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Miscellaneous Low-Level Client Support

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This topic contains information about low-level APIs that are used by the Windows client infrastructure.

Functions

Topic Contents
_lclose The _lclose function closes the specified file so that it is no longer available for reading or writing. This function is provided for compatibility with 16-bit versions of Windows. Win32-based applications should use the CloseHandle function.
_lopen The _lopen function opens an existing file and sets the file pointer to the beginning of the file. This function is provided for compatibility with 16-bit versions of Windows. Win32-based applications should use the CreateFile function.
_lread The _lread function reads data from the specified file. This function is provided for compatibility with 16-bit versions of Windows. Win32-based applications should use the ReadFile function.
AreDvdCodecsEnabled Returns a value indicating whether DVD codecs are enabled on the current device.
DisableProcessWindowsGhosting Disables the window ghosting feature for the calling GUI process. Window ghosting is a Windows Manager feature that lets the user minimize, move, or close the main window of an application that is not responding.
GetMediaComponentPackageInfo Returns a list of properties for all media codecs installed on the system that meet the specified requirements.
GetMediaExtensionCommunicationFactory Creates a communication factory for registering a media extension.
InstantiateComponentFromPackage Creates an instance of a class in an application package.
IsMediaBehaviorEnabled Gets a value indicating whether the media behavior associated with the specified GUID is enabled.
NtClose Deprecated. This function is used to close the specified handle. NtClose is superseded by CloseHandle.
NtDeviceIoControlFile Deprecated. Builds descriptors for the supplied buffer(s) and passes the untyped data to the device driver associated with the file handle. NtDeviceIoControlFile is superseded by DeviceIoControl.
NtWaitForSingleObject Deprecated. Waits until the specified object attains a state of signaled. NtWaitForSingleObject is superseded by WaitForSingleObject.
RtlAnsiStringToUnicodeString Converts the specified ANSI source string into a Unicode string.
RtlCharToInteger Converts a character string to an integer.
RtlFormatCurrentUserKeyPath Initializes the supplied buffer with a string representation of the SID for the current user.
RtlFreeAnsiString Frees the string buffer allocated by RtlUnicodeStringToAnsiString.
RtlFreeOemString Frees the string buffer allocated by RtlUnicodeStringToOemString.
RtlFreeUnicodeString Frees the string buffer allocated by RtlAnsiStringToUnicodeString or by RtlUpcaseUnicodeString.
RtlInitString Initializes a counted string.
RtlInitUnicodeString Initializes a counted Unicode string.
RtlUnicodeStringToAnsiString Converts the specified Unicode source string into an ANSI string.
RtlUnicodeStringToOemString This functions converts the specified Unicode source string into an OEM string. The translation is done with respect to the OEM code page (OCP).
RtlUnicodeToMultiByteSize Determines how many bytes are needed to represent a Unicode string as an ANSI string.
RtlUnicodeToUTF8N The RtlUnicodeToUTF8N function translates the specified Unicode string into a new character string, using the 8-bit Unicode Transformation Format (UTF-8) code page.
RtlUTF8ToUnicodeN The RtlUTF8ToUnicodeN function translates the specified source string into a Unicode string, using the UTF-8 code page.
SendIMEMessageEx Specifies an action or processing for the Input Method Editor (IME) through a specified subfunction. Note: This function is obsolete and should not be used.
WINNLSEnableIME Temporarily enables or disables an IME and, at the same time, turns on or off the display of all windows owned by the IME. Note: This function is obsolete and should not be used.

 

Structures

Topic Contents
IMESTRUCT Used by SendIMEMessageEx to specify the subfunction to be executed in the IME message and its parameters. This structure is also used to receive return values from those subfunctions.
STRING This structure is used with the RtlUnicodeStringToOemString function.

 

Compiler Routines

Topic Contents
__C_specific_handler Routine __C_specific_handler is a helper routine for the C compiler.
_alldiv Routine _alldiv Routine is a helper routine for the C compiler.
_allmul Multiplies two LONGLONG or ULONGLONG.
_aulldiv Divides two ULONGLONG integers.
_chkstk Routine _chkstk Routine is a helper routine for the C compiler.