PB-WebDAV

Memory-optimal WebDAV client library for PowerBuilder 2019 R3, built on .NET Framework 4.8 with System.IO.Pipelines.
Exposes a COM dual interface so it works as both a direct .NET assembly reference and an OLE COM object.

다른 언어로 읽기: 한국어

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Purpose

PowerBuilder 2019 R3 has no built-in WebDAV support.
This library fills the gap by providing:

• File upload / download — streamed through System.IO.Pipelines (zero-copy, pool-backed, no large intermediate buffers)
• Directory listing — PROPFIND Depth:1 with full property parsing (displayname, contentlength, lastmodified, etag, creationdate, …)
• Resource management — DELETE, MKCOL, COPY, MOVE, HEAD (existence check)
• Authentication — Basic credentials + optional HTTP proxy
• COM interop — Dual interface (IDispatch + vtable) so PB OLEObject works directly

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Information

Target Framework

Item	Value
Framework	.NET Framework 4.8
Runtime download	.NET Framework 4.8
Required OS	Windows 7 SP1 / Windows Server 2008 R2 SP1 or later
PowerBuilder	PB 2019 R3 (direct .NET assembly) or any COM-capable PB version

Key Dependencies

Package	Purpose
System.IO.Pipelines 10.0.7	Pool-backed segment I/O
System.Memory 4.6.3	Span<T> / Memory<T> back-port
System.Buffers 4.6.1	ArrayPool<T>
System.Net.Http (in-box)	HttpClient for all WebDAV verbs

The release DLL is ILRepacked into a single self-contained PBWebDAV.dll — no extra files to deploy.

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PowerBuilder Usage

Option 1 — Direct .NET Assembly (Recommended for PB 2019 R3)

1. In PowerBuilder IDE → System Options → .NET Assembly → add PBWebDAV.dll
2. In code:

PBWebDAV.WebDavClient     oClient
long                      nCount, i

oClient = CREATE PBWebDAV.WebDavClient
oClient.Initialize("https://dav.example.com/files/", "alice", "s3cr3t")

nCount = oClient.ListDirectory("/documents/")
FOR i = 1 TO nCount - 1   // index 0 is the collection itself
    MessageBox("Item", oClient.GetItemDisplayName(i) + " / " + &
               String(oClient.GetItemContentLength(i)) + " bytes")
NEXT

oClient.DownloadFile("/documents/report.pdf", "C:\Temp\report.pdf")
oClient.UploadFile("C:\Temp\data.xlsx", "/documents/data.xlsx")

DESTROY oClient

Option 2 — COM / OLEObject (Fallback)

Register the DLL first (run as Administrator):

:: 32-bit PowerBuilder 2019 R3
%WINDIR%\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe PBWebDAV.dll /tlb /codebase

:: 64-bit host
%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe PBWebDAV.dll /tlb /codebase

Then in PowerBuilder:

OLEObject oClient
oClient = CREATE OLEObject
oClient.ConnectToNewObject("PBWebDAV.WebDavClient")

oClient.Initialize("https://dav.example.com/files/", "alice", "s3cr3t")

long nCount
nCount = oClient.ListDirectory("/documents/")

IF nCount < 0 THEN
    MessageBox("Error", oClient.GetLastError())
END IF

DESTROY oClient

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API Quick Reference

IWebDavClient

Method	Description
Initialize(url, user, pass)	Connect (anonymous if user/pass empty)
InitializeWithProxy(url, user, pass, proxyUrl, proxyUser, proxyPass)	Connect via HTTP proxy
SetTimeout(seconds)	Override 30 s default
ListDirectory(path) → int	PROPFIND Depth:1; returns item count, –1 on error
GetItemCount() → int	Count from last ListDirectory
GetItemHref(index) → string	Href of item at index (0 = collection)
GetItemDisplayName(index) → string	Display name of item at index
GetItemIsCollection(index) → bool	True when item is a directory
GetItemContentLength(index) → long	File size in bytes
GetItemContentType(index) → string	MIME type
GetItemLastModified(index) → string	RFC 1123 last-modified date
GetItemETag(index) → string	ETag value
GetItemCreationDate(index) → string	ISO 8601 creation date
GetItemStatusCode(index) → int	HTTP status of this propstat entry
DownloadFile(remote, local) → bool	GET → local file via pipeline
UploadFile(local, remote) → bool	local file → PUT via pipeline
DeleteItem(path) → bool	HTTP DELETE
CreateDirectory(path) → bool	HTTP MKCOL
CopyItem(src, dst, overwrite) → bool	Server-side COPY
MoveItem(src, dst, overwrite) → bool	Server-side MOVE
ItemExists(path) → bool	HEAD check
GetLastError() → string	Human-readable error from last call
GetLastStatusCode() → int	HTTP status from last call

Note: IWebDavItem and WebDavItem are internal implementation details — not exposed to COM or PowerBuilder. Use the GetItemXxx(index) methods above to access item properties; they return COM-safe primitives only.

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Build Information

Requirements: Windows with .NET SDK (any modern version — SDK-style csproj with net48 TFM).

# Restore & build
dotnet restore PB-WebDAV.csproj
dotnet build   PB-WebDAV.csproj -c Release

# Output: bin\Release\net48\PBWebDAV.dll

CI/CD commands are in .github/workflows/.

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Troubleshooting & Logging

When something goes wrong (e.g., connection issues, authentication failures, Server-Side logic errors), you don't need to check PB application event viewers or Windows AD events.

The library automatically generates daily log files tracking all requests, errors, and system warnings in the following location:

• C:\Temp\pb-webdav-dll.yyyy-MM-dd.log (e.g. C:\Temp\pb-webdav-dll.2026-04-25.log)

Whenever you need technical support or want to investigate an issue, simply check or attach this file.

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License

MIT License — Copyright (c) 2026 김유석(Yu Seok Kim)
See LICENSE for details.