Just a simple question... is "scriptstring.h" necessary for using strings in AngelScript, or is it merely there to illustrate adding on to the language or something like that? I sometimes run into problems when including it in a new project, and would just like to know if I can omit it. Thanks.

Omit if you don't want to pass strings as function parameters between AS and you're code.

Hi,

Sorry for occupy the thread, but I have some problems with strings and I think this thread is good place to talk :)

I need strings en my script, but I can't use std::string because I want my engine be multiplatform. That's the reason why I can't use ScriptString, I download bstr than looks useful for me, but I try to use it and I have a lot of errors:

1) Compiling error:

'RegisterTypeBehaviour' : is not a member of 'asIScriptEngine'

Looks like bstr use an old version of AngelScript. I change RegisterTypeBehaviour by RegisterObjectBehaviour.

2) Executing error:

In the scriptMessageCallback:

"Only object types that support object handles can use &inout. Use &in or &out instead".

I include '&in' in all references.

3) crash:

line:
r = engine->RegisterObjectBehaviour(0, asBEHAVE_ADD, "bstr f(const bstr &in, const bstr &in)", asFUNCTION(asBStrConcatenate), asCALL_CDECL);

callback:
GameEngine.exe!asCString::Compare(const char * str=0x00000000)
GameEngine.exe!operator==(const asCString & a={...}, const char * b=0x00000000)
GameEngine.exe!asCConfigGroup::FindType(const char * obj=0x00000000)
GameEngine.exe!asCScriptEngine::RegisterObjectBehaviour(const char * datatype=0x00000000, unsigned long behaviour=14, const char * decl=0x004f35b8, const asUPtr & funcPointer={...}, unsigned long callConv=0)

I think is the first param faults. I change by "bstr"

4) Executing error:

error -7 ( asNOT_SUPPORTED ):

line:
r = engine->RegisterObjectBehaviour("bstr", asBEHAVE_ADD, bstr f(const bstr &, const bstr &in)", asFUNCTION(asBStrConcatenate),asCALL_CDECL);

Change asCALL_CDECL by asCALL_GENERIC

5) Executing error:

In the scriptMessageCallback:

error: "This behaviour must be registered as global behaviour"


line:
r = engine->RegisterObjectBehaviour("bstr", asBEHAVE_ADD,bstr f(const bstr &in, const bstr &in)", asFUNCTION(asBStrConcatenate),asCALL_GENERIC);


And this is all, I don't know what's wrong. Any help? thank you!

Quote:Original post by WitchLord
On what platforms doesn't std::string work?

Well, I don't know but char is in everywhere :) (now you can call me silly haha)

I insert the new code, but I have some problems and doubts:

- How I can pass a bstr argument to the script? I test SetArgObject( char_address ) and don't work (the application crash), I use SetArgAddress() and dont't have problems, but don't work neither.

Script:

void OnInit( Entity@ pEntity, bstr str )
{
pEntity.Foo( str );
}

Code:

pScriptEngine->RegisterObjectMethod( "Entity", "void Foo( bstr )", asFUNCTION( Script_Foo ), asCALL_GENERIC );


- How I can get a char* form bstr?.

Script:

void OnInit( Entity@ pEntity )
{
pEntity.Foo( "niano" );
}

Code:

static void Script_Foo( asIScriptGeneric *gen )
{
const char *pszParam = what??
asBSTR niano = ( asBSTR )gen->GetArgObject( 0 ); // this don't work
asBSTR niano = ( asBSTR )gen->GetArgAddress( 0 ); // don't work
asBSTR niano = ( asBSTR )gen->GetArgPointer( 0 ); // don't work
}

Thank you.

Hi, it's me again ( sorry for be so boring )

I try what you said, the part of retrieving bstr from script works fine. But when I pass a bstr to script, I found some problemas, I will try this:

Script:

void OnInit( Entity@ pEntity, bstr str01, bstr str02 )
{
pEntity.Foo( str01, str02 );
}

Code:

const char *pszString = va_arg( iter, const char* );

asBSTR bstr = asBStrAlloc( strlen( pszString) );
strcpy( ( char* )bstr, pszString );

*( asBSTR** )m_pScriptContext->GetArgPointer( iVarPos++ ) = bstr;


1) This cause a compiler error in this line:

*( asBSTR** )m_pScriptContext->GetArgPointer( iVarPos++ ) = bstr;

"cannot convert from 'asBSTR' to 'asBSTR * '". I try 2 things:

- this:

**( asBSTR** )m_pScriptContext->GetArgPointer( iVarPos++ ) = bstr;

Cause a executing error: "Unhandled exception at 0x0045c928 in GameEngine.exe: 0xC0000005: Access violation writing location 0x00000000." when execute the line.

- and this:

*(asBSTR**)m_pScriptContext->GetArgPointer( iVarPos++ ) = &bstr

Execute properly, and call Script_Foo( asIScriptGeneric *gen ) when execute the line pEntity.Foo( str01, str02 ) in the script, but when I try to read the strings, using this:

asBSTR str01 = **( asBSTR** )gen->GetArgPointer( 0 );
asBSTR str02 = **( asBSTR** )gen->GetArgPointer( 1 );

The two strings have the same valour (the second string pass to the OnInit function), and a little after, the application crash:

"Unhandled exception at 0x7c911230 in GameEngine.exe: User breakpoint"

With this callstack:


ntdll.dll!7c970af8()
kernel32.dll!7c85e9cf()
msvcr71d.dll!_CrtIsValidHeapPointer(const void * pUserData=0x0012f4f4) Line 1807
msvcr71d.dll!_free_dbg_lk(void * pUserData=0x0012f4f4, int nBlockUse=1) Line 1132 + 0x9
msvcr71d.dll!_free_dbg(void * pUserData=0x0012f4f4, int nBlockUse=1) Line 1070 + 0xd
msvcr71d.dll!free(void * pUserData=0x0012f4f4) Line 1025 + 0xb
GameEngine.exe!asCScriptEngine::CallFree(asCObjectType * type=0x0cada788, void * obj=0x0012f4f4) Line 2672 + 0x9
GameEngine.exe!asCContext::ExecuteNext() Line 1989
GameEngine.exe!asCContext::Execute() Line 923 + 0x8
...

Thank you.