String to CString

Monkey Forums/Monkey Beginners/String to CString

k.o.g.

(Posted 2014) [#1]

Hi all

I need to convert a Monkey String to normal CString (char*)

Any idea, how i can do that?

My start was:

char *StringToChar(String str)
{
	char *c = str.ToCString<char>();
	return "";
}

but i gives me an error:

main.cpp: In function 'char* StringToChar(String)':
main.cpp:2213:31: error: invalid user-defined conversion from 'String::CString<char>' to 'char' [-fpermissive]
char c = str.ToCString<char>();

can anybody help me?

Danilo

(Posted 2014) [#2]

Monkey uses wide char (Unicode) characters and strings.

functions.cpp

const Char* StringToChar(String str) {
    return str.Data();
}

const Char* StringToCharZ(String str) {
    return std::wstring(str.Data(),str.Length()).c_str();
}

String NullTerminatedString(String str) {
    Char character=0;
    return str + String(&character,1);
}

std::wstring StringToWString(String str) {
    return std::wstring(str.Data(),str.Length());
}

String::CString<Char> StringToCString(String str) {
    return str.ToCString<Char>();
}

ToCString.monkey

Import "functions.cpp"

Extern
    Function StringToChar(str:String)
    Function StringToWString(str:String)
    Function StringToCString(str:String)
    Function NullTerminatedString:String(str:String)
Public

Function Main:Int()
    StringToChar("myString")
    StringToWString("myString 2")
    StringToCString("myString 3")
    
    Local str:= NullTerminatedString("Hello World!")
    For Local i:= 0 Until str.Length()
        Print Int(str[i])
    Next
    Return 0
End

k.o.g.

(Posted 2014) [#3]

thanks for this hint....

in my case, it'ss pointless to use "String::CString<Char>" right? It's monkey only?

Danilo

(Posted 2014) [#4]

If you want C++ strings in C++ functions, I think you would use std::wstring(str.Data(),str.Length())

k.o.g.

(Posted 2014) [#5]

when i use str.Data(), then it seems like, it have none NULL Terminated end... how can i fix that?

if (this->hWnd != 0) SetWindowTextW(this->hWnd, /*this->text.ToCString<char>()*/this->text.Data());

Danilo

(Posted 2014) [#6]

Try

if (this->hWnd != 0) SetWindowTextW(this->hWnd, std::wstring(this->text.Data(),this->text.Length()).c_str());

const Char* StringToCharZ(String str) {
    return std::wstring(str.Data(),str.Length()).c_str();
}

if (this->hWnd != 0)
    SetWindowTextW( this->hWnd, StringToCharZ(this->text) );

String NullTerminatedString(String str) {
    Char character=0;
    return str + String(&character,1);
}

if (this->hWnd != 0)
    SetWindowTextW( this->hWnd, NullTerminatedString(this->text).Data() );

Better use NullTerminatedString() directly when you get the string from Monkey code,
because WinAPI always wants Null-Terminated strings.

Also edited first answer to show NullTerminatedString() in monkey code.

k.o.g.

(Posted 2014) [#7]

Ahhh thanks for the code.
I was hoping, thats easier :D

Danilo

(Posted 2014) [#8]

If you define this->text as being of type std::wstring, you would write API functions like this:

if (this->hWnd != 0)
    SetWindowTextW( this->hWnd, this->text.c_str() );