Thread32First

This function retrieves information about the first thread of any process encountered in a system snapshot.

At a Glance

Syntax

BOOL WINAPI Thread32First( HANDLE hSnapshot, LPTHREADENTRY32 lpte);

Parameters

hSnapshot

Handle to the snapshot returned from a previous call to the CreateToolhelp32Snapshot function.

lpte

Pointer to a THREADENTRY32 structure.

Return Value

TRUE indicates that the first entry of the thread list has been copied to the buffer. FALSE indicates failure. The ERROR_NO_MORE_FILES error value, returned by GetLastError, indicates that no threads exist or the snapshot does not contain thread information.

Remarks

The calling application must set the dwSize member of THREADENTRY32 to the size, in bytes, of the structure. Thread32First changes dwSize to the number of bytes written to the structure. This will never be greater than the initial value of dwSize, but it may be smaller. If the value is smaller, do not rely on the values of any members whose offsets are greater than this value.

To retrieve information about other threads recorded in the same snapshot, use the Thread32Next function.