Opens an existing local process object.
Syntax
HANDLE WINAPI OpenProcess(
__in DWORD dwDesiredAccess,
__in BOOL bInheritHandle,
__in DWORD dwProcessId
);
Parameters
- dwDesiredAccess [in]
-
The access to the process object. This access right is checked against the security descriptor for the process. This parameter can be one or more of the
process access rights.
If the caller has enabled the SeDebugPrivilege privilege, the requested access is granted regardless of the contents of the security descriptor.
- bInheritHandle [in]
-
If this value is TRUE, processes created by this process will inherit the handle. Otherwise, the processes do not inherit this handle.
- dwProcessId [in]
-
The identifier of the local process to be opened.
If the specified process is the System Process (0x00000000), the function fails and the last error code is ERROR_INVALID_PARAMETER. If the specified process is the Idle process or one of the CSRSS processes, this function fails and the last error code is ERROR_ACCESS_DENIED because their access restrictions prevent user-level code from opening them.
Return Value
If the function succeeds, the return value is an open handle to the specified process.
If the function fails, the return value is NULL. To get extended error information, call
GetLastError.
Remarks
To open a handle to another local process and obtain full access rights, you must enable the SeDebugPrivilege privilege. For more information, see Changing Privileges in a Token.
The handle returned by the
OpenProcess function can be used in any function that requires a handle to a process, such as the
wait functions, provided the appropriate access rights were requested.
When you are finished with the handle, be sure to close it using the CloseHandle function.
Examples
For an example, see
Taking a Snapshot and Viewing Processes.
Requirements
| Minimum supported client | Windows 2000 Professional |
|---|
| Minimum supported server | Windows 2000 Server |
|---|
| Header | Winbase.h (include Windows.h) |
|---|
| Library | Kernel32.lib |
|---|
| DLL | Kernel32.dll |
|---|
See Also
- AssignProcessToJobObject
- CloseHandle
- CreateProcess
- CreateRemoteThread
- DuplicateHandle
- GetCurrentProcess
- GetCurrentProcessId
- GetExitCodeProcess
- GetModuleFileNameEx
- GetPriorityClass
- Process and Thread Functions
- Processes
- ReadProcessMemory
- SetPriorityClass
- SetProcessWorkingSetSize
- TerminateProcess
- VirtualProtectEx
- WriteProcessMemory
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Build date: 7/2/2009