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GetStillHDIB Method

Summary

Gets a device independent bitmap (DIB) during a CaptureMode.Still capture.

Syntax

C++/CLI

public virtual IntPtr GetStillHDIB( 
   int timeOut 
)

public:  
   virtual System::IntPtr GetStillHDIB( 
      Int32 timeOut 
   )

Parameters

timeOut
A value containing the maximum time to wait for the image, in milliseconds.

Return Value

System.IntPtr

Remarks

If the method succeeds, the caller must free the returned HDIB by calling the GlobalFree method. If TimeOut is -1, the method's time-out interval never elapses. If the method fails, an error is raised. For more information, refer to the Error Codes.

Note: The frame data is retrieved from the underlying graph after the processing filters. If the capture needs to occur before processing is completed, use the LeadVideoCallBackFilter and place it first in the collection of processing filters.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void GetStillDIBExample() 
{ 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   try 
   { 
      // set the video capture device. use your device's name here 
      if (capturectrl.VideoDevices["Logitech"] == null) 
         throw new Exception("No Logitech video device available"); 
 
      capturectrl.VideoDevices["Logitech"].Selected = true; 
 
      // set the capture mode to still and start 
      capturectrl.StartCapture(CaptureMode.Still); 
 
      // capture device independent bitmap 
      IntPtr dib = capturectrl.GetStillHDIB(-1); 
 
      // stop the capture 
      capturectrl.StopCapture(); 
 
      _result = (dib != null); 
 
      //free allocated global memory 
      Marshal.FreeHGlobal(dib); 
   } 
   catch (COMException) 
   { 
      _result = false; 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
}

Requirements

Target Platforms