Initilizer-list cannot convert to const MARGINS* - c++

Question

Today I jumped to Visual Studio (C++) 2013, I was using Codeblocks a lot of time but I realized that codeblocks starts to fail at compiling some codes like this:
//#define _WIN32_WINNT 0x0500
#include "hMain.h"
#include <windows.h>
#include <Uxtheme.h>
int Width = 800;
int Height = 600;
const MARGINS* Margin = { 0, 0, Width , Height };
char lWindowName[256] = "TEEEST";
HWND hWnd;
char tWindowName[256] = "TEEEST";
HWND tWnd;
RECT tSize;
MSG Message;
LRESULT CALLBACK WinProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch (Message)
{
case WM_PAINT:
Render ();
break;
case WM_CREATE:
DwmExtendFrameIntoClientArea(hWnd, Margin);
break;
case WM_COMMAND:
if (wParam == VK_ESCAPE) PostQuitMessage(0);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return DefWindowProc(hWnd, Message, wParam, lParam);
break;
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hSecInstance, LPSTR nCmdLine, INT nCmdShow)
{
CreateThread(0, 0, (LPTHREAD_START_ROUTINE)SetWindowToTarget, 0, 0, 0);
WNDCLASSEX wClass;
wClass.cbClsExtra = NULL;
wClass.cbSize = sizeof(WNDCLASSEX);
wClass.cbWndExtra = NULL;
wClass.hbrBackground = (HBRUSH)CreateSolidBrush(RGB(0, 0, 0));
wClass.hCursor = LoadCursor(0, IDC_ARROW);
wClass.hIcon = LoadIcon(0, IDI_APPLICATION);
wClass.hIconSm = LoadIcon(0, IDI_APPLICATION);
wClass.hInstance = hInstance;
wClass.lpfnWndProc = WinProc;
wClass.lpszClassName = (LPCWSTR)lWindowName;
wClass.lpszMenuName = (LPCWSTR)lWindowName;
wClass.style = CS_VREDRAW | CS_HREDRAW;
if(!RegisterClassEx(&wClass))
exit(1);
tWnd = FindWindow(0, (LPCWSTR)tWindowName);
if (tWnd)
{
GetWindowRect(tWnd, &tSize);
Width = tSize.right - tSize.left;
Height = tSize.bottom - tSize.top;
hWnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_TRANSPARENT | WS_EX_LAYERED, (LPCWSTR)lWindowName, (LPCWSTR)lWindowName, WS_POPUP, 1, 1, Width, Height, 0, 0, 0, 0);
SetLayeredWindowAttributes(hWnd, 0, 1.0f, LWA_ALPHA);
SetLayeredWindowAttributes(hWnd, 0, RGB(0, 0, 0), LWA_COLORKEY);
ShowWindow( hWnd, SW_SHOW);
}
DirectXInit(hWnd);
for (;;)
{
if (GetAsyncKeyState(VK_ESCAPE)) break;
if(PeekMessage(&Message, hWnd, 0, 0, PM_REMOVE))
{
DispatchMessage(&Message);
TranslateMessage(&Message);
}
Sleep(1);
}
return 0;
}
void SetWindowToTarget()
{
while(true)
{
tWnd = FindWindow(0, (LPCWSTR)tWindowName);
if (tWnd)
{
GetWindowRect(tWnd, &tSize);
Width = tSize.right - tSize.left;
Height = tSize.bottom - tSize.top;
DWORD dwStyle = GetWindowLong(tWnd, GWL_STYLE);
if(dwStyle & WS_BORDER)
{
tSize.top += 23;
Height -= 23;
}
MoveWindow(hWnd, tSize.left, tSize.top, Width, Height, true);
}
else
{
char* ErrorMsg[125];
MessageBox(0, L"MAL", (LPCWSTR)L"Error - Cannot find the game!", MB_OK | MB_ICONERROR);
exit(1);
}
Sleep(100);
}
}
So, 2 question. First, how could I fix this compiler error: http://gyazo.com/6d7de9e0f3bad345dbbe7b9b80c90b8d And the second question. I realized that I must put an "L" and (LPCWSTR) before some chars*, this is 100% required? Is there any way to avoid that at least the (LPCWSTR)? Thanks for read.

Answer 1

First,
const MARGINS* Margin = { 0, 0, Width , Height };
is invalid. You probably want to create a new MARGINS object and initialize it with the given values, in which case you don't want Margin to be a pointer:
const MARGINS Margin = { 0, 0, Width , Height };
Second, DwmExtendFrameIntoClientArea() expects a const MARGINS*, which is a pointer to a MARGINS object. Just give it the address of Margin:
DwmExtendFrameIntoClientArea(hWnd, &Margin);
As to the wide character issues, I am assuming that you are compiling this with the "Unicode character set" in the project options. In this case, most strings in the Windows API will be pointers to wide characters (wchar_t*). However, you are allocating narrow character arrays (such as lWindowName) and casting them to a pointer to a wchar_t:
wClass.lpszClassName = (LPCWSTR)lWindowName;
This will give you all sorts of weird behaviours. Make sure your strings really are made of wide characters:
wchar_t lWindowName[256] = L"TEEEST";
This will allow you to drop most casts.