This is what I normally do, however it's not much less pain, even it's
simple.
I typically write a wrapper to execute all GetProcAdress() functions at
once and store
pointers in the class.
Taking into number of GDAL functions, its' would be very challenging.
Mikhail
On 2/22/2011 2:43 PM, Even Rouault wrote:
Le mardi 22 février 2011 23:14:50, Mikhail Tchernychev a écrit :
Hello List,
I wonder if someone could point me into the right direction. I would
like to use
GDAL as loaded DLL at run time, with LoadLibray() call under windows
and corresponding
calls under Linux. I see that most of the functions are virtual, so it
seems it is made
with this in mind. I am trying to compile simple program:
I think you are going to inflict you a lot of pain with LoadLibrary() and C++
API at the same time !
If you really need to dynamicly load gdal, use the GDAL C API instead...
#include "stdafx.h"
#include<windows.h>
#define CPL_DLL
#include "ogrsf_frmts.h"
typedef void (* pOGRRegisterAll)();
typedef OGRSFDriverRegistrar * (*pGetRegistar)();
int _tmain(int argc, _TCHAR* argv[])
{
const char *pszDriverName = "ESRI Shapefile";
HMODULE hDll = LoadLibrary("gdal18.dll");
if(!hDll) {
fprintf(stderr,"Cannot load library\n");
exit(0);
}
pOGRRegisterAll pRegFunc =
(pOGRRegisterAll)GetProcAddress(hDll,"OGRRegisterAll");
(*pRegFunc)();
OGRSFDriver *poDriver;
OGRSFDriverRegistrar * poRegistrar;
pGetRegistar pRegistrarFunc =
(pGetRegistar)GetProcAddress(hDll,"?GetRegistrar@OGRSFDriverRegistrar@@SAPA
V1@XZ");
if(pRegistrarFunc == NULL )
{
printf( "Cannot get registrar\n");
exit( 1 );
}
poRegistrar = (*pRegistrarFunc)();
if( poRegistrar == NULL )
{
printf( "Cannot get poRegistrar\n");
exit( 1 );
}
// link error here:
poDriver = poRegistrar->GetDriverByName(pszDriverName);
if( poDriver == NULL )
{
printf( "%s driver not available.\n", pszDriverName );
exit( 1 );
}
return 0;
}
This is just part of the GDAL API tutorial.
I see two problems here:
1. I have to use C++ mangled names, which is not very nice. Is there
.DEF file for GDAL
with meaningful names?
2. I got a link error, which apparently clear why, because
GetDriverByName() is not virtual.
Now then could I create new files if GDAL is loaded dynamically?
I am using latest GDAL source with VC++ 2010
I tried to search mail list but did not seem find anything.
Thank you very much,
Mikhail
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