我正在开发一个用于生成QR码的VBA类，但在将QR数据位写入实际的BMP文件时遇到了难题。为了掌握BMP结构和代码，我一直试图使用下面的代码创建一个全白的21 x 21像素位图。这几乎可以正常工作，除了每行最左边的列是黄色而不是白色。有什么想法吗？我猜测我的头文件定义可能有问题，但我不确定。我对BMP毫无经验。我的代码基于http://answers.microsoft.com/en-us/office/forum/office_2007-customize/how-can-i-create-a-bitmap-image-with-vba/4976480a-d20b-4b2a-8ecc-436428d9586b找到的内容。
Private Type typHEADER
strType As String * 2 ' Signature of file = "BM"
lngSize As Long ' File size
intRes1 As Integer ' reserved = 0
intRes2 As Integer ' reserved = 0
lngOffset As Long ' offset to the bitmap data (bits)
End Type
Private Type typINFOHEADER
lngSize As Long ' Size
lngWidth As Long ' Height
lngHeight As Long ' Length
intPlanes As Integer ' Number of image planes in file
intBits As Integer ' Number of bits per pixel
lngCompression As Long ' Compression type (set to zero)
lngImageSize As Long ' Image size (bytes, set to zero)
lngxResolution As Long ' Device resolution (set to zero)
lngyResolution As Long ' Device resolution (set to zero)
lngColorCount As Long ' Number of colors (set to zero for 24 bits)
lngImportantColors As Long ' "Important" colors (set to zero)
End Type
Private Type typPIXEL
bytB As Byte ' Blue
bytG As Byte ' Green
bytR As Byte ' Red
End Type
Private Type typBITMAPFILE
bmfh As typHEADER
bmfi As typINFOHEADER
bmbits() As Byte
End Type
'==================================================
Public Sub makeBMP(intQR() As Integer)
Dim bmpFile As typBITMAPFILE
Dim lngRowSize As Long
Dim lngPixelArraySize As Long
Dim lngFileSize As Long
Dim j, k, l, x As Integer
Dim bytRed, bytGreen, bytBlue As Integer
Dim lngRGBColoer() As Long
Dim strBMP As String
With bmpFile
With .bmfh
.strType = "BM"
.lngSize = 0
.intRes1 = 0
.intRes2 = 0
.lngOffset = 54
End With
With .bmfi
.lngSize = 40
.lngWidth = 21
.lngHeight = 21
.intPlanes = 1
.intBits = 24
.lngCompression = 0
.lngImageSize = 0
.lngxResolution = 0
.lngyResolution = 0
.lngColorCount = 0
.lngImportantColors = 0
End With
lngRowSize = Round(.bmfi.intBits * .bmfi.lngWidth / 32) * 4
lngPixelArraySize = lngRowSize * .bmfi.lngHeight
ReDim .bmbits(lngPixelArraySize)
ReDim lngRGBColor(21, 21)
For j = 1 To 21 ' For each row, starting at the bottom and working up...
'each column starting at the left
For x = 1 To 21
k = k + 1
.bmbits(k) = 255
k = k + 1
.bmbits(k) = 255
k = k + 1
.bmbits(k) = 255
Next x
If (21 * .bmfi.intBits / 8 < lngRowSize) Then ' Add padding if required
For l = 21 * .bmfi.intBits / 8 + 1 To lngRowSize
k = k + 1
.bmbits(k) = 0
Next l
End If
Next j
.bmfh.lngSize = 14 + 40 + lngPixelArraySize
End With ' Defining bmpFile
strBMP = "C:\Desktop\Sample.BMP"
Open strBMP For Binary Access Write As 1 Len = 1
Put 1, 1, bmpFile.bmfh
Put 1, , bmpFile.bmfi
Put 1, , bmpFile.bmbits
Close
End Sub