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我有这个 Visual C++ 代码，加上嵌入的 Python，当我尝试使用以下代码运行外部 Python 代码时，我在调试模式下收到错误： 

Unhandled exception at 0x77cf15de in CMLAir.exe (my code): 
access violation writing location 0x00000014.

当 PyRun_File 函数通过 c++ 代码调用时，就会发生错误。
这是 C++ 函数：

  void CRailtestDoc::OnPreprocessorRunscript()
  {

  #ifdef USE_PYTHON

//for now, pull up Open dialog for user to specify script
CString strPythonScriptPath;
CString strTitle = "Run Python Script";
CFileDialog dlg(TRUE, ".py", NULL);
dlg.m_ofn.Flags |= OFN_PATHMUSTEXIST;
dlg.m_ofn.lpstrTitle = (LPCTSTR)strTitle;
if (dlg.DoModal() == IDOK)
{
    strPythonScriptPath = dlg.GetFileName( );
}
else
{
    return;
}

FILE* fp;
fp = fopen((LPCSTR)strPythonScriptPath, "r+");
if (fp == NULL)
{
    CString strErrMsg;
    strErrMsg.Format("troble opening python file: %s", (LPCSTR)strPythonScriptPath);
    AfxMessageBox(strErrMsg);
    return;
}

//
// TODO: we need to make sure that we don't call Py_Initialize more than once
// see Python/C API Reference Manual section 1.4
//
m_bRunningScript = TRUE;
Py_Initialize();

PycString_IMPORT; //Macro for importing cStringIO objects

//start up our own modules?  Is this needed here?
initcml();
initresults();

PyObject* localDict;
PyObject* mainModule;
PyObject* mainModuleDict;
mainModule = PyImport_AddModule("__main__");
//mainModule = PyImport_AddModule("__builtins__");

if(mainModule==NULL)
{
    AfxMessageBox("Problems running script");
    m_bRunningScript = FALSE;
    return;
}
mainModuleDict = PyModule_GetDict(mainModule);
localDict = PyDict_New();

//Now run the selected script
PyObject* tempPyResult = 
PyRun_File(fp, strPythonScriptPath, Py_file_input, mainModuleDict, mainModuleDict); 
//<=== where the code exit with unhandled  exception at 0x77cf15de
UNREFERENCED_PARAMETER(tempPyResult);

// See if an exception was raised and not handled.
// If so, return traceback to user as MsgBox

}

这是我试图从 C++ 代码运行的外部 Python 脚本：

  import cml, results 

  def main():
  baseCase = "C:\\Program Files\\CMLAir32\\Examples\\Quick4_Example.cml" 
  outFile = "c:\\output.txt"
  f = open(outFile, "w") 

  #open our .cml case
  if cml.OpenCase(baseCase) == 0:
    return 

  #set initial mesh size 
  meshSize = 177
  cml.SetGridSizeX(meshSize)
  cml.SetGridSizeY(meshSize)
  cml.SaveCaseNoWarn()
  while meshSize < 400:
    #run it 
    cml.RunCaseNoWarn()
    #get results
    res = results.Results()
    res.GetResults() 
    if res.HasResults() == 0: 
        cml.MsgBox("error getting results, aborting") 
        return 
    #pull out minimum fly height 
    singleResult = res[0]
    fh = singleResult.minFH
    #output current mesh size and minimum fly height 
    dataStr = str(meshSize) + ' ' + str(fh)
    f.write(dataStr) 
    #increment mesh size 
    meshSize += 16
    cml.SetGridSizeX(meshSize) 
    cml.SetGridSizeY(meshSize) 
    cml.SaveCaseNoWarn()

    main()

为什么 PyRun_File 函数会报错？

我对在 C++ 代码中嵌入 Python 了解不多，所以我非常感谢这里的一些指针。请记住，我对 Python 还比较陌生。我的大部分编程经验都在 Visual C++ 中。在这种情况下，将两者结合在一起的最佳方法是什么？

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1 回答 1

2

fp错误是由于C++ 和 python 版本之间的误解或混淆fp，所以，我所做的是我注释掉了这一fp行，而不是我使用：

PyObject* PyFileObject; PyFileObject = PyFile_FromString(strPythonScriptPath, "r");

效果非常好！

于 2012-06-21T23:43:21.320 回答