thebitmap.cpp

关于在设备上建立位图的相关函数的使用与讲解

#include <Windows.h>
#include "TheBitMap.h"
const struct MessageDo myMSG[]={
	WM_CREATE,DoCreate,
	WM_PAINT,DoPaint,
	WM_DESTROY,DoDestroy,
};
const TCHAR winName[]=TEXT("bitmap");
BYTE bitData[48*48*3];
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPWSTR lpCmdLine,int nShowCmd)
{
	MSG msg;
	HWND hWnd = InitApp(hInstance,lpCmdLine,nShowCmd);
	if(!IsWindow(hWnd)) return 0;
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return TermApp(hInstance,msg.wParam);
}
HWND InitApp(HINSTANCE hInstance,LPWSTR lpCmdLine,int nShowCmd)
{
	WNDCLASS wc;
	HWND hWnd;
#if defined(WIN32_PLATFORM_PSPC)
	hWnd=FindWindow(winName,NULL);
	if(hWnd)
	{
		SetForegroundWindow((HWND)(((DWORD)hWnd)|0x10));
		return 0;
	}
#endif
	wc.style=0;
	wc.cbClsExtra=0;
	wc.cbWndExtra=0;
	wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wc.hCursor=LoadCursor(NULL,IDC_ARROW);
	wc.hIcon=NULL;
	wc.hInstance=hInstance;
	wc.lpfnWndProc=MainWndProc;
	wc.lpszClassName=winName;
	wc.lpszMenuName=NULL;
	if(RegisterClass(&wc)==0) return 0;
	hWnd=CreateWindow(winName,
		TEXT("位图处理示例"),
		WS_BORDER|WS_CAPTION|WS_SYSMENU,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL);
	if(!IsWindow(hWnd)) return 0;
	ShowWindow(hWnd,nShowCmd);
	UpdateWindow(hWnd);
	return hWnd;
}
int TermApp(HINSTANCE hInstance,int nDefRec)
{
	return nDefRec;
}
LRESULT CALLBACK MainWndProc(HWND hWnd,UINT wMsg,WPARAM wParam,LPARAM lParam)
{
	for(int i=0;i<dim(myMSG);i++)
	{
		if(wMsg==myMSG[i].code)
		{
			return (*myMSG[i].Fxn)(hWnd,wMsg,wParam,lParam);
		}
	}
	return DefWindowProc(hWnd,wMsg,wParam,lParam);
}
LRESULT DoCreate(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	memset(bitData,0x7f,sizeof(bitData));
	return 0;
}
LRESULT DoPaint(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	HBITMAP htp;
	PAINTSTRUCT ps;
	RECT rect;
	HDC hdc,hdcMemo;
	GetClientRect(hWnd,&rect);
	//获取当前图形显示设备对象
	hdc = BeginPaint(hWnd,&ps);
	//创建一个虚拟设备显示对像
	hdcMemo=CreateCompatibleDC(hdc);
	//建立设备相关位图对像
	//两者都是创建设备相关位图，返回hbitmap位图对象
	//不通之处在于，createbitmap返回根据位图格式设定的位图对象
	//createcompatiblebitmap返回的是当前设备色置相关的位图对象
	//htp=CreateBitmap(48,48,1,24,bitData);
	htp=CreateCompatibleBitmap(hdc,40,40);
	DrawText(hdc,TEXT("位图示例"),-1,&rect,DT_CENTER);
	//将设备相关位图对象设进虚拟设备显示对象
	SelectObject(hdcMemo,htp);
	//转换虚拟设备显示对象到当前设备显示
	BitBlt(hdc,20,20,48,48,hdcMemo,0,0,SRCCOPY); 
	//清理
	DeleteDC(hdcMemo);
	EndPaint(hWnd,&ps);
	return 0;
}
LRESULT DoDestroy(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	PostQuitMessage(0);
	return 0;
}