Process32First

Retrieves information about the first process encountered in a system snapshot.

BOOL WINAPI Process32First(
  HANDLE hSnapshot,      
  LPPROCESSENTRY32 lppe  
);

Parameters

hSnapshot

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

lppe

[in/out] Pointer to a PROCESSENTRY32 structure.

Return Values

Returns TRUE if the first entry of the process list has been copied to the buffer or FALSE otherwise. The ERROR_NO_MORE_FILES error value is returned by the GetLastError function if no processes exist or the snapshot does not contain process information.

Remarks

The calling application must set the dwSize member of PROCESSENTRY32 to the size, in bytes, of the structure. Process32First 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 processes recorded in the same snapshot, use the Process32Next function.

Requirements

  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Tlhelp32.h.
  Library: Use Kernel32.lib.

See Also

Tool Help Library Overview, Tool Help Functions, , CreateToolhelp32Snapshot, PROCESSENTRY32, Process32Next