CodecsFilterHeartbeatEventArgs Class (original) (raw)
Syntax
public class CodecsFilterHeartbeatEventArgs : EventArgs public:
ref class CodecsFilterHeartbeatEventArgs : EventArgs
class CodecsFilterHeartbeatEventArgs(EventArgs): Example
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
// Call this method with a very large and complex XLSX document and a timeout in seconds value
// Returns true on success and false if aborted
// For each page, the image is loaded and passed to the processImage action
public bool FilterHeartbeatExample(string inputFileName, int timeoutSeconds, Action<RasterImage, int> processImage)
{
using (var rasterCodecs = new RasterCodecs())
{
// This is the start time, we will reset this value
// anytime we start an operation
DateTime startOperationTime = DateTime.Now;
// Create a heartbeat handler
EventHandler<CodecsFilterHeartbeatEventArgs> heartbeatHandler = (sender, e) =>
{
// Abort if it has been more than timeoutSeconds since last operation
TimeSpan timeSpan = DateTime.Now - startOperationTime;
if (timeSpan.TotalSeconds > timeoutSeconds)
{
e.Abort = true;
}
};
// Install the heartbeat handler
rasterCodecs.FilterHeartbeat += heartbeatHandler;
// First, get information on the file to get the number of pages
RasterImageFormat format;
int pageCount = 0;
// Reset the start time
startOperationTime = DateTime.Now;
using (CodecsImageInfo imageInfo = rasterCodecs.GetInformation(inputFileName, true))
{
// If GetInformationt took more than timeoutSeconds then we aborted the operation
// inside heartbeatHandler and GetInformation will return RasterImageFormat.Unknown
format = imageInfo.Format;
if (format != RasterImageFormat.Unknown)
pageCount = imageInfo.TotalPages;
}
// Did we abort?
if (format == RasterImageFormat.Unknown)
{
// Yes, fail
rasterCodecs.FilterHeartbeat -= heartbeatHandler;
return false;
}
// Now load all the pages
for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++)
{
// Reset the start time
startOperationTime = DateTime.Now;
RasterImage image = rasterCodecs.Load(inputFileName, pageNumber);
// If Load took more than timeoutSeconds then we aborted the operation
// inside heartbeatHandler and Load will return null
// Did we abort?
if (image == null)
{
// Yes, fail
rasterCodecs.FilterHeartbeat -= heartbeatHandler;
return false;
}
// Process the image and then delete it
processImage(image, pageNumber);
image.Dispose();
}
rasterCodecs.FilterHeartbeat -= heartbeatHandler;
// We successfully loaded and processed all the pages from the file
return true;
}
}
Leadtools.Codecs Assembly
CompactFile(Stream,Stream,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(Stream,Stream,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method
CompactFile(string,string,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(string,string,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method