0xc0000005 when running the program: Access conflict occurs when the read location is 0x00000000, which may be caused by various problems introduced by COM components.

When using COM components, there may be many problems that are not a problem, such as errors in the running of cstring definitions. The solution to these problems is to initialize the components and release them,

When using components, it can be used normally only in button events or other MFC dialog box classes, but interface threads are used. Interface thread functions call functions of function COM components, must be initialized. Otherwise, the above error occurs.

: Coinitialize (null); component initialization Function

: Couninitialize (); component release function

0xc0000005 when running the program: Access conflict occurs when the read location is 0x00000000, which may be caused by various problems introduced by COM components.