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1、創(chuàng)建一個(gè)基于對(duì)話框的MFC EXE

2、在對(duì)話框的 OnInitDialog 函數(shù) 中，設(shè)置對(duì)話框擴(kuò)展屬性 為：WS_EX_LAYERED

const WS_EX_LAYERED = 0x80000;

::SetWindowLong(GetSafeHwnd(),GWL_EXSTYLE,
GetWindowLong(GetSafeHwnd(),GWL_EXSTYLE)|WS_EX_LAYERED);

3、在對(duì)話框的 OnInitDialog 函數(shù) 中，設(shè)置對(duì)話框透明

HINSTANCE hInst;

const LWA_COLORKEY = 0x00001;
const LWA_ALPHA = 0x00002;

typedef BOOL (WINAPI *FSetLayeredWindowAttributes)(HWND,COLORREF,BYTE,DWORD);
FSetLayeredWindowAttributes SetLayeredWindowAttributes;

hInst = LoadLibrary("User32.dll");

SetLayeredWindowAttributes = (FSetLayeredWindowAttributes)
   GetProcAddress(hInst,"SetLayeredWindowAttributes");

SetLayeredWindowAttributes(GetSafeHwnd(),RGB(0,0,0),150,LWA_ALPHA);

FreeLibrary(hInst);