DDR爱好者之家 Design By 杰米

本文实例讲述了ASP.NET创建动态缩略图的方法。分享给大家供大家参考。具体分析如下:

提示:

1. 导入 System.IO
2. 创建 类C lass "CreateThumbnails"
or any class and place following function inside that class

You need one function to response call back to main function

Function ImageAbortDummyCallback() As Boolean
Return False
End Function

具体代码如下:

Function CreateJPEGThumbnail(ByVal inSourceFile As String, ByVal inDestinationFile As String, ByVal ThumbWidth As Integer, ByVal ThumbHeight As Integer) As Boolean
  Dim imageFile As System.Drawing.Image
  Dim outputFstream As New FileStream(inSourceFile, FileMode.Open, FileAccess.Read) 
  'Exposes a System.IO.Stream around a file, supporting both synchronous and asynchronous read and write operations.
  Dim ImageAbortCallBack As System.Drawing.Image.GetThumbnailImageAbort 
  'This method returns true if it decides that the System.Drawing.Image.GetThumbnailImage method should prematurely stop execution; otherwise, it returns false.
  imageFile = System.Drawing.Image.FromStream(outputFstream)
  ImageAbortCallBack = New System.Drawing.Image.GetThumbnailImageAbort(AddressOf ImageAbortDummyCallback)
  imageFile = imageFile.GetThumbnailImage(ThumbWidth, ThumbHeight, ImageAbortCallBack, IntPtr.Zero) 
  'IntPtr = A platform-specific type that is used to represent a pointer or a handle.
  imageFile.Save(inDestinationFile, System.Drawing.Imaging.ImageFormat.Jpeg)
  outputFstream.Close()
  outputFstream = Nothing
  imageFile = Nothing
End Function

希望本文所述对大家的asp.net程序设计有所帮助。

DDR爱好者之家 Design By 杰米
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DDR爱好者之家 Design By 杰米

RTX 5090要首发 性能要翻倍!三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB,每个模块容量为2GB。其速度预设为32 Gbps(PAM3),但也可以降至28 Gbps,以提高产量和初始阶段的整体性能和成本效益。

据三星表示,GDDR7内存的能效将提高20%,同时工作电压仅为1.1V,低于标准的1.2V。通过采用更新的封装材料和优化的电路设计,使得在高速运行时的发热量降低,GDDR7的热阻比GDDR6降低了70%。