输入法编程

开发平台：

Visual C++

myHDC.cpp：源码内容

							/////////////////////////////////////////////////////////////////////////////
// 
#include "stdafx.h"
#include "myHDC.h" 
#include "math.h" 
myHDC::myHDC()
{
	//采用动态连接库方式时，
	//此初始化在第二次时不调用会，最后自己初始化
	hdc=NULL;
	outhdc=NULL;
	bmpBITMAP=NULL;
	outhBMP=NULL;
	Picname[0]=0;
}
myHDC::~myHDC()
{
	DeleteDC(hdc);
	DeleteDC(outhdc);
	DeleteObject(outhBMP);
	DeleteObject(bmpBITMAP);
}
//独立函数,返回为空则为装载失败
HBITMAP myHDC::loadPic(char * myFilename)
{
	if(!strcmp(Picname,myFilename))//相同说明已经装载，则不装并返回
		return bmpBITMAP;
	strcpy(Picname,myFilename);
	DeleteObject(bmpBITMAP);   //
	bmpBITMAP=(HBITMAP)LoadImage(0, myFilename, IMAGE_BITMAP,
				 0,	0,	LR_LOADFROMFILE|LR_CREATEDIBSECTION	);
	if(bmpBITMAP!=NULL)
	{
		DIBSECTION ds;	
		DeleteObject(SelectObject(hdc,bmpBITMAP));
		BITMAPINFOHEADER &bm = ds.dsBmih;
		GetObject(bmpBITMAP,sizeof(ds),&ds);
		LoadPicWidth = bm.biWidth;
		LoadPicHeight = bm.biHeight;
		BitBlt(outhdc,0,0,LoadPicWidth, LoadPicHeight,hdc,0,0,SRCCOPY);
	}
	else
	{
		DeleteObject(bmpBITMAP);
		//MessageBox(0,"没找到!",myFilename,0);
		return NULL;
	}
	return bmpBITMAP;
}
myHDC::reSelectBAKHDC()
{
	DeleteObject(SelectObject(hdc,bmpBITMAP));
}
//一般情况下本函数不会失败,本类必须在调用了此函后才能使用
myHDC ::StartHDC(HDC  pFarHDC,long pFarWidth,long pFarHeight)
{
	if(hdc!=NULL)
	{
		DeleteDC(hdc);
		DeleteObject(outhBMP);
		DeleteObject(bmpBITMAP);
		hdc=NULL;
	}
	hdc=NULL;
	bmpBITMAP=NULL;
	Picname[0]=0;
	Width=pFarWidth;
	Height=pFarHeight;
	outhBMP   =CreateCompatibleBitmap(pFarHDC,Width, Height);
	bmpBITMAP =CreateCompatibleBitmap(pFarHDC,Width, Height);
	hdc       =CreateCompatibleDC(0);
	outhdc    =CreateCompatibleDC(0);
	DeleteObject(SelectObject(hdc,bmpBITMAP));
	BitBlt(hdc,0,0,1000,1000,0,0,0,WHITENESS);
	DeleteObject(SelectObject(outhdc,outhBMP));
}

						