointer indicator being present in the first logical directory.

2. The computer system as recited in claim 1, wherein the computer-executable instructions of the one or more computer readable media includes a library loading routine that loads the first version of the shared component when the point indicator is present in the first logical directory.

3. The computer system as recited in claim 1, wherein the pointer indicator comprises at least a file name, the pointer indicator indicating to the computer application program that the first version of the shared component referenced by the pointer indicator is located in the first logical directory.

4. The computer system as recited in claim 3, wherein the pointer indicator comprises an empty file.

5. A method comprising:

a step for calling a shared component in a computer system;

a step for detecting a local file that indicates the presence of a locally-stored version of the shared component, the local file being a different file than the shared component itself; and

in response to detecting the local file in the step for detecting, a step for utilizing the locally-stored version of the shared component that is stored in a first directory of the computer system instead of a global version of the shared component stored in a second directory of the computer system.

6. The method as recited in claim 5, further comprising:

a step for searching for the local file when the shared component is called; and

if the local file is not found in the step for searching, a step for utilizing the global version of the shared component.

7. The method as recited in claim 5, wherein the step for calling comprises:

a step for calling, by a computer application program, a pathname of the shared component.

8. The method as recited in claim 7, further comprising:

in response to detecting the local file in the step for detecting, a step for converting the pathname of the shared component to a pathname referenced by the local file that indicates the presence of the locally-stored version of the shared component.

9. A computer system comprising:

first storage means for storing a computer application program in a first directory of the computer system that maintains a multiple-level directory structure;

second storage means for storing a local version of a shared component in the first directory for execution with the computer application program on the computer system, wherein the computer system stores at least another version of the shared component in a second directory of the computer system; and

wherein the computer system is configured such that the computer application program utilizes the local version of the shared component and not the other version of the shared component when the computer application program is executed on the computer system.

10. The computer system as recited in claim 9, further comprising:

third storage means for storing a file in the first directory of the computer system that indicates the local version of the shared component is stored in the first directory.

11. The computer system as recited in claim 9, wherein the shared component stored in the computer system is a component object model (COM) component.

12. The computer system as recited in claim 9, wherein the shared component stored in the computer system is a dynamic-link library (DLL) component.

13. A computer system comprising:

a first directory that contains a pointer to a global version of a shared component useable by a plurality of computer programs;

a second directory that contains a pointer to an application program and a pointer to a local version of the shared component; and

wherein the application program utilizes the local version of the shared component when the application program calls the shared component.

14. The computer system as recited in claim 13, wherein the second directory further includes an indicator that indicates the existence of the local version of the shared component.

15. The computer system as recited in claim 14, wherein the indicator includes a pointer to a file having a name of a pre-defined type.

16. The computer system as recited in claim 13, wherein the shared component is a component object model (COM) component or a dynamic-link library (DLL) component.

17. The computer system as recited in claim 13, wherein the first directory and the second directory comprise at least part of a directory tree data structure.

18. One or more computer readable media including computer-executable instructions comprising:

means for storing a computer application program in the one or more computer readable media;

means for storing a first version of a shared component in the one or more computer readable media for execution on a computer system that stores at least a second version of the shared component, wherein at least the first version of the shared component is a functional component of the computer application program that is compatible therewith;

means for establishing a logical relationship between the computer application program and the first version of the shared component so that the computer application program uses the first version of the shared component and not the second version of the shared component when the computer application program is executed on the computer system; and

wherein the means for establishing a logical relationship between the computer application program and the first version of the shared component includes means for configuring a logical directory data structure that has multiple logical directories so that the computer application program and the first version of the shared component are referenced within a first logical directory, and wherein the second version of the shared component is referenced within a second logical directory.

19. The one or more computer readable media as recited in claim 18, wherein the second version of the shared component comprises a global version of the shared component.

20. The one or more computer readable media as recited in claim 18, wherein the one or more computer readable media include computer-executable instructions further comprising:

means for storing another computer application program in the one or more computer readable media;

wherein the means for establishing a logical relationship comprises means for establishing a logical relationship between the other computer application program and the second version of the shared component so that the other computer application program uses the second version of the shared component and not the first version of the shared component when the other computer application program is executed on the computer system; and

wherein the means for establishing a logical relationship further includes means for configuring the logical directory data structure so that the other computer application program and the second version of the shared component are referenced within the second logical directory.