[gdal-dev] Problem with GDALDatasetRasterIO.cs and ECW files

[Francisco José Reyes Peralta]

Using the following code I only can read aproximately 500 x 500 pixels.
        Dim ecwDS As Dataset = Gdal.Open("C:\h10_1024_1-2.ecw", Access.GA_ReadOnly)        Dim banda As Band = ecwDS.GetRasterBand(1)        Dim bmp As Bitmap = New Bitmap(ecwDS.RasterXSize, ecwDS.RasterYSize, PixelFormat.Format8bppIndexed)        Dim bmpData As BitmapData = bmp.LockBits(New Rectangle(0, 0, ecwDS.RasterXSize, ecwDS.RasterYSize), ImageLockMode.ReadOnly, PixelFormat.Format8bppIndexed)        Try            Dim pal As ColorPalette = bmp.Palette            For i As Integer = 0 To 255                pal.Entries(i) = Color.FromArgb(255, i, i, i)            Next            bmp.Palette = pal
            Dim stride As Integer = bmpData.Stride            Dim buf As IntPtr = bmpData.Scan0
            banda.ReadRaster(0, 0, ecwDS.RasterXSize, ecwDS.RasterYSize, buf, ecwDS.RasterXSize, _             ecwDS.RasterYSize, DataType.GDT_Byte, 1, stride)        Finally            bmp.UnlockBits(bmpData)        End Try
        PictureBox1.Image = bmp
If I change the ecwDS.RasterXSize and ecwDS.RasterYSize to 500 pixels i can get the rasterband into my picturebox.
I obtain a memory exception. Not enough memory!

Date: Tue, 19 Apr 2011 16:10:27 +0200
Subject: Re: [gdal-dev] Problem with GDALDatasetRasterIO.cs and ECW files
From: szekerest at gmail.com
To: gistdt08 at hotmail.es
CC: gdal-dev at lists.osgeo.org

Not sure what is the actual value of 'pixelFormat__1' in your program.

Best regards,

Tamas


2011/4/19 Francisco José Reyes Peralta <gistdt08 at hotmail.es>






The parameter is not valid is the error that I get.I use an adaptation of the source .cs code in VB.NET.
Here is part of the code:
        Dim pixelFormat As PixelFormat	Dim dataType As DataType
        Dim pixelSpace As Integer

        If isIndexed Then
            pixelFormat = PixelFormat.Format8bppIndexed
            dataType = DataType.GDT_Byte
            pixelSpace = 1
        Else
            If channelCount = 1 Then
                If channelSize > 8 Then
                    pixelFormat = PixelFormat.Format16bppGrayScale
                    dataType = DataType.GDT_Int16
                    pixelSpace = 2
                Else
                    pixelFormat = PixelFormat.Format24bppRgb
                    channelCount = 3
                    dataType = DataType.GDT_Byte
                    pixelSpace = 3
                End If
            Else
                If hasAlpha Then
                    If channelSize > 8 Then
                        pixelFormat = PixelFormat.Format64bppArgb
                        dataType = DataType.GDT_UInt16
                        pixelSpace = 8
                    Else
                        pixelFormat = PixelFormat.Format32bppArgb
                        dataType = DataType.GDT_Byte
                        pixelSpace = 4
                    End If
                    channelCount = 4
                Else
                    If channelSize > 8 Then
                        pixelFormat = PixelFormat.Format48bppRgb
                        dataType = DataType.GDT_UInt16
                        pixelSpace = 6
                    Else
                        pixelFormat = PixelFormat.Format24bppRgb
                        dataType = DataType.GDT_Byte
                        pixelSpace = 3
                    End If
                    channelCount = 3
                End If
            End If
        End If

And the Error is in the following line:
Dim bitmap As New Bitmap(imageWidth, imageHeight, pixelFormat__1)
Is possible to read the dataset and write to a bitmap or picturebox without save as file?

Thanks for your reply.
Francisco J.

2011/4/19 Francisco José Reyes Peralta <gistdt08 at hotmail.es>

>  Dear friends, I'm vieweing the *GDALDatasetRasterIO.cs* from the Csharp
> samples of GDAL and I'm getting an error in the following line *Bitmap
> bitmap = new Bitmap(imageWidth, imageHeight, pixelFormat);* In the *
> pixelFormat* argument.
>

Hi,

What is the error message specifically?

Best regards,

Tamas
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20110419/cc8baab2/attachment-0001.html
 		 	   		  

_______________________________________________

gdal-dev mailing list

gdal-dev at lists.osgeo.org

http://lists.osgeo.org/mailman/listinfo/gdal-dev


 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/gdal-dev/attachments/20110420/36dcbf36/attachment.html