Working with strings in expressions

[cfusion2015]

Hello.

I tried to create my own extension. It worked fine with passing and returning numbers in expressions. But how to do this with strings? I thought p1 was the memory address pointing to the string. But my code outputs nothing (empty string). What do I do wrong?

short expressionsInfos[]=
		{
		IDMN_EXPRESSION, M_EXPRESSION, EXP_EXPRESSION, EXPFLAG_STRING, 1, EXPPARAM_STRING, 0,
		
		//Note in the following.  If you are returning a string, you set the EXPFLAG_STRING.	
		IDMN_EXPRESSION2, M_EXPRESSION2, EXP_EXPRESSION2, EXPFLAG_STRING, 1, EXPPARAM_STRING, 0,
		
		//Note in the following.  If you are returning a float, you set the EXPFLAG_DOUBLE
		IDMN_EXPRESSION3, M_EXPRESSION3, EXP_EXPRESSION3, EXPFLAG_DOUBLE, 1, EXPPARAM_LONG, 0,
		};



long WINAPI DLLExport Expression2(LPRDATA rdPtr,long param1)
{

	long p1 = CNC_GetFirstExpressionParameter(rdPtr, param1, TYPE_STRING);
	
	std::string str(*(std::string*)p1);

	str = "changed text";

	long addr = (long)&str;

	rdPtr->rHo.hoFlags |= HOF_STRING;

	return addr;

}

[LB]

Fusion doesn't use std::string internally. You need to cast to char const * and construct a std::string from that. For example:

std::string str = reinterpret_cast<char const *>(p1);

By the way, I highly recommend you do not use the original extension SDK and instead use the official EDIF SDK or my modified fork of EDIF - EDIF makes the extension development process much simpler and less error-prone.

[cfusion2015]

I'm using EDIF now. Tried to select a window by its unicoded window title, but it always returns 0: (tested the same with char*, it all worked, but it doesnt handle unicode)

In Expressions.cpp

int Extension::HelloWorld(const wchar_t * str_in)
{
 
    HWND win = FindWindowW(0, str_in);
 
    if (win != 0) {
 
        ShowWindow(win, SW_RESTORE);
        ShowWindow(win, SW_SHOW);
        SetForegroundWindow(win);
        SetCapture(win);
        SetFocus(win);
        SetActiveWindow(win);
 
        return 1;
    }
 
    return 0;
}

Extension.h:

int HelloWorld(const wchar_t * str_in);

Ext.json:

{
            "Title": "HelloWorld$(",
          "Returns": "Integer",
                "Parameters":
        [
			["Text", "Your text"]
        ]
        }

[cfusion2015]

Needed to change runtime to unicode runtime in projects' configuration. That fixed it.