Bitmap.save() ----- A generic error occurred in GDI+ 问题解决方法
最近的一个项目中在处理数据绘制图表时，在进行bitmap.save()时偶尔遇到上述问题“ A generic error occurred in GDI+”。由于项目中代码量较大，这里只转载网络上解决文章中的VB代码。
原文链接地址：http://blog.vishalon.net/index.php/bitmapsave-a-generic-error-occurred-in-gdi+
1、原因：
This problem occurs because until the bitmap object is disposed, it creates a lock on the underlying image file. So you can save the newly generated file with different name but not overwrite the file because of lock.Now suppose you want to overwrite the file then create another bitmap from old bitmap. dispose the object of old bitmap, process new bitmap object and save the new bitmap object with original file name. The above chunk of code should be written in the following way.
2、源代码
Dim oBitmap As Bitmap
oBitmap = New Bitmap("c:\example.jpg")
Dim oGraphic As Graphics
oGraphic = Graphics.FromImage(oBitmap)
Dim oBrush As New SolidBrush(Color.Black)
Dim ofont As New Font("Arial", 8)
oGraphic.DrawString("Some text to write", ofont, oBrush, 10, 10)
oBitmap.Save("c:\example.jpg",ImageFormat.Jpeg)
oBitmap.Dispose()
oGraphic.Dispose()
3、处理后代码
Dim oBitmap As Bitmap oBitmap = New Bitmap("c:\example.jpg")
Dim oGraphic As Graphics
' Here create a new bitmap object of the same height and width of the image.
Dim bmpNew As Bitmap = New Bitmap(oBitmap.Width, oBitmap.Height)
oGraphic = Graphics.FromImage(bmpNew)
oGraphic.DrawImage(oBitmap, New Rectangle(0, 0, _ bmpNew.Width, bmpNew.Height), 0, 0, oBitmap.Width, _ oBitmap.Height, GraphicsUnit.Pixel)
' Release the lock on the image file. Of course,
' image from the image file is existing in Graphics object
oBitmap.Dispose()
oBitmap = bmpNew
Dim oBrush As New SolidBrush(Color.Black)
Dim ofont As New Font("Arial", 8)
oGraphic.DrawString("Some text to write", ofont, oBrush, 10, 10)
oGraphic.Dispose()
ofont.Dispose()
oBrush.Dispose()
oBitmap.Save("c:\example.jpg", ImageFormat.Jpeg)
oBitmap.Dispose()