Question

我一直在尝试使用Webbrowser控件以表格形式显示文件，并且在显示pdf时取得了一些成功，但是，如果我要显示TIFF文件，它想下载图片而不是显示图片。

我想我要问的问题是Web浏览器控件是否可以显示TIFF文件。有解决方法吗？

欢呼

Eych

Answer 1

您可能需要像csXImage这样的更高级的图片控件才能显示TIFF图片。

您可以使用本文中的 DownloadFile 函数下载该文件：

Show pictures directly from URLs in Access forms and reports

，以及在 GitHub 上：VBA.PictureUrl

Option Compare Database
Option Explicit

' API declarations.
'
Private Declare Function URLDownloadToFile Lib "Urlmon" Alias "URLDownloadToFileA" ( _
    ByVal pCaller As Long, _
    ByVal szURL As String, _
    ByVal szFileName As String, _
    ByVal dwReserved As Long, _
    ByVal lpfnCB As Long) _
    As Long

' Download a file or a page with public access from the web. 
' Returns 0 if success, error code if not. 
' 
' If parameter NoOverwrite is True, no download will be attempted 
' if an existing local file exists, thus this will not be overwritten. 
' 
' Examples: 
' 
' Download a file: 
'   Url = "https://www.codeproject.com/script/Membership/ProfileImages/%7Ba82bcf77-ba9f-4ec3-bbb3-1d9ce15cae23%7D.jpg" 
'   FileName = "C:\Test\CodeProjectProfile.jpg" 
'   Result = DownloadFile(Url, FileName) 
' 
' Download a page: 
'   Url = "https://www.codeproject.com/Tips/1022704/Rounding-Values-Up-Down-By-Or-To-Significant-Figur?display=Print" 
'   FileName = "C:\Test\CodeProject1022704.html" 
'   Result = DownloadFile(Url, FileName) 
' 
' Error codes: 
' -2146697210   "file not found". 
' -2146697211   "domain not found". 
' -1            "local file could not be created." 
' 
' 2004-12-17. Gustav Brock, Cactus Data ApS, CPH. 
' 2017-05-25. Gustav Brock, Cactus Data ApS, CPH. Added check for local file. 
' 2017-06-05. Gustav Brock, Cactus Data ApS, CPH. Added option to no overwrite the local file. 
' 
Public Function DownloadFile( _ 
    ByVal Url As String, _ 
    ByVal LocalFileName As String, _ 
    Optional ByVal NoOverwrite As Boolean) _ 
    As Long 

    Const BindFDefault  As Long = 0 
    Const ErrorNone     As Long = 0 
    Const ErrorNotFound As Long = -1

    Dim Result  As Long

    If NoOverwrite = True Then 
        ' Page or file should not be overwritten. 
        ' Check that the local file exists. 
        If Dir(LocalFileName, vbNormal) <> "" Then 
            ' File exists. Don't proceed. 
            Exit Function 
        End If 
    End If     

    ' Download file or page. 
    ' Return success or error code. 
    Result = URLDownloadToFile(0, Url & vbNullChar, LocalFileName & vbNullChar, BindFDefault, 0)   

    If Result = ErrorNone Then 
        ' Page or file was retrieved. 
        ' Check that the local file exists. 
        If Dir(LocalFileName, vbNormal) = "" Then 
            Result = ErrorNotFound 
        End If 
    End If   

    DownloadFile = Result 

End Function

MS ACCESS Webbrowser控制文件预览无法正常工作

1 个答案: