This function returns the calling threads last-error code value. A remote application interface (RAPI) version of this function exists, and it is named CeGetLastError.
 
DWORD GetLastError( void );
 
Return Values
 
The calling threads last-error code value indicates success. Functions set this value by calling the SetLastError function. The Return Value section of each reference page notes the conditions under which the function sets the last-error code.
 
Remarks
 
You should call the GetLastError function immediately when a functions return value indicates that such a call will return useful data. That is because some functions call SetLastError(0) when they succeed, wiping out the error code set by the most recently failed function.
 
Most functions in the Win32 API that set the threads last error code value set it when they fail; a few functions set it when they succeed. Function failure is typically indicated by a return value error code such as FALSE, NULL, 0xFFFFFFFF, or ?1. Some functions call SetLastError under conditions of success; those cases are noted in each functions reference page.
 
Error codes are 32-bit values (bit 31 is the most significant bit). Bit 29 is reserved for application-defined error codes; no system error code has this bit set. If you are defining an error code for your application, set this bit to one. That indicates that the error code has been defined by an application, and ensures that your error code does not conflict with any error codes defined by the system.
 
To obtain an error string for system error codes, use the FormatMessage function. For a complete list of error codes, see Error Values or the SDK header file WINERROR.H.