AcDbObjectId (*)()" is incompatible with parameter of type "AcRxFunctionPtr"

[ShricharanaB]

Hi, 

I'm absolutely new to this, trying to learn.

I'm getting the above error when trying to create new command calling the createLine() function from the Object ARX help webpage. What am I doing wrong here? 

This is how I'm creating new commands.

void initApp()
{
	//Register a command with AutoCAD command mechanics.
	acedRegCmds->addCommand(_T("HelloWorld_Commands"),
		_T("Hello"),
		_T("SayHello"),
		ACRX_CMD_TRANSPARENT,
		helloworld);
	acedRegCmds->addCommand(_T("HelloWorld_Commands"),
		_T("FAPLCreateLine"),
		_T("FAPLCreateLine"),
		ACRX_CMD_TRANSPARENT,
		createLine);
}

 This is the createLine( ) function from the help webpage.

AcDbObjectId createLine()
//void createLine()
{
	AcGePoint3d startPt(4.0, 2.0, 0.0);
	AcGePoint3d endPt(10.0, 7.0, 0.0);
	AcDbLine *pLine = new AcDbLine(startPt, endPt);
	AcDbBlockTable *pBlockTable;
	acdbHostApplicationServices()->workingDatabase()
		->getSymbolTable(pBlockTable, AcDb::kForRead);
	AcDbBlockTableRecord *pBlockTableRecord;
	pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
		AcDb::kForWrite);
	pBlockTable->close();
	AcDbObjectId lineId;
	pBlockTableRecord->appendAcDbEntity(lineId, pLine);
	pBlockTableRecord->close();
	pLine->close();
	return lineId;
}

Thanks in advance for any help!

[Alexander.Rivilis]

createLine have return nothing (e.g. void)

[ShricharanaB]

Hi @Alexander.Rivilis ,

Thank you for the response. 

I don't understand what you are trying to say. In the createLine function the LineID is being returned. 

Or are you saying the addCommand is expecting a void function? 

If that is the case, how to I add the command so that it can execute the createLine() function which is not  a void function? 

I did try converting the createLine() function to void function and removing the return line, but that doesn't work either. I think it has to be AcDbObjectId createLine(). 

[Alexander.Rivilis · Accepted solution]

@ShricharanaB 

Function that registered with acedRegCmds->addCommand may not return any value. This function has declaration such as:

void  createLine(void);

[ShricharanaB]

Hi, @Alexander.Rivilis 

That worked. I was able to compile and test the arx file.

Thank you!!

void createLine()
{
	AcGePoint3d startPt(4.0, 2.0, 0.0);
	AcGePoint3d endPt(10.0, 7.0, 0.0);
	AcDbLine *pLine = new AcDbLine(startPt, endPt);
	AcDbBlockTable *pBlockTable;
	acdbHostApplicationServices()->workingDatabase()
		->getSymbolTable(pBlockTable, AcDb::kForRead);
	AcDbBlockTableRecord *pBlockTableRecord;
	pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
		AcDb::kForWrite);
	pBlockTable->close();
	AcDbObjectId lineId;
	pBlockTableRecord->appendAcDbEntity(lineId, pLine);
	pBlockTableRecord->close();
	pLine->close();
	
}