So, we have our chars for the whole path, including the file name, the extension, and the NUL terminator. Hi Gundage Vishal ,. Please refer to the link below about why does the character path length limit exist in Windows to get more information.
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I am proposing previous helpful replies as "Answered". If the reply is helpful, please remember to mark it as answer which can help other community members who have same questions and find the helpful reply quickly. Best regards, Carl. Seriously, generally speaking it is characters, but that comes with caveats. In real-world, common usage, the max is Here is why:. The maximum Windows filename length to the operating system is characters, however that includes a number of required characters that lower the effective number.
So, that takes the down to characters as an absolute maximum. That would be the case only if you had a very long filename with no extension and it was located on the root folder of the disk. Looking at more common and realistic scenarios, your effective maximum is going to be significantly lower. Add an extension very common , and your maximum length drops to or characters, depending on the length of the extension most are 3 characters; some are 4 - e.
Each directory name in the path of the filename must be included in that characters. This is why errors sometimes occur when moving files between directories. Users are often confused by the "filename too long" message when they see a short filename.
The reason for the error is the total path length must conform to the filename maximum length. Windows makes no distinction in filename storage between the path and filenames. They are stored in the same space. This is true even if a long file name contains extended characters, regardless of the code page that is active during a disk read or write operation. Files using long file names can be copied between NTFS file system partitions and Windows FAT file system partitions without losing any file name information.
In this case, the short file name is substituted if possible. The path to a specified file consists of one or more components , separated by a special character a backslash , with each component usually being a directory name or file name, but with some notable exceptions discussed below.
It is often critical to the system's interpretation of a path what the beginning, or prefix , of the path looks like. This prefix determines the namespace the path is using, and additionally what special characters are used in which position within the path, including the last character.
Each component of a path will also be constrained by the maximum length specified for a particular file system. In general, these rules fall into two categories: short and long.
Note that directory names are stored by the file system as a special type of file, but naming rules for files also apply to directory names. To summarize, a path is simply the string representation of the hierarchy between all of the directories that exist for a particular file or directory name.
For Windows API functions that manipulate files, file names can often be relative to the current directory, while some APIs require a fully qualified path. A file name is relative to the current directory if it does not begin with one of the following:.
If a file name begins with only a disk designator but not the backslash after the colon, it is interpreted as a relative path to the current directory on the drive with the specified letter. Note that the current directory may or may not be the root directory depending on what it was set to during the most recent "change directory" operation on that disk. Examples of this format are as follows:. A path is also said to be relative if it contains "double-dots"; that is, two periods together in one component of the path.
This special specifier is used to denote the directory above the current directory, otherwise known as the "parent directory". Relative paths can combine both example types, for example "C This is useful because, although the system keeps track of the current drive along with the current directory of that drive, it also keeps track of the current directories in each of the different drive letters if your system has more than one , regardless of which drive designator is set as the current drive.
In later versions of Windows, changing a registry key or using the Group Policy tool is required to remove the limit. See Maximum Path Length Limitation for full details. There are two main categories of namespace conventions used in the Windows APIs, commonly referred to as NT namespaces and the Win32 namespaces.
The NT namespace was designed to be the lowest level namespace on which other subsystems and namespaces could exist, including the Win32 subsystem and, by extension, the Win32 namespaces. Early versions of Windows also defined several predefined, or reserved, names for certain special devices such as communications serial and parallel ports and the default display console as part of what is now called the NT device namespace, and are still supported in current versions of Windows for backward compatibility.
The Win32 namespace prefixing and conventions are summarized in this section and the following section, with descriptions of how they are used.
Note that these examples are intended for use with the Windows API functions and do not all necessarily work with Windows shell applications such as Windows Explorer.
For this reason there is a wider range of possible paths than is usually available from Windows shell applications, and Windows applications that take advantage of this can be developed using these namespace conventions.
For more information about the normal maximum path limitation, see the previous section Maximum Path Length Limitation. This is how access to physical disks and volumes is accomplished directly, without going through the file system, if the API supports this type of access. You can access many devices other than disks this way using the CreateFile and DefineDosDevice functions, for example.
For example, if you want to open the system's serial communications port 1, you can use "COM1" in the call to the CreateFile function. Add a comment. Active Oldest Votes.
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