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Lim Bio Liong - Professional Profile



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Lim Bio Liong is a Specialist at a leading Software House in Singapore.

Bio has been in software development for over 10 years. He specialises in C/C++ programming and Windows software development.

Bio has also done device-driver development and enjoys low-level programming. Bio has recently picked up C# programming and has been researching in this area.

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GeneralGetting the Full Path to a COM DLL Pin
Lim Bio Liong24-Dec-07 20:52
Lim Bio Liong24-Dec-07 20:52 
GeneralThe meaning and use of bind1st() and bind2nd(). Pin
Lim Bio Liong24-Dec-07 20:06
Lim Bio Liong24-Dec-07 20:06 
GeneralCode snippet : GetCustomAttribute() Pin
Lim Bio Liong22-Dec-07 21:51
Lim Bio Liong22-Dec-07 21:51 
GeneralCode snippet : GetTypeLibraryPath() [modified] Pin
Lim Bio Liong22-Dec-07 21:49
Lim Bio Liong22-Dec-07 21:49 
GeneralThe IDL "custom" attribute Pin
Lim Bio Liong22-Dec-07 13:32
Lim Bio Liong22-Dec-07 13:32 
GeneralMemory Allocation And Release Pin
Lim Bio Liong21-Dec-07 23:52
Lim Bio Liong21-Dec-07 23:52 
GeneralWhat Is a "Programming Model"? Pin
Lim Bio Liong18-Dec-07 22:42
Lim Bio Liong18-Dec-07 22:42 
GeneralConcerning making copies of and deletion of objects stored inside VARIANT parameters. Pin
Lim Bio Liong6-Dec-07 20:56
Lim Bio Liong6-Dec-07 20:56 
For a long time, I had a hard time trying to figure out the correct way to handle VARIANT parameters.

It is especially worrisome when VARIANT parameters hold objects like BSTRs, structures (VT_RECORD) and SAFEARRAYs.

Do we need to make copies of these before we insert them into VARIANTs ? And why ? Do we need to destroy these after we have inserted them into VARIANTs ?

It turned out that the answer is simple (albeit not trivial). It is analogous to the principles of reference counting for COM interface pointers. Basically :

1. In a COM method, when you need to pass an object (via a VARIANT) as an [out] parameter, you need to make a copy of it. This is similar to the fact that we AddRef() an interface pointer returned as an [out] parameter.

Hence it follows that once a copy of the object is made and inserted into the VARIANT, you do not delete it. It is the responsibility of the receiving client to delete it in its own time.

2. In a COM method, when you receive an object (via a VARIANT) as an [in] parameter, you can use it in whatever way you like but you must not delete it. This is similar to the fact that you do not Release() an interface pointer passed into a COM method as an [in] parameter.

Visual Basic is a very good tool to test whether your code follows COM standards as outlined above. If you write a COM object in VC++, and you have objects passed as [in] and [out] parameters, write a VB client code to test for robustness.
GeneralThe use of the importlib keyword in an IDL file. Pin
Lim Bio Liong17-May-07 5:12
Lim Bio Liong17-May-07 5:12 
GeneralRe: The use of the importlib keyword in an IDL file. Pin
Lim Bio Liong30-Jun-07 22:46
Lim Bio Liong30-Jun-07 22:46 
GeneralPossible For VB to use MTA objects Pin
Lim Bio Liong15-Aug-06 0:44
Lim Bio Liong15-Aug-06 0:44 
GeneralWhen do we use extern "C"? Is this a compiler-specific feature? Pin
Lim Bio Liong19-Mar-06 6:39
Lim Bio Liong19-Mar-06 6:39 
GeneralRe: When do we use extern "C"? Is this a compiler-specific feature? Pin
Yaki_1513-Sep-06 4:58
Yaki_1513-Sep-06 4:58 
GeneralConcerning Proxy/Stub DLLs [modified] Pin
Lim Bio Liong18-Mar-06 6:36
Lim Bio Liong18-Mar-06 6:36 
GeneralRe: Concerning Proxy/Stub DLLs [modified] Pin
Lim Bio Liong3-May-07 0:17
Lim Bio Liong3-May-07 0:17 
GeneralRe: Concerning Proxy/Stub DLLs Pin
Lim Bio Liong20-Jun-08 2:08
Lim Bio Liong20-Jun-08 2:08 
Generaluse of mem_fun1 and mem_fun_ref in for_each() Pin
Lim Bio Liong13-Mar-06 1:24
Lim Bio Liong13-Mar-06 1:24 
GeneralRe: use of mem_fun1 and mem_fun_ref in for_each() Pin
Lim Bio Liong13-Mar-06 1:28
Lim Bio Liong13-Mar-06 1:28 
GeneralEclipse CDT Pin
Lim Bio Liong4-Mar-06 7:34
Lim Bio Liong4-Mar-06 7:34 
GeneralRelease Minimum Dependency Project Settings Pin
Lim Bio Liong4-Mar-06 6:54
Lim Bio Liong4-Mar-06 6:54 
GeneralRe: Release Minimum Dependency Project Settings Pin
Lim Bio Liong4-Mar-06 6:56
Lim Bio Liong4-Mar-06 6:56 
GeneralTemplate Explicit Specialization & Policy-Based Design Pin
Lim Bio Liong21-Feb-06 5:31
Lim Bio Liong21-Feb-06 5:31 
GeneralRe: Template Explicit Specialization & Policy-Based Design Pin
Lim Bio Liong21-Feb-06 5:32
Lim Bio Liong21-Feb-06 5:32 
GeneralRe: Template Explicit Specialization & Policy-Based Design Pin
Lim Bio Liong21-Feb-06 5:33
Lim Bio Liong21-Feb-06 5:33 
GeneralRe: Template Explicit Specialization & Policy-Based Design Pin
Lim Bio Liong21-Feb-06 5:34
Lim Bio Liong21-Feb-06 5:34 

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