CreateConsoleScreenBuffer

The CreateConsoleScreenBuffer function creates a console screen buffer and returns a handle of it.

HANDLE CreateConsoleScreenBuffer(

DWORD dwDesiredAccess,	// access flag
DWORD dwShareMode,	// buffer share mode
LPSECURITY_ATTRIBUTES *lpSecurityAttributes,	// pointer to security attributes
DWORD dwFlags,	// type of buffer to create
LPVOID lpScreenBufferData	// reserved
);

Parameters

dwDesiredAccess

Specifies the desired access to the console screen buffer. This parameter can be one or both of the following values:

Value	Meaning
GENERIC_READ	Requests read access to the console screen buffer, enabling the process to read data from the buffer.
GENERIC_WRITE	Requests write access to the console screen buffer, enabling the process to write data to the buffer.

dwShareMode

Specifies how this console screen buffer can be shared. This parameter can be zero, indicating that the buffer cannot be shared, or it can be one or both of the following two values:

Value	Meaning
FILE_SHARE_READ	Other open operations can be performed on the console screen buffer for read access.
FILE_SHARE_WRITE	Other open operations can be performed on the console screen buffer for write access.

lpSecurityAttributes

Pointer to a SECURITY_ATTRIBUTES structure that determines whether the returned handle can be inherited by child processes. If lpSecurityAttributes is NULL, the handle cannot be inherited.

Windows NT: The lpSecurityDescriptor member of the structure specifies a security descriptor for the new console screen buffer. If lpSecurityAttributes is NULL, the console screen buffer gets a default security descriptor.

Windows 95: The lpSecurityDescriptor member of the structure is ignored.

dwFlags

Specifies the type of console screen buffer to create. The only currently supported screen buffer type is CONSOLE_TEXTMODE_BUFFER.

lpScreenBufferData

Reserved for possible future use; should be NULL.

Return Values

If the function succeeds, the return value is a handle to the new console screen buffer.

If the function fails, the return value is INVALID_HANDLE_VALUE. To get extended error information, call GetLastError.

Remarks

A console can have multiple screen buffers but only one active screen buffer. Inactive screen buffers can be accessed for reading and writing, but only the active screen buffer is displayed. To make the new screen buffer the active screen buffer, use the SetConsoleActiveScreenBuffer function.

The calling process can use the returned handle in any function that requires a handle of a console screen buffer, subject to the limitations of access specified by the dwDesiredAccess parameter.

The calling process can use the DuplicateHandle function to create a duplicate screen buffer handle that has different access or inheritability from the original handle. However, DuplicateHandle cannot be used to create a duplicate that is valid for a different process (except through inheritance).

To close the screen buffer handle, use the CloseHandle function.

See Also

CloseHandle, DuplicateHandle, GetConsoleScreenBufferInfo, SECURITY_ATTRIBUTES, SetConsoleActiveScreenBuffer, SetConsoleScreenBufferSize

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