Load and run Python scripts

On 26/01/2014 at 07:33, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R15 
Platform:   Windows  ;   
Language(s) :     C++  ;

I trying to load and run a python script using the example given.
It keeps coming up with FILEERROR = -100 = [FILEERROR_WRONG_VALUE](file:///D:/Users/pgrooff/Documents/pim/c4d/c++%20R15%20sdk/help/pages/ge_prepass/enum_FILEERROR560.html#fileerror_wrong_value9); ???

What am I doing wrong?

		case 1000:		//do command	
		  Filename fn = "test.py";
		  BaseList2D *op=(BaseList2D* )AllocListNode(ID_PYTHONSCRIPT);
		  //BaseDocument *doc = GetActiveDocument();
		  //Int32 error = ReadHyperFile(doc,op,fn,'scrp',nullptr);
		  Int32 error = ReadHyperFile(nullptr,op,fn,'scrp',nullptr);
		  GePrint ("error: " + String::IntToString(error));					// always FILEERROR_WRONG_VALUE?
		  if (op && ReadHyperFile(nullptr,op,fn,'scrp',nullptr)==FILEERROR_NONE)
			BaseBitmap *ptr=nullptr;
			//annotations = op->GetDataInstance()->GetString(PYTHONSCRIPT_TEXT);

Note: I am doing the ReadHyperFile twice to get the FILEERROR more clear.
The script is found, if else a -1 would be given.

Also, I do not know how to define "annotations", String?

On 28/01/2014 at 07:44, xxxxxxxx wrote:


I can confirm this issue with ReadHyperFile().
I've got the same FILEERROR_WRONG_VALUE returned with a valid script filename.

I've asked the developers on this issue.

On 29/01/2014 at 05:07, xxxxxxxx wrote:


The documentation is wrong.
The example code for ID_PYTHONSCRIPT only works with ID_COFFEESCRIPT because a Python script isn't a hyper file (a COFFEE script is).
This is why ReadHyperFile() is always returning FILEERROR_WRONG_VALUE.

The Python script content has to be put manually into PYTHONSCRIPT_TEXT.

On 29/01/2014 at 06:30, xxxxxxxx wrote:

Thanks for the quick reply.
Could you please provide an example?

On 29/01/2014 at 08:26, xxxxxxxx wrote:

Here's how to execute a Python script with the C++ API:

Filename fname = "path/to/script.py";
AutoAlloc<BaseFile> file;
// Allocate a Python script node
BaseList2D* op = (BaseList2D* )AllocListNode(ID_PYTHONSCRIPT);
if (op!=nullptr && file->Open(fname))
  BaseContainer* data = op->GetDataInstance();
  if (data==nullptr)
    return false;
  // Allocate a memory buffer to hold the Python script file
  Int64 length = file->GetLength();
  Char* text = NewMem(Char, length+1);
  if (text==nullptr)
    return false;
  // Read the Python script
  Char ch;
  while (file->ReadChar(&ch))
    text[file->GetPosition()-1]= ch;
  text[length] = '\0';
  // Set the Python script text in the Python script node container
  data->SetString(PYTHONSCRIPT_TEXT, text);
  // Do not forget to delete the memory buffer for the script text
  // Execute the script
  op->Message(MSG_SCRIPT_EXECUTE, nullptr);
// Delete the Python script node

On 30/01/2014 at 05:15, xxxxxxxx wrote:

Great, it works, thanks.
One addition. Apparently there is some mismatch wit the end -of-line handling, because I have to add a remark (#) at the end of every line. But it works!

import c4d  #
from c4d import gui #
#Welcome to the world of Python
def main() :     #
    gui.MessageDialog('Hello World!')  #
if __name__=='__main__':    #
    main()                  #