Question

高手指教，C++window程序 HWND hwnd = CreateWindow();为什么不好转换

#include<Windows.h>

char Name[] = "AdvWin";

LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);
BOOL Register(HINSTANCE hInst);
HWND Create(HINSTANCE hInst, int nCmdShow);

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow)
{
MSG Msg;

if (!Register(hInst))
return FALSE;

if (!Create(hInst, nCmdShow))
return FALSE;

while (GetMessage(&Msg, NULL, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}

BOOL Register(HINSTANCE hInst)
{
WNDCLASS WndClass;

WndClass.style = CS_HREDRAW | CS_VREDRAW;
WndClass.lpfnWndProc = WndProc;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = 0;
WndClass.hInstance = hInst;
WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
WndClass.lpszMenuName = NULL;
WndClass.lpszClassName = L"Name";

return(RegisterClass(&WndClass) != 0);
}

HWND Create(HINSTANCE hInst, int nCmdShow)
{
HWND hwnd = CreateWindow(Name, Name, WS_OVERLAPPEDWINDOW, 10, 10, 600, 400, NULL, NULL, hInst, NULL);
if (hwnd == NULL)
return FALSE;
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);

return hwnd;
}

void my_OnDestroy(HWND hwnd);

LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch (Message)
{
case WM_DESTROY:
my_OnDestroy(hwnd);
break;
default:
return DefWindowProc(hwnd, Message, wParam, lParam);
}
return 0;
}

void my_OnDestroy(HWND hwnd)
{
PostQuitMessage(0);
}
Error C2664 'HWND CreateWindowExW(DWORD,LPCWSTR,LPCWSTR,DWORD,int,int,int,int,HWND,HMENU,HINSTANCE,LPVOID)': cannot convert argument 2 from 'char [7]' to 'LPCWSTR'

Answer 1

提示很清楚了，你不能把char [7]转换成LPCWSTR

LPCWSTR是 const wchar *类型，你得用wchar，字符串要用L""包裹，比如
wchar Name[] = L"AdvWin";

追问

HWND hwnd = CreateWindow(Name, Name, WS_OVERLAPPEDWINDOW, 10, 10, 600, 400, NULL, NULL, hInst, NULL);
这一句怎么改呢？

追答

不用改