topic AcDbObjectId (*)()" is incompatible with parameter of type "AcRxFunctionPtr" in ObjectARX Forum

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

ShricharanaB — Wed, 02 Nov 2022 09:22:08 GMT

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!

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

Alexander.Rivilis — Wed, 02 Nov 2022 12:33:40 GMT

createLine have return nothing (e.g. void)

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

ShricharanaB — Wed, 02 Nov 2022 13:16:44 GMT

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().

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

Alexander.Rivilis — Wed, 02 Nov 2022 13:19:40 GMT

@ShricharanaB

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

void createLine(void);

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

ShricharanaB — Thu, 03 Nov 2022 04:36:38 GMT

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(); }