Com Memory Management

The principle of memory management is: who applies for and who releases.

However, in terms of convenience and efficiency, the memory management method adopted by COM is: The function dynamically requests memory based on actual needs, and the caller is responsible for releasing the memory.

 

Com provides three memory allocation and release functions:

	BSTR	Imalloc Interface	Com Library
Application	Sysallocstring ()	Alloc ()	Cotaskmemalloc ()
Apply again	Sysreallocstring ()	Realloc ()	Cotaskrealloc ()
Release	Sysfreestring ()	Free ()	Cotaskmemfree ()

 

 

 

1. cotaskxxx () function family, which calls the library function (malloc...) of C language in essence ...);

2. The imalloc interface encapsulates the cotaskxxx () function family and enhances some functions. For example, imalloc: getsize () can be used to obtain the size. imallocspy can be used to monitor memory usage;

 

Example:

1 BSTR pstr; 2 progidfromclsid (clsid_mystringfactory, & pstr); // apply for space in the function 3 4 cotaskmemfree (pstr); // release space

 

Com Memory Management