[gdal-dev] Supporting ECW as a plugin. (Windows)
woklist at kyngchaos.com
Tue Dec 9 13:16:34 EST 2008
On Dec 9, 2008, at 11:37 AM, Daniele Romagnoli wrote:
> When running gdalinfo I get this error:
> ERROR 1: Can't find requested entry point: GDALRegister_ECW_JP2ECW
> Indeed, putting the generated DLL in the "depends/dependency walker"
> tool, I have only noticed the presence of the following two functions:
> - GDALRegister_ECW
> - GDALRegister_JP2ECW
> whilst the GDALDriverManager:autoLoadDrivers function does:
> 1) looks for a DLL in the specified GDAL_DRIVER_PATH --->
> 2) tries to call GDALRegister_ECW_JP2ECW function (missing).
> The weird thing is that "ecwdataset.cpp" contains that function but
> the generated DLL doesn't contain it.
> I have also noticed that the ECW plugin available here (http://download.osgeo.org/gdal/win32/1.5/
> ) doesn't contain that registration function.
> Does anyone already successfully used the ECW as a separated plugin
> on windows?
> Am I doing something wrong?
> Any tips/suggestion would be really appreciated.
Strange coincidence, or it points to some GDAL bug: I was messing
around with ECW on OSX as a plugin this weekend. When I compiled the
plugin for GDAL 1.6, it loaded. When I compiled the plugin for GDAL
1.5, I got the equivalent error:
ERROR 1: dlsym(0x10160bd50, _GDALRegister_ECW_JP2ECW): symbol not found
ERROR 1: dlsym(0x10160bd50, _GDALRegisterMe): symbol not found
Simply renaming the plugin either gdal_ECW or gdal_JP2ECW works to
load the driver for the named format.
Having one as gdal_ECW, then symlinking that to gdal_JP2ECW works to
load both. I don't know what the equivalent to symlink is on Windows,
but duplicating the binary should also work.
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
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