Using Win32 functions in Visual FoxPro Image Gallery
File Management
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CopyFile
CopyFileTransacted
CreateDirectory
CreateFile
CreateFileTransacted
CreateHardLink
CreateSymbolicLink
DeleteFile
DeleteFileTransacted
FindClose
FindCloseChangeNotification
FindFirstChangeNotification
FindFirstFile
FindNextChangeNotification
FindNextFile
FlushFileBuffers
GetBinaryType
GetCurrentDirectory
GetDriveType
GetFileAttributes
GetFileAttributesEx
GetFileInformationByHandle
GetFileType
GetFullPathName
GetLongPathName
GetShortPathName
GetTempFileName
GetTempPath
LockFile
MoveFile
MoveFileTransacted
OpenFile
QueryDosDevice
ReadDirectoryChangesW
ReadFile
RemoveDirectory
RemoveDirectoryTransacted
ReplaceFile
SearchPath
SetCurrentDirectory
SetEndOfFile
SetFileAttributes
SetFilePointer
SetFilePointerEx
SetSearchPathMode
UnlockFile
WriteFile
_lclose
_lopen
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Using InternetSetFilePointer when resuming interrupted download from the Internet

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Before you begin:
The remote source file, presented in this example, is large enough -- 3465231 bytes.

When running this code try to interrupt it completely by pushing the Esc key, and starting the program again one or more times to complete the download. Clear memory or even quit VFP between the calls.
 
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4232 bytes  
Created: 2001-11-13 19:11:14  
Modified: 2011-12-10 09:20:22  
Visits in 7 days: 165  
Listed functions:
CloseHandle
CreateFile
GetFileSize
InternetCloseHandle
InternetOpen
InternetOpenUrl
InternetReadFile
InternetSetFilePointer
OpenFile
SetFilePointer
WriteFile
Printer friendly API declarations
My comment:
If the target local file is found, the program opens the source remote file and sets its pointer equally to the local file size. The local pointer is set to EOF position.

The InternetSetFilePointer parameters include pReserved parameters, which MSDN suggests to set to zero. After comparing interfaces of InternetSetFilePointer and SetFilePointer it is quite logical to say that this parameter is similar to the lpDistanceToMoveHigh (high DWORD).

The simplest way to check this assumption is to download in N-steps a remote file larger than 0xffffffff (4,294,967,295) bytes -- 4 Gb. And at least one interruption should be made after the critical DWORD length offset.
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