[Open Babel] having trouble generating .png picture in c++

[xh s]

Hi,

I'm trying to convert a SMILES string to a png picture using openbabel C++
library. Here's a minimal code that says what I want to do.

#include <openbabel/obconversion.h>
#include <openbabel/mol.h>
#include <openbabel/op.h>
#include <openbabel/plugin.h>
#include <iostream>
using namespace std;
using namespace OpenBabel;

int main() {
  stringstream inputSmiles("CCC(CC)C");
  ofstream pic("minimal_conversion_pic.png");
  OBConversion conv(&inputSmiles, &pic);
  conv.SetInAndOutFormats("smi", "png");
  OBMol mol;
  conv.Read(&mol);
  OBOp* pOp = OBOp::FindType("gen2D");
  pOp->Do(&mol);
  conv.Write(&mol);
}


This compiles and runs fine but it generates a png that's only a few bytes
and can't be open. I tried the same code with "png" replaced by "svg" and
it worked. However for various reasons I want to use png instead of svg. I
guess it might be a cairo issue but I'm not sure.

Thanks in advance!


Xianghai Sheng

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