**Hi there,
I’m working on my first non-console program and I’m stuck. This is the skeleton code I start with :**
#include <windows.h>
const char g_szClassName[] = "myWindowClass";
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
//Step 1: Registering the Window Class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
// Step 2: Creating the Window
hwnd = CreateWindowEx(
WS_EX_CLIENTEDGE,
g_szClassName,
"The title of my window",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
When I try to compile it (using VS2k5), I get the following errors:
*
1>simplewindow.cpp(40) : error C2440: ‘=’ : cannot convert from ‘const char [14]’ to ‘LPCWSTR’
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>simplewindow.cpp(46) : error C2664: ‘MessageBoxW’ : cannot convert parameter 2 from ‘const char [28]’ to ‘LPCWSTR’
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>simplewindow.cpp(57) : error C2664: ‘CreateWindowExW’ : cannot convert parameter 2 from ‘const char [14]’ to ‘LPCWSTR’
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>simplewindow.cpp(62) : error C2664: ‘MessageBoxW’ : cannot convert parameter 2 from ‘const char [24]’ to ‘LPCWSTR’
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast*
Supposedly, I have to add a capital L before each string, like so: L"bla bla" however, when I do so, I only manage to get this additional error:
simplewindow.cpp(3) : error C2440: ‘initializing’ : cannot convert from ‘const wchar_t [14]’ to ‘const char []’
1> There is no context in which this conversion is possible
**Could anyone explain the problem and how to fix it to me?
Thank you for your time.
Gozu**
ps: Bold added for clarity’s sake. (to make my comments stand out from the code)