| Platform SDK: Debugging and Error Handling |
The SetLastError function sets the last-error code for the calling thread.
VOID SetLastError( DWORD dwErrCode // per-thread error code );
This function does not return a value.
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 indicate that the error code has been defined by your application and to ensure that your error code does not conflict with any system-defined error codes.
This function is intended primarily for dynamic-link libraries (DLL). Calling this function after an error occurs lets the DLL emulate the behavior of the Win32 API.
Most Win32 functions call SetLastError when they fail. Function failure is typically indicated by a return value error code such as zero, NULL, or –1. Some functions call SetLastError under conditions of success; those cases are noted in each function's reference topic.
Applications can retrieve the value saved by this function by using the GetLastError function. The use of GetLastError is optional; an application can call it to find out the specific reason for a function failure.
The last-error code is kept in thread local storage so that multiple threads do not overwrite each other's values.
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Winbase.h; include Windows.h.
Library: Use Kernel32.lib.
Error Handling Overview, Error Handling Functions, GetLastError, SetLastErrorEx