imglib.cpp

上传的是有关mfc的详细介绍

// ImgLib.cpp: implementation of the CImgLib class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ImgLib.h"

#include "ToolKit.h"
#include "ItemKey.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

XMRArray<BitMapCls> CBMPLib::m_arBitMapCls; 

CBMPLib::CBMPLib()
{

}

CBMPLib::~CBMPLib()
{

}

char* CBMPLib::LoadBMP(char *filename, BITMAPINFOHEADER *bmpInfo)
{
	FILE *file = fopen(filename, "rb");
	
	if (!file)
	{
		return NULL;
	}

	BITMAPFILEHEADER bmpFile;

	// 从一个流中读数据
	fread(&bmpFile,sizeof(BITMAPFILEHEADER), 1, file);
	
	if (bmpFile.bfType != 0x4D42)
	{
		fclose(file);
		return NULL;
	}

	fread(bmpInfo, sizeof(BITMAPINFOHEADER), 1, file);

	// 重定位流上的文件指针
	fseek(file, bmpFile.bfOffBits, SEEK_SET);
	
	char *bmpImage = new char[bmpInfo->biSizeImage];

	
	if (!bmpImage)
	{
		delete[] bmpImage;
		fclose(file);
		return NULL;
	}
	
	fread(bmpImage, 1, bmpInfo->biSizeImage, file);
	
	if (!bmpImage)
	{
		delete[] bmpImage;
		bmpImage = NULL;
		fclose(file);
		return NULL;
	}
	
	fclose(file);
	
	return bmpImage;
}

void CBMPLib::LoadBmp(char* strFilePathName,HBITMAP &hBitMap)
{
	BITMAPINFOHEADER bmpInfo;
	char *bmpImage = CBMPLib::LoadBMP(strFilePathName, &bmpInfo);
	if (!bmpImage)
	{
		return ;
	}   
    
	BITMAPINFO dibInfo;  
	dibInfo.bmiHeader					= bmpInfo;
	dibInfo.bmiColors[0].rgbBlue		= 0; 
	dibInfo.bmiColors[0].rgbGreen		= 0;   
	dibInfo.bmiColors[0].rgbRed			= 0;   
	dibInfo.bmiColors[0].rgbReserved	= 0;   
 
	HDC hMemDC = GetDC(NULL);
	
	void *pBuffer;
	hBitMap = CreateDIBSection(hMemDC, 
		(const BITMAPINFO*)&dibInfo, DIB_RGB_COLORS, (void**)&pBuffer, NULL, 0);
	
	CopyMemory(pBuffer, bmpImage, bmpInfo.biSizeImage);

	delete[] bmpImage;
	bmpImage = NULL;
	if (hMemDC)
	{
		ReleaseDC(NULL, hMemDC);
	}
}

void CBMPLib::LoadMap(CString strName,HBITMAP &hBitMap)
{
	strName = ItemKey::RES_FOLDER + strName;
	//static XMRArray<BitMapCls> arBitMapCls; 
	
	int nSize = m_arBitMapCls.GetSize();

	for (int i = 0; i < nSize; i++)
	{
		if (m_arBitMapCls.GetAt(i).m_strKey == strName)
		{
			hBitMap = m_arBitMapCls.GetAt(i).m_HBITMAP;
			return;
		}
	}

	BitMapCls bitMapCls;
	bitMapCls.m_strKey = strName;

	CString strBmpPath, strAppPath;
	ToolKit::GetAppPath(strAppPath);
	strBmpPath.Format("%s%s", strAppPath, strName);

	char* chBmpPath = strBmpPath.GetBuffer(strBmpPath.GetLength());

	//装载前先清空
	hBitMap = NULL;	
	CBMPLib::LoadBmp(chBmpPath, hBitMap);
	
	bitMapCls.m_HBITMAP = hBitMap;
	m_arBitMapCls.Add(bitMapCls);
}