我可以从存储在数据库中的字节数组在服务器上创建一个图像。但是如何将每个字节数组合成一个图像。基本上我想将它们堆叠在一起（它们都是1366px宽度和618px高度），然后将其保存到png图像。然后，我将从服务器获取该图像并返回到网页（我现在可以为一个图像执行此操作）。希望你能帮忙。
asp.net web表单中的这段代码创建了一个图像，我将文件名作为webmethod函数的返回值返回给浏览器。
Public Shared Function Base64ToImage(ByVal base64String As String, ByVal id As String) As String
'http://www.dailycoding.com/Posts/convert_image_to_base64_string_and_base64_string_to_image.aspx
' Convert Base64 String to byte[]
Dim sFileName As String = String.Empty
Try
Dim imageBytes As Byte() = Convert.FromBase64String(base64String)
Dim ms As New MemoryStream(imageBytes, 0, imageBytes.Length)
' Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length)
Dim image__1 As Image = Image.FromStream(ms, True)
sFileName = "img_" & id & ".png"
Dim sPath As String = HttpContext.Current.Server.MapPath("images\")
image__1.Save(sPath & sFileName, System.Drawing.Imaging.ImageFormat.Png)
Catch ex As Exception
End Try
'
Return sFileName
End Function
我试过这个，循环遍历记录，然后尝试将它们与sourcecopy结合起来，但我无法将它们组合起来？
Public Shared Function Base64ToImage2(ByVal dt As DataTable) As String
' Convert Base64 String to byte[]
Dim sFileName As String = String.Empty
Dim base64String As String, id As String
'if first record create image
'on 2nd or greater in dt then combine images
Try
Dim iCount As Integer = 0
Dim image__1 As Image = Nothing
Dim compositeImage As Image = Nothing
Dim sPath As String = String.Empty
If dt.Rows.Count > 0 Then
For Each myRow As DataRow In dt.Rows
'getImage = getImage() & Base64ToImage(myRow("image_data").ToString(), myRow("id").ToString()) & "|"
If iCount = 0 Then
Dim imageBytes As Byte() = Convert.FromBase64String(myRow("image_data").ToString())
Dim ms As New MemoryStream(imageBytes, 0, imageBytes.Length)
' Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length)
image__1 = System.Drawing.Image.FromStream(ms)
'sFileName = "img_1.png"
'sPath = HttpContext.Current.Server.MapPath("images\")
'image__1.Save(sPath & sFileName, System.Drawing.Imaging.ImageFormat.Png)
'compositeImage = New Bitmap(image__1.Width, image__1.Height)
Else
Dim imageBytes As Byte() = Convert.FromBase64String(myRow("image_data").ToString())
Dim ms2 As New MemoryStream(imageBytes, 0, imageBytes.Length)
' Convert byte[] to Image
ms2.Write(imageBytes, 0, imageBytes.Length)
Dim image__2 As Image = System.Drawing.Image.FromStream(ms2)
Dim g As Graphics = Graphics.FromImage(image__1)
g.CompositingMode = CompositingMode.SourceCopy
g.DrawImage(image__2, 0, image__1.Height)
sFileName = "img_1.png"
'sPath = HttpContext.Current.Server.MapPath("images\")
'image__2.Save(sPath & sFileName, System.Drawing.Imaging.ImageFormat.Png)
End If
iCount = iCount + 1
Next myRow
End If
'sFileName = "img_1.png"
'Dim sPath As String = HttpContext.Current.Server.MapPath("images\")
'compositeImage.Save(sPath & sFileName, System.Drawing.Imaging.ImageFormat.Png)
Catch ex As Exception
End Try
'
Return sFileName
End Function
答案 0 :(得分：1)
解决！经过大量的搜索和阅读后，我能够将png图像合二为一！每个图像都是从内存流中创建的，然后使用NewRectangle作为关键字附加到位图。一旦我从数据库循环记录，我有一个图像，它在webmethod返回下载到客户端。宽度和高度从客户端拉到web方法并传递到函数中，因此缩放图像以适应浏览器内部尺寸（以避免任何滚动条）。
客户端上的JS维度： mywidth = window.innerWidth myheight = window.innerHeight
转换base64字节图像的代码如下......
Public Shared Function Base64ToImage2(ByVal dt As DataTable, ByVal Image_Width As String, ByVal Image_Height As String) As String
Dim sFileName As String = String.Empty
Dim sPath As String = HttpContext.Current.Server.MapPath("images\")
Dim myimage As Image = Nothing
' Create a new bitmap object 400 pixels wide by 60 pixels high
Dim objBitmap As New Bitmap(CInt(Image_Width), CInt(Image_Height))
'' Create a graphics object from the bitmap
Dim objGraphic As Graphics = Graphics.FromImage(objBitmap)
'if first record create image
'on 2nd or greater in dt then combine images
Try
If dt.Rows.Count > 0 Then
For Each myRow As DataRow In dt.Rows
Dim imageBytes As Byte() = Convert.FromBase64String(myRow("image_data").ToString())
Dim ms As New MemoryStream(imageBytes, 0, imageBytes.Length)
' Convert byte[] to Image
ms.Write(imageBytes, 0, imageBytes.Length)
myimage = System.Drawing.Image.FromStream(ms)
objGraphic.DrawImage(myimage, New Rectangle(0, 0, CInt(Image_Width), CInt(Image_Height)))
Next myRow
sFileName = "img_1.png"
objBitmap.Save(sPath & sFileName, System.Drawing.Imaging.ImageFormat.Png)
End If
Catch ex As Exception
End Try
'
Return sFileName
End Function
答案 1 :(得分：0)
如果其他人在C＃中寻找类似的内容，而您尝试使用结果加载图片来源，请输入以下代码：
private void LoadImage()
{
string src = string.empty;
byte[] mergedImageData = new byte[0];
mergedImageData = MergeTwoImageByteArrays(watermarkByteArray, backgroundImageByteArray);
src = "data:image/png;base64," + Convert.ToBase64String(mergedImageData);
MyImage.ImageUrl = src;
}
private byte[] MergeTwoImageByteArrays(byte[] imageBytes, byte[] imageBaseBytes)
{
byte[] mergedImageData = new byte[0];
using (var msBase = new MemoryStream(imageBaseBytes))
{
System.Drawing.Image imgBase = System.Drawing.Image.FromStream(msBase);
Graphics gBase = Graphics.FromImage(imgBase);
using (var msInfo = new MemoryStream(imageBytes))
{
System.Drawing.Image imgInfo = System.Drawing.Image.FromStream(msInfo);
Graphics gInfo = Graphics.FromImage(imgInfo);
gBase.DrawImage(imgInfo, new Point(0, 0));
//imgBase.Save(Server.MapPath("_____testImg.png"), ImageFormat.Png);
MemoryStream mergedImageStream = new MemoryStream();
imgBase.Save(mergedImageStream, ImageFormat.Png);
mergedImageData = mergedImageStream.ToArray();
mergedImageStream.Close();
}
}
return mergedImageData;
}