Windows core programming Fifth Edition Study Notes (1)

Chapter 1 Error Handling

1,$ Err, HR can monitor this in the watch window of Vs to obtain the error code and detailed explanation of the Windows API that has just been executed.

2. Custom message code:

(Left to right)

31st ~ 30-bit (severity)

0 = Success

1 = informational

2 = warning

3 = Error

 

29th bits (Microsoft/customer)

(Note that the 29th-bit message code must be 1)

 

0 = Microsoft-defined code

1 = Customer-defined code

 

28th-bit (Reserved)

Must be 0

27th ~ 26-bit (Facility Code)

The first 256 values are reserved by Microsoft

 

The15 ~ 0-bit (Exception Code)

Microsoft/customer-defined code

 

3,The formatmessage function can format the message code into its corresponding string.

 

4. Application of the getlasterror () function