我正在使用以下教程链接在我的 Web 项目中使用它，以便我可以在.swf扩展名中验证 Flash 文件的高度和宽度。
我上传闪存文件并检查所需的高度和高度，如果它不在所需的尺寸内，那么我必须删除文件并显示用户验证错误消息。
删除文件时，它会生成以下错误消息
The process cannot access the file 'C:\PROJECTS\xyz\images\banners\file.swf' because it is being used by another process.
我使用以下 Close & dispose 方法来释放对象，但它仍然会产生错误。我注意确定使用哪种方法来释放对象，以便如果文件不在所需的域中，我可以删除文件
示例代码
//Upload files
string path = Server.MapPath("../images/banners/") + fileName;
FileUploadBanner.PostedFile.SaveAs(path);
Session["bannerImage"] = fileName.ToString();
try
{
SwfReader swfReader = new SwfReader(path);
Swf swf = swfReader.ReadSwf();
int swfHeight = swf.Header.Height;
int swfWidth = swf.Header.Width;
swfReader.Close();
((IDisposable)swfReader).Dispose();
// ((IDisposable)swfReader).Dispose();
if ((swfHeight > int.Parse(hdnBannerHeight.Value)) || (swfWidth > int.Parse(hdnBannerWidth.Value)))
{
lblImageUploadMessage1.Text = "File cant be upload as it has invalid dimensions";
lblImageUploadMessage1.CssClass = "lblErrorMSG";
Session["bannerImage"] = null;
if (System.IO.File.Exists(path)) { System.IO.File.Delete(path); }
}
}
catch (Exception ex)
{ }
finally
{
//((IDisposable)swfReader).Dispose();
}
上传图片和flash文件的完整代码
try
{
lblImageUploadMessage1.Text = "";
String filePath = string.Empty;
String CurrentGUID = Guid.NewGuid().ToString();
string errMsg = string.Empty;
if (FileUploadBanner.HasFile)
{
string fileName = System.IO.Path.GetFileName(FileUploadBanner.FileName);
System.IO.FileInfo f = new System.IO.FileInfo(FileUploadBanner.PostedFile.FileName);
double fileSize = (double)FileUploadBanner.FileBytes.Length;
if (fileSize < 1024000) // 1 MB current size size in bytes 102400=100kb 512000 = 500kb
{
if ((f.Extension.ToLower() == ".jpg") || (f.Extension.ToLower() == ".png") || (f.Extension.ToLower() == ".gif") || (f.Extension.ToLower() == ".jpeg") || (f.Extension.ToLower() == ".swf"))
{
fileName = CurrentGUID + f.Extension;
string fExtension = f.Extension.ToString();
filePath = Server.MapPath("../images/banners/") + fileName;
if (System.IO.File.Exists(filePath))
{
return;
}
else
{
//Upload files
string path = Server.MapPath("../images/banners/") + fileName;
FileUploadBanner.PostedFile.SaveAs(path);
Session["bannerImage"] = fileName.ToString();
errMsg = "Banner Uploaded Successfully";
lblImageUploadMessage1.Text = errMsg;
lblImageUploadMessage1.CssClass = "lblMSG";
if (f.Extension.ToLower() != ".swf")
{
System.Drawing.Image imgInfo = System.Drawing.Image.FromFile(filePath);
int imgH = imgInfo.Height;
int imgW = imgInfo.Width;
imgInfo.Dispose();
//Check Dimension of image & delete image if height,width is greater than specified dimension
if ((imgH > int.Parse(hdnBannerHeight.Value)) || (imgW > int.Parse(hdnBannerWidth.Value)))
{
lblImageUploadMessage1.Text = "File cant be upload as it has invalid dimensions";
lblImageUploadMessage1.CssClass = "lblErrorMSG";
Session["bannerImage"] = null;
if (System.IO.File.Exists(path)) { System.IO.File.Delete(path); }
}
}
//If Flash object
else
{
try{
lblImageUploadMessage1.Text = "You cant upload flash banner";
lblImageUploadMessage1.CssClass = "lblErrorMSG";
/* Not using below case as i not able to dispose the swfReader object which can result in unnecessary memory*/
////// Create a swf stream reader
////SwfReader swfReader = new SwfReader(path);
////// Read the completed swf file
////Swf swf = swfReader.ReadSwf();
////// Read only headers of file to optimize read speed
//////Swf swf = swfReader.ReadSwfHeader();
////int swfHeight = swf.Header.Height;
////int swfWidth = swf.Header.Width;
////swfReader.Close();
////if ((swfHeight > int.Parse(hdnBannerHeight.Value)) || (swfWidth > int.Parse(hdnBannerWidth.Value)))
////{
//// lblImageUploadMessage1.Text = "File cant be upload as it has invalid dimensions";
//// lblImageUploadMessage1.CssClass = "lblErrorMSG";
//// Session["bannerImage"] = null;
//// if (System.IO.File.Exists(path)) { System.IO.File.Delete(path); }
////}
}
catch (Exception ex)
{
lblErrorMessages.Text = ex.Message.ToString();
}
finally
{
//((IDisposable)swfReader).Dispose();
}
}
}
return;
}
//client-side error
else
{
errMsg = "File must be an Image type of .jpg, .png, .gif, .jpeg, .swf";
lblImageUploadMessage1.Text = errMsg;
return;
}
}
else
{
errMsg = "File size is greater the 1MB";
//client-side error
lblImageUploadMessage1.Text = errMsg;
return;
}
}
else
{
errMsg = "Cant Upload File due to some error";
//client-side error
lblImageUploadMessage1.Text = errMsg;
return;
}
}
catch (Exception ex)
{
//Response.Write("ERROR MESSAGE : " + ex.Message.ToString());
lblErrorMessages.Text = "ERROR MESSAGE : " + ex.Message.ToString();
}
}