在VBA中使用Base64将图像插入到工作表中?

问题描述：

我正在尝试使用Base64使用VBA将图像插入到工作表中，但是我找不到任何在任何地方正确执行此操作的示例.

I'm trying to insert an image into a sheet with VBA using Base64 but I can't find any examples of how to do it correctly anywhere.

我为图像设置了字符串，例如:

I have a string setup for the image, something like:

vLogo = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZoAAABfCAY"

我只想执行以下操作，而不是寻找图像文件，将图像存储在VBA中.

I just want to do the following, but instead of looking for an image file store the image in the VBA.

Sheets("Sheet1").Pictures.Insert (Application.ActiveWorkbook.Path & "\vLogo.png")

我什至考虑做类似的事情:

I've even looked at doing something like:

' Write the image to file
Dim myFile As String
myFile = Application.ActiveWorkbook.Path & "\temp.png"
Open myFile For Output As #1
Write #1, vLogo
Close #1

' Insert the image
Sheets("Sheet1").Pictures.Insert (Application.ActiveWorkbook.Path & "\temp.png")

' Delete the temp file
Kill Application.ActiveWorkbook.Path & "\temp.png"

但是我不知道如何将base64编码的图像写入文件.

But I can't figure out how to write the base64 encoded image to file.

答

MSXML库中有一个base64编码，可以在VBA中使用.网上出现了很多例子，其中核心功能不断出现:

There's a base64 encoding in the MSXML library which can be used in VBA. There are a bunch of examples knocking around the web where the core function keeps popping up:

蒂姆·黑斯廷斯(Tim Hastings)根据Wayback机器所做的事情(2005！)
堆栈溢出
Travis Hydzik的博客

Experts Exchange which references the next item
Something by a Tim Hastings according to Wayback machine (2005!)
Stack Overflow
Travis Hydzik's blog

我基本上已经提取了相同的代码，该代码接受一个字符串并返回一个base64字节数组，然后使用OP的临时文件方法将图像重新加载到工作表中.我整理了一下，使用了后期绑定加上一些测试.这些测试在Excel 2010上对我来说效果很好:

I've basically lifted the same code which takes a string and returns a base64 byte array then used the OP's temporary file approach to load the image back into the sheet. I've tidied a bit, used late binding plus put in some tests. The tests work well for me on Excel 2010:

测试问题中的base64字符串似乎不起作用:

Testing the base64 string in the question doesn't seem to work:

iVBORw0KGgoAAAANSUhEUgAAAZoAAABfCAY

赠予:

代码:

Option Explicit

Sub Test()

    Dim strTempPath As String
    Dim arrTest(1 To 3) As String
    Dim intCounter As Integer

    'base 64 image examples
    'red dot
    arrTest(1) = "iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="
    'little face logo
    arrTest(2) = "R0lGODlhDwAPAKECAAAAzMzM/////wAAACwAAAAADwAPAAACIISPeQHsrZ5ModrLlN48CXF8m2iQ3YmmKqVlRtW4MLwWACH+H09wdGltaXplZCBieSBVbGVhZCBTbWFydFNhdmVyIQAAOw=="
    'Stack Overflow logo
    arrTest(3) = GetSOLogoBase64

    'use workbook path as temp path
    strTempPath = Application.ActiveWorkbook.Path & "\temp.png"

    For intCounter = 1 To 3

        'save byte array to temp file
        Open strTempPath For Binary As #1
           Put #1, 1, DecodeBase64(arrTest(intCounter))
        Close #1

        'insert image from temp file
        Sheets("Sheet1").Cells(intCounter * 4, 1).Select
        Sheets("Sheet1").Pictures.Insert strTempPath

        'kill temp file
        Kill strTempPath

    Next intCounter

End Sub

Private Function DecodeBase64(ByVal strData As String) As Byte()

    Dim objXML As Object 'MSXML2.DOMDocument
    Dim objNode As Object 'MSXML2.IXMLDOMElement

    'get dom document
    Set objXML = CreateObject("MSXML2.DOMDocument")

    'create node with type of base 64 and decode
    Set objNode = objXML.createElement("b64")
    objNode.DataType = "bin.base64"
    objNode.Text = strData
    DecodeBase64 = objNode.nodeTypedValue

    'clean up
    Set objNode = Nothing
    Set objXML = Nothing

End Function

Function GetSOLogoBase64() As String

    GetSOLogoBase64 = ""
    GetSOLogoBase64 = GetSOLogoBase64 & "iVBORw0KGgoAAAANSUhEUgAAANAAAAA4CAMAAAC7bYapAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvq"
    GetSOLogoBase64 = GetSOLogoBase64 & "GQAAADJUExURSIkJi8wMi8xMzw+QD0/QUpMTktNTlhaW1lbXGZnaWdoanR1dnV2d4KDhIOEhZCRkpGSk56en56foKusraytrrm6u7q7u7y7u8"
    GetSOLogoBase64 = GetSOLogoBase64 & "TDw8fIyMjHx8jJyczLy83MzNXV1tnY2N3d3ePj4+bl5e7u7vHx8fLy8vSAJPSHMPSIMfWPPvWQP/aXTPaYTfafWvegW/enZ/eoaPivdfiwdvm"
    GetSOLogoBase64 = GetSOLogoBase64 & "3g/m4hPm/kfrAkvrHnvrIn/vPrPvQrfzXuvzYu/zfyP3gyf3n1f7v4//38f///4l4PkAAAATsSURBVGje7Zh5e5tGEIeXS4CQDArGKlVEQ7pF"
    GetSOLogoBase64 = GetSOLogoBase64 & "cn0kjq8qqiqJ7/+hOjO7LAgdsRWnjXjYPyxgl2HeOX67j1nesMFaoBaoBWqBWqAW6GcGWs+bBbS8zuZNAlpfZtl01aQMzbIsu25UD90B0X1Dg"
    GetSOLogoBase64 = GetSOLogoBase64 & "Nb05wqI5o0AmmczkoXJSbXRfqDlNMse8OL5pNqIHZSD7DOW3Se4eGxAyWGtZdcrod3ZogGisEI9mC4BDX/XDZDtNRYbSgO20e2rbQfBdzrHz4"
    GetSOLogoBase64 = GetSOLogoBase64 & "MgzOPgNYb2AC3l7z0SPRzZRuw7T76JyRizc5+9xtCepZfTp3VVGqiNlvVVYZD+SKAOezMgxJg+rSrSsMwms61lNot/IFAKIJYfvgkQnndgfFm"
    GetSOLogoBase64 = GetSOLogoBase64 & "V0jBf5v8xUAwgaP9NSm5xI5EWUhqudq16NVA6Gu1p/1H6IqDRiB+rckuZpdsFSsOkmp8LkJ3zlIDejdDFNOg6Z6qfLs6c7jteAvEgSOjiHJtc"
    GetSOLogoBase64 = GetSOLogoBase64 & "73EqJo/aHi4GxUTAhfd2hLc9jkAdp18CJV1sKgcgDZihJqbX89yF5+k3ZXslka6/5rNFTXvwiwjEmBahWRpn5D61MtOjAggekPN5Ty7rcHRAx"
    GetSOLogoBase64 = GetSOLogoBase64 & "0d9cqQygd7r4i6K2aYoJHKChfI9AjFxCmasF+1DjxNC+rOSH65rIcQ4NEIE8nwIvqXBNQ81jBa4b0c89vED5IfiiVgxHAoBZs1Eh/HGsA2RNZ"
    GetSOLogoBase64 = GetSOLogoBase64 & "8pr2tAXFcG0oQW5JwJO3jbPwA0//LXPwoJ9TqrHLYjkeRqD/FEznTQIVfccAEE+QxLEY5y7pEPGnkg/DJF/XkUdfTeSvkg3Ooh5PY4xcXD9z3"
    GetSOLogoBase64 = GetSOLogoBase64 & "xCO0MZHz2AdFuevvwVeRldpndVSZ98GqPKOB3Oyyt3kOZhOqOWDm1jUe1gq5ypOJqwi+7oQbkyXUuZk28j62Dv1D62iFRuMqKcfv0NyRnttrQ"
    GetSOLogoBase64 = GetSOLogoBase64 & "HocfAFK1TPfAY1Y0y8cLA38TimkH44zhDXDQgoqk1YDAayMvbjFPCYRAs9BOoTH7gB5vJlk5pp+fa1oN2tML4gpQfObggA/FEL0KkM4sQVEBs"
    GetSOLogoBase64 = GetSOLogoBase64 & "ukXsPopFaHqmm8D2QoIGQZA5UI4+jHZ2QX0fjz+Qyrc/P5GIX3K84/j8W/qwEMNjImSQD2m2Ti2gVjINVndNSBwxBxQpRwHBNXmQt2FEBSzX9"
    GetSOLogoBase64 = GetSOLogoBase64 & "15N4CGw+Hv1a1odkfVB6fSD8Ph+42NMLKg4AVQzCxelBzfBArRcycvthxfSqwvzjW66uhqix4AMssVoAe6jk1lkR33RUDizPB8t9wGyikXtvx"
    GetSOLogoBase64 = GetSOLogoBase64 & "gXPaQxnjtpGBJWSS9FiSh8K/UXGGAHwQq9h6HMpXS666IB1PKsxNo8VQbq11ACZh1N4BS/K4ne6Y8KSRMT4vdPEguOtIvklxDqoQOFtKu3Fh3"
    GetSOLogoBase64 = GetSOLogoBase64 & "AcViH+tcJIHMtCU5BBk/BPSY1caiCtRzUrnvo8Z2ybVucUQA+xr1Z9rpqaNPXxRdojqF9kBoLnluCdUEEO0AimV7WcUyDd0fFBz42MqPBuJQK"
    GetSOLogoBase64 = GetSOLogoBase64 & "t0g6OloBLzXHawe0wkcXSv2P9MhPVZnOW3TcVeE01M7jld46u3MkNhu/JxLIi0p4kOdMygCc2SGQOTQqkU2EtcAA7wPVaN5qSwx/D4ejNRpO2"
    GetSOLogoBase64 = GetSOLogoBase64 & "I6MaQerLPC0t9CQCJy2Y139xD4LJQxDwHJ8OS+a8jOScqt+EWiIMZ2D53EP0laoBMA+nW8c/xyskD7Rwv0EwB9ODQ+NuBfwac4WqAWqAVqgVq"
    GetSOLogoBase64 = GetSOLogoBase64 & "gFuj/HP8CZQ0/RA2L6ggAAAAASUVORK5CYII="

End Function

在VBA中使用Base64将图像插入到工作表中?

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