异性窗口 (解决SetLayeredWindowAttributes函数未定义的问题)

 
#include <windows.h>

#include <WinUser.h>
#include <stdio.h>
//#include "resource.h"
//#include <afxwin.h>
#include <math.h>

#define TWO_PI (2.0*3.1415926)

 #define WS_EX_LAYERED 0x00080000
 #define LWA_COLORKEY  0x00000001

LRESULT CALLBACK MyWindowProc(
							  HWND hwnd, 
							  UINT uMsg, 
							  WPARAM wParam, 
							  LPARAM lParam 
							  ); 
void DrawRectangle(HWND hwnd);
int cxClient,cyClient;
typedef 
BOOL (WINAPI  *LP_SetLayeredWindowAttributes)(
									  HWND hwnd,           // handle to the layered window
									  COLORREF crKey,      // specifies the color key
									  BYTE bAlpha,         // value for the blend function
									  DWORD dwFlags        // action
									  );//注意添加WINAPI,定义成C++约定，否则报错崩溃
int WINAPI WinMain(  HINSTANCE hInstance,  HINSTANCE hPrevInstance, LPSTR lpCmdLine,  int nShowCmd )
{
	HWND hwnd;
	WNDCLASS wndclass;
	MSG msg;
	static TCHAR MyAppName[]=TEXT("My first windows app");


	//设置窗口背景画刷为图片画刷，再指定透明颜色即可以创建透明区域。
	HBITMAP  hBitmap;
	hBitmap = (HBITMAP)LoadImage(NULL, TEXT("Kitty.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
	if (hBitmap == NULL)
	{
		MessageBox(NULL, TEXT("位图加载失败"), TEXT("Error"), MB_ICONERROR);
		return 0;
	}


	wndclass.style=CS_HREDRAW|CS_VREDRAW;
	wndclass.lpfnWndProc=MyWindowProc;
	wndclass.cbClsExtra=0;//预留的额外空间
	wndclass.cbWndExtra=0;
	wndclass.hInstance=hInstance;
	wndclass.hIcon=::LoadIcon(NULL,IDI_INFORMATION);
	wndclass.hCursor=::LoadCursor(NULL,IDC_ARROW);//::LoadCursor(hInstance,MAKEINTRESOURCE(IDC_CURSOR1));
	wndclass.hbrBackground=CreatePatternBrush(hBitmap);//(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.lpszMenuName=NULL;
	wndclass.lpszClassName=TEXT("My first windows app");
	if (!RegisterClass(&wndclass))
	{
		int i=GetLastError();
		//char str[25]={0};
		wchar_t chResult[128]={0};
		_itow(i,chResult,10);
		//sprintf(str,TEXT("%d"),i);
		//sprintf(buffer,L"Key State = 0X%X  ",key_state);
		MessageBox(NULL,chResult,TEXT("Error"),MB_OK);
		//AfxMessageBox(TEXT("Error") );
	}
	//hwnd=CreateWindow( MyAppName,
	//	TEXT("My first windows"),
	//	WS_OVERLAPPEDWINDOW|WS_VSCROLL|WS_HSCROLL,
	//	CW_USEDEFAULT ,
	//	CW_USEDEFAULT,
	//	CW_USEDEFAULT,
	//	CW_USEDEFAULT,
	//	NULL,NULL,
	//	hInstance,
	//	NULL
	//	);
	BITMAP bm;
	GetObject(hBitmap, sizeof(bm), &bm);
	hwnd = CreateWindowEx(WS_EX_TOPMOST,
		MyAppName,
		MyAppName, 
		WS_POPUP,
		CW_USEDEFAULT, 
		CW_USEDEFAULT, 
		bm.bmWidth, 
		bm.bmHeight,
		NULL,
		NULL,
		hInstance,
		NULL);
	//ShowWindow(hwnd,SW_SHOWNORMAL); 
	ShowWindow(hwnd,nShowCmd);
	UpdateWindow(hwnd);
	while(TRUE)
	{
		if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
		{
			if(msg.message==WM_QUIT)
				break;
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
		else
			DrawRectangle(hwnd);
	}
	
	return msg.wParam;
}
LRESULT CALLBACK MyWindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
	static HRGN hRgnClip,hRgnClip1;
	//static int cxClient,cyClient;
	double fAngle,fRadius;
	HCURSOR hCursor;
	HDC hdc;
	HRGN hRgnTem[6];
	int i;
	PAINTSTRUCT ps;
	RECT WindowsRect;

	HFONT      hFont ;
	LOGFONT    lf ;
	HRGN  rgnWnd,rgnTemp;
	static HDC s_hdcMem;
	static HBRUSH s_hBackBrush;
	switch(uMsg)
	{
	case WM_CREATE:
		{

			// 设置分层属性
			SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE)|WS_EX_LAYERED);
			 //设置透明色
			COLORREF clTransparent = RGB(0, 0, 0);
			LP_SetLayeredWindowAttributes MySetLayeredWindowAttributes = (LP_SetLayeredWindowAttributes)GetProcAddress(LoadLibrary(TEXT("user32.dll")),"SetLayeredWindowAttributes");
			MySetLayeredWindowAttributes(hwnd, clTransparent, 0, LWA_COLORKEY);
		}
		return 0;
	case WM_KEYDOWN: 
		switch (wParam)
		{
		case VK_ESCAPE: //按下Esc键时退出
			SendMessage(hwnd, WM_DESTROY, 0, 0);
			return 0;
		}
		break;


	case WM_LBUTTONDOWN: //当鼠标左键点击时可以拖曳窗口
		PostMessage(hwnd, WM_SYSCOMMAND, SC_MOVE | HTCAPTION, 0); 
		return 0;


	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
void DrawRectangle(HWND hwnd)
{
	//RECT rect;
	//HBRUSH hBrush;
	//if (cxClient==0||cyClient==0)
	//{
	//	return;
	//}
	//SetRect(&rect,rand()%cxClient,rand()%cyClient,rand()%cxClient,rand()%cyClient);
	//hBrush=CreateSolidBrush(RGB(rand()%256,rand()%256,rand()%256));
	//HDC hdc=GetDC(hwnd);
	//FillRect(hdc,&rect,hBrush);
	//ReleaseDC(hwnd,hdc);
	//DeleteObject(hBrush);
}
void GetWindowSize(HWND hwnd, int *pnWidth, int *pnHeight)
{
	RECT rc;
	GetWindowRect(hwnd, &rc);
	*pnWidth = rc.right - rc.left;
	*pnHeight = rc.bottom - rc.top;
}