[Gdal-dev] Problems Linking with Stubs in the precompiled downloadable Win32 Binaries.

[Fam. Pool]

Fo Sheezy -

This is a simplified version of the code - note that I'm using a MapInfo
Data Source, a directory with several .TAB, .DAT, .MAP etc files (so in GDAL
talk: a couple 'o Layers).

bool cVectorLoader::loadOGRVector(char* sVectorMap)
{
  //DataSet
  OGRDataSource* poDataSet = (OGRDataSource*)
OGRSFDriverRegistrar::Open(sVectorMap, false);
  if (poDataSet == NULL)
  {
    return false;
  }

  const char* sName = poDataSet->GetName();
  int iNrOfLayers = poDataSet->GetLayerCount();

  cout << endl << "<OGR> Report for Vector Dataset " << sName << endl;
  cout << "Dataset has " << iNrOfLayers << " layer(s)." << endl;

  //Layers
  for (int i=0; i < iNrOfLayers; i++)
  {
    cout << "For layer " << i+1 << endl;

    OGRLayer* poLayer = (OGRLayer*) poDataSet->GetLayer(i);
    if (poLayer != NULL)
    {
      //Features
      int iNrOfFeatures = poLayer->GetFeatureCount(true);
      OGRFeature* poFeature = (OGRFeature*) poLayer->GetNextFeature();

      cout << "Layer has " << iNrOfFeatures << " features" << endl;

      int j=1;
      while (poFeature != NULL)
      {
        //Style
        cout << "Feature " << j << " with ID " << poFeature->GetFID()
             << " and Style String " << poFeature->GetStyleString () <<
endl;

        OGRStyleTable oStyleTable;
        OGRStyleTool* poStyleTool;
        OGRStyleMgr*  poStyleMgr = new OGRStyleMgr(&oStyleTable);

        poStyleMgr->GetStyleString(poFeature);
        for (int k=0; poStyleMgr->GetPartCount(); k++)
        {
           poStyleTool = poStyleMgr->GetPart(k);
           switch(poStyleTool->GetType())
           {
             case OGRSTCNone: cout << "Style = None" << endl;
              break;
             case OGRSTCPen: cout << "Style = Pen" << endl;
              break;
             case OGRSTCBrush: cout << "Style = Brush" << endl;
              break;
             case OGRSTCSymbol: cout << "Style = Symbol" << endl;
              break;
             case OGRSTCLabel: cout << "Style = Label" << endl;
              break;
           }
        }

        ...

        poFeature = (OGRFeature*) poLayer->GetNextFeature();
        j++;
      }
    }
  }
  cout << endl << "<OGR> End of Report" << endl;

  //Clean up
  delete poDataSet;

  //Function completed successfully
  return true;
}

Compilation is all good. When linking I get ze following errors.

Linking...
   Creating library Debug/MapViewer.lib and object Debug/MapViewer.exp
cMapVisual.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStylePen" (?asStylePen@@3PAUogr_style_param@@A)
cVectorLoader.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStylePen" (?asStylePen@@3PAUogr_style_param@@A)
MapViewer.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStylePen" (?asStylePen@@3PAUogr_style_param@@A)
cMapVisual.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleBrush" (?asStyleBrush@@3PAUogr_style_param@@A)
cVectorLoader.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleBrush" (?asStyleBrush@@3PAUogr_style_param@@A)
MapViewer.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleBrush" (?asStyleBrush@@3PAUogr_style_param@@A)
cMapVisual.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleSymbol" (?asStyleSymbol@@3PAUogr_style_param@@A)
cVectorLoader.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleSymbol" (?asStyleSymbol@@3PAUogr_style_param@@A)
MapViewer.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleSymbol" (?asStyleSymbol@@3PAUogr_style_param@@A)
cMapVisual.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleLabel" (?asStyleLabel@@3PAUogr_style_param@@A)
cVectorLoader.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleLabel" (?asStyleLabel@@3PAUogr_style_param@@A)
MapViewer.obj : error LNK2001: unresolved external symbol "struct
ogr_style_param *  asStyleLabel" (?asStyleLabel@@3PAUogr_style_param@@A)
Debug/MapViewer.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.

I'm using gdal_i.lib => gdal12.dll, the ones from the downloadable binaries.
I should add that for the past three yrs I've been a Java Boy and for the
last two weeks I've been brushing up on my C skills, which I haven't used
since my Varsity days. I could just be doing something stupid. However,
everything links fine when I comment out the Style Tool thingies.

BTW Frank - thanks for the great library!

Louis.





-----Original Message-----
From: gdal-dev-admin at remotesensing.org
[mailto:gdal-dev-admin at remotesensing.org]On Behalf Of Frank Warmerdam
Sent: 10 May 2004 10:09
To: gdal-dev at remotesensing.org
Subject: Re: [Gdal-dev] Problems Linking with Stubs in the precompiled
downloadable Win32 Binaries.


Fam. Pool wrote:
> Hi,
>
> I'm quite new to the GDAL world and sofar its gone quite smoothly - but
> today I tried using OGR Style Tools and now I'm getting unresolved symbol
> errors when linking the libs. Its just looks as tho something was left out
> of the precompiled binaries. I'm going to try building the GDAL package
from
> scratch and see if the stubs the scripts generate solve the problem.
Still,
> I like doing things the easy way. If someone could verify the integrity of
> the pre-compiled Win32 binaries that would be swell.

Louis,

There are indeed some issues with linking against the DLL version of OGR
and using some of the style related classes.  I am a bit uncertain what
the exact problem is, but if you can list your link errors, and provide
a smallish example program that demonstrates the problem I will try and fix
it.  I have run into a similar problem with MapServer but never succeeded in
resolve it.

Note, the problem can be worked around by linking against static versions of
OGR but if possible i would prefer to just fix the base problem.

Best regards,
--
---------------------------------------+------------------------------------
--
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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