Getting text from another apps. textbox EM_GETLINE returns 0

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C++

Hello !

I'm having a problem with EM_GETLINE. I have a textbox I want to extract the text from. The box keeps updating all the time (it's a log file thet keeps updating, last message at the bottom). All I want is that very last line.

My code:

HWND hwnd = (HWND)0x00050440;
		char display[256];
	    LONG lResult;
		TCHAR  tszString[256];
	    
		/*
		TCHAR param[256];
		lResult = SendMessage( hwnd, WM_GETTEXT, 500, (LPARAM)param);
		*/
		
		//Find out the number of lines in the textbox
		int nLines = SendMessageW(hwnd, EM_GETLINECOUNT, 0, 0)-1;
		
		lResult = SendMessageW( hwnd, EM_GETLINE, nLines, (LPARAM)tszString); 
	    
		//Find out how many characters are collected ERROR: Returns 0 ??
		int nLength = SendMessageW(hwnd, EM_GETLINE, (WPARAM)nLines, (LPARAM)tszString);
		
		//Adding the string terminating NULL
		tszString[nLength] = '\0';  
		
		wcstombs(display, tszString, 256);
	    //wcstombs(display, param, 256);
	    printf( " %s\n", display );

I keep getting 0 for nLength. MSDN say thats because I adress a linenumber larger than lines found in the textbox. Thats not the case.
The handle is correct, when using GETTEXT I get all the text from the box. ( Testing it on notepad...)
I'm not sure if I have initialized the buffer correct.
MSDN: "Before sending the message, set the first word of this buffer to the size, in TCHARs, of the buffer." :confused:
Right now the result is a empty console. No text... :((

I have Unicode set as characterset in my project, could that be a problem?

Regards
SH