[gdal-dev] GDALDatasetDriver->poDriver = NULL

[Even Rouault]

On jeudi 8 octobre 2020 17:17:29 CEST Momtchil Momtchev wrote:
>      Hello,
> 
> 
>      Is it normal that for this code
> 
> int main() {
>      GDALAllRegister();
>      const char *pszFormat = "GTiff";
>      GDALDriver *driver =
> GetGDALDriverManager()->GetDriverByName(pszFormat); if (driver == nullptr)
> {
>          printf("driver is null\n");
>          return 1;
>      }
>      std::string path = "sample.tif";
>      GDALAccess access = GA_ReadOnly;
>      GDALOpenInfo *open_info = new GDALOpenInfo(path.c_str(), access);
>      GDALDataset *ds = driver->pfnOpen(open_info);
>      printf("%p\n", ds->GetDriver());
>      printf("%s\n", ds->GetDriver()->GetDescription());
> }
> 
> I get ds->GetDriver = NULL (and a segfault on the following line)? Tried
> on 3.1.2 and 3.1.0

Yes, you're using an implementation detail when using pfnOpen, that is not supposed to be 
used by user code. You should rather use GDALOpen / GDALOpenEx / GDALDataset::Open 
instead of using directly driver->pfnOpen
Those functions are the ones that set the poDriver member of the GDALDataset

Even

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