Windows api file functions

Using the Windows API, you can develop applications that run successfully on all versions of Windows while taking advantage of the features and capabilities unique to each version. Note that this was formerly called the Win32 API. The Windows UI API create and use windows to display output, prompt for user input, and carry out the other tasks that support interaction with the user. Most applications create at least one window.

Globalization Services. Windows Animation Manager. Windows Ribbon Framework. Legacy User Interaction. Directory Management.

If declared as Public, any form or module in your VB application can use the function; if Private, only the form or module in which it is declared can use the function. Declare any variables and constants necessary to be used as parameters with the sub or function. Call the sub or function as you would any other sub or function. Be advised that there are some differences between calling API functions versus regular VB subs and functions. Most notably, when dealing with strings, the keyword "ByVal" must be used when you really want to pass it by reference to get a return value back.

Click the Add button. The declaration should appear in the Selected Items area. Under "Declare Scope", choose Private. Click the Copy button. Close the utility. Open your code window, and paste the declaration under the Option Explicit line: If desired, "fix up" the declaration to break it into several lines for readability.

Also, declare a private variable called mlngOnOrOff long. When you click the "Try It" button, the title bar of the form should blink on and off. GetTempPathW Retrieves the path of the directory designated for temporary files. GetVolumeInformationA Retrieves information about the file system and volume associated with the specified root directory. GetVolumeInformationByHandleW Retrieves information about the file system and volume associated with the specified file. GetVolumeInformationW Retrieves information about the file system and volume associated with the specified root directory.

LockFile Locks the specified file for exclusive access by the calling process. LockFileEx Locks the specified file for exclusive access by the calling process.

This function can operate either synchronously or asynchronously and can request either an exclusive or a shared lock. Reads occur at the position specified by the file pointer if supported by the device.

It reports its completion status asynchronously, calling the specified completion routine when reading is completed or canceled and the calling thread is in an alertable wait state. ReadFileScatter Reads data from a file and stores it in an array of buffers. RemoveDirectoryA Deletes an existing empty directory. RemoveDirectoryW Deletes an existing empty directory. SetEndOfFile Sets the physical file size for the specified file to the current position of the file pointer. SetFileAttributesA Sets the attributes for a file or directory.

SetFileAttributesW Sets the attributes for a file or directory. SetFilePointer Moves the file pointer of the specified file. SetFilePointerEx Moves the file pointer of the specified file. Use the GetSystemDirectory function to get the path of this directory.

Use the GetWindowsDirectory function to get the path of this directory. Use the SearchPath function to search for a file. File Management Functions. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. OpenFile function winbase.

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