DLL - Win32

DLL 탐색 순서

응용프로그램과 같은 디렉토리
현재 작업 디렉토리
시스템 디렉토리
Windows 디렉토리
PATH 환경 변수

LoadLibrary()
LoadLibraryEx()
FreeLibrary()
GetProcAddress()
DisableThreadLibraryCalls()
GetModuleFileHandle()
GetModuleHandle()

#define _WIN32_WINNT 0x0500
#define VC_EXTRALEAN        // Exclude rarely-used stuff from Windows headers
/*
or

#define WS_EX_LAYERED 0x00080000
#define LWA_COLORKEY 0x00000001
#define LWA_ALPHA 0x00000002

extern "C" {
    WINUSERAPI
        BOOL
        WINAPI
        SetLayeredWindowAttributes(
        HWND hwnd,
        COLORREF crKey,
        BYTE bAlpha,
        DWORD dwFlags);
}

*/


    ::SetWindowLong(m_hWnd, GWL_EXSTYLE, GetWindowLong(m_hWnd, GWL_EXSTYLE) ^ WS_EX_LAYERED);
    ::SetLayeredWindowAttributes( m_hWnd, 0, (255 * 70) / 100, LWA_ALPHA);

// 상수 선언
#define WS_EX_LAYERED 0x00080000
#define LWA_ALPHA     0x00000002

// DLL에서 함수를 호출하기 위한 함수 선언
/*
BOOL SetLayeredWindowAttributes(
    HWND hwnd,           // handle to the layered window
    COLORREF crKey,      // specifies the color key
    BYTE bAlpha,         // value for the blend function
    DWORD dwFlags        // action
);
*/
typedef BOOL(WINAPI *SLWA)(HWND, COLORREF, BYTE, DWORD);

// 함수포인터 선언
SLWA pSetLayeredWindowAttributes = NULL;
...
HINSTANCE hmodUSER32 = LoadLibrary("USER32.DLL");
pSetLayeredWindowAttributes =
(SLWA)GetProcAddress(hmodUSER32,"SetLayeredWindowAttributes");
pSetLayeredWindowAttributes(hWnd, 0, 191, LWA_ALPHA);

참조 사이트:

http://batt22.tistory.com/17
http://www.devpia.com/MAEUL/Contents/Detail.aspx?BoardID=51&MAEULNO=20&no=8119&page=3