C / C++ / MFC

    LPVOID lpMsgBuf;
FormatMessage(
    FORMAT_MESSAGE_ALLOCATE_BUFFER |
    FORMAT_MESSAGE_FROM_SYSTEM |
    FORMAT_MESSAGE_IGNORE_INSERTS,
    NULL,
    GetLastError(),
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
    (LPTSTR) &lpMsgBuf,
    0,
    NULL );
MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK | MB_ICONINFORMATION );
LocalFree( lpMsgBuf );

#define WIN32_LEAN_AND_MEAN
#include < windows.h >
#include < stdlib.h >
#include < richedit.h >
#include < commctrl.h >

HWND _rich;
HMODULE _hRich;
char className[14];

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch(msg)
	{
	case WM_CREATE:
		_rich = CreateWindowEx(WS_EX_CLIENTEDGE,
							className,
							"Sample Text",
							WS_CHILD | WS_VISIBLE | ES_MULTILINE | WS_BORDER | WS_VSCROLL,
							10, 10,
							200, 200,
							hWnd,
							0,
							GetModuleHandle(0),
							0);
		
		LPVOID lpMsgBuf;	
		FormatMessage( 		
			FORMAT_MESSAGE_ALLOCATE_BUFFER | 		
			FORMAT_MESSAGE_FROM_SYSTEM | 		
			FORMAT_MESSAGE_IGNORE_INSERTS,		
			NULL,		
			GetLastError(),		
			MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language		
			(LPTSTR) &lpMsgBuf,		
			0,		
			NULL );	
		MessageBox( 
			NULL, 
			(LPCTSTR)lpMsgBuf, 
			"Error", 
			MB_OK | MB_ICONINFORMATION 
			);	
		LocalFree( lpMsgBuf );
		break;

	case WM_CLOSE:
		DestroyWindow(hWnd);
		break;

	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}

	return DefWindowProc(hWnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	WNDCLASSEX wc;
	HWND _hWnd;

	ZeroMemory(className, 14);
	InitCommonControls();

	_hRich = LoadLibrary("RICHED20.DLL");
	if (!_hRich)
	{
		_hRich = LoadLibrary("RICHED32.DLL");
		if (!_hRich)
		{
			MessageBox(0, "Richedit control not loaded!", "Error", MB_ICONERROR);
			exit(0);
		}
		else
		{
			strcpy(className, "RichEdit");
		}
	}
	else
	{
		strcpy(className, "RICHEDIT_CLASS");
	}

	wc.cbClsExtra = 0;
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.cbWndExtra = 0;
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW);
	wc.hCursor = 0;
	wc.hIcon = 0;
	wc.hIconSm = 0;
	wc.hInstance = hInstance;
	wc.lpfnWndProc = (WNDPROC)WndProc;
	wc.lpszClassName = "MainWindowClass";
	wc.lpszMenuName = 0;
	wc.style = 0;

	if (!RegisterClassEx(&wc))
	{
		MessageBox(0, "Error", "", MB_ICONERROR);
		exit(0);
	}

	_hWnd = CreateWindowEx(WS_EX_WINDOWEDGE,
					"MainWindowClass",
					"",
					WS_OVERLAPPEDWINDOW,
					0, 0,
					300, 300,
					0, 0,
					hInstance, 0);

	ShowWindow(_hWnd, SW_SHOW);
	UpdateWindow(_hWnd);

	MSG msg;

	while (GetMessage(&msg, 0, 0, 0) > 0)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

strcpy(className, "RICHEDIT_CLASS");

strcpy(className, RICHEDIT_CLASS);

HINSTANCE hLib;
hLib = LoadLibrary("Riched20.dll");
if (!hLib)
{
	hLib = LoadLibrary("Riched32.dll");
	if (!hLib)
	{
		MessageBox(0, "Richedit control failed to initialize!", "Editor", MB_ICONERROR);
		exit(0);
	}
	else
		strcpy(_className, "RichEdit");
}
else
{
	strcpy(_className, "RICHEDIT_CLASS");
}

void LineScroll(int nLines, int nChars = 0);<br />
<br />
Parameters:<br />
nLines <br />
Specifies the number of lines to scroll vertically. <br />
nChars<br />
<br />
Specifies the number of character positions to scroll horizontally. This value is ignored if the edit control has either the ES_RIGHT or ES_CENTER style.