Vc++打开bmp格式的图像(step-by-step)

一：Vc+打开bmp格式的图像,1.打开MicrosoftVisualc+6.02.按“文件”的“新建”按钮，在菜单栏上的“工程”按钮上选择MFCAppWizad(exe),自己新建一个工程名称,1.在菜单栏上的“查看”上点“建立类向导”，用类向导ClassWizard在Pp.cpp中添加消息事件ID_FILE_OPEN,在/TODO:Addyourcommandhandlercodehere后加上CFileDialogFileDlg(TRUE,*.bmp,NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,_T(Bitmap(*.BMP)|*.BMP|);if(FileDlg.DoModal()=IDOK)CStringcstrFileName=FileDlg.GetPathName();OpenDocumentFile(cstrFileName);,2.在菜单栏上的“查看”上点“建立类向导”，用类向导ClassWizard在Pp.cpp中添加消息响应事件OpenDocumentFile,用类向导ClassWizard在PpDoc.cpp中添加消息响应事件OnOpenDocument，并添加图像处理函数ReadImage,在/TODO:Addyourspecializedcreationcodehere后加上ReadImage(lpszPathName);再在后面加上:BOOLCPpDoc:ReadImage(constchar*szFileName)CFilefile;CFileExceptionfe;intnReadFromFile;longlImageSize;if(!file.Open(szFileName,CFile:modeRead|CFile:shareDenyWrite,调试之后出现了没有定义的错误,所以要在他的头文件PpDoc.h中对函数和变量的申明,用类向导ClassWizard在PpView.cpp中添加绘图消息响应函数OnDraw，用于处理8位和24位数字图像a.在PpView.cpp中添加8位（DisplayBmp8）和24位（DisplayBmp24）数字图像处理函数,voidCPpView:OnDraw(CDC*pDC)CPpDoc*pDoc=GetDocument();ASSERT_VALID(pDoc);/TODO:adddrawcodefornativedatahereif(pDoc-bImageLoaded)if(pDoc-BitCount=8)/8bitDisplayBmp8(pDoc,pDC);else/24bitDisplayBmp24(pDoc,pDC);,voidCPpView:DisplayBmp8(CPpDoc*pDoc,CDC*pDC)CRectrect;CSizesizeTotal;intnColorIndex,i,j,Width;BYTEbtBlue,btGreen,btRed;COLORREFcolor;rect.top=0;rect.left=0;rect.right=pDoc-BmpWidth-1;rect.bottom=pDoc-BmpHeight-1;if(pDoc-BmpWidth%4!=0)Width=(pDoc-BmpWidth/4)+1)*4;elseWidth=pDoc-BmpWidth;for(j=0;jBmpHeight;j+)for(i=0;iBmpWidth;i+)nColorIndex=pDoc-pImagej*Width+i;btBlue=pDoc-pBitMapInfo-bmiColorsnColorIndex.rgbBlue;btGreen=pDoc-pBitMapInfo-bmiColorsnColorIndex.rgbGreen;btRed=pDoc-pBitMapInfo-bmiColorsnColorIndex.rgbRed;color=RGB(btBlue,btGreen,btRed);pDC-SetPixel(i,rect.bottom-j,color);,voidCPpView:DisplayBmp24(CPpDoc*pDoc,CDC*pDC)CRectrect;CSizesizeTotal;inti,j,Width;BYTEbtBlue,btGreen,btRed;COLORREFcolor;rect.top=0;rect.left=0;rect.right=pDoc-BmpWidth-1;rect.bottom=pDoc-BmpHeight-1;if(pDoc-BmpWidth%4!=0)Width=(pDoc-BmpWidth*3/4)+1)*4;elseWidth=pDoc-BmpWidth*3;for(j=0;jBmpHeight;j+)for(i=0;iBmpWidth;i+)btBlue=pDoc-pImagej*Width+i*3;btGreen=pDoc-pImagej*Width+i*3+1;btRed=pDoc-pImagej*Width+i*3+2;color=RGB(btRed,btGreen,btBlue);pDC-SetPixel(i,rect.bottom-j,color);,b调试后出现未定义的错误，DisplayBmp8和DisplayBmp24需在头文件ProjectView.cpp中进行声明,在PpDoc.cpp的构造函数中申请绘图窗口所需的内存空间,在PpDoc.cpp的析造函数中释放申请绘图窗口所需的内存空间,if(bImageLoaded=TRUE)GlobalFree(pImage);LocalFree(pBitMapInfo);,窗口的最大化显示，只要在Pp.cpp中修改ShowWindow的参数,pMainFrameShowWindow(SW_MAXIMIZE);,不打开一个空的窗口，只要调用CCommandLineInfo类的成员函数m_nShellCommand,cmdInfo.m_nShellCommand=CCommandLineInfo:FileNothing;,可以在PpView.cpp的OnInitialUpdate函数中调整窗口大小为图像本身大小,CPpDoc*pDoc=GetDocument();ASSERT_VALID(pDoc);sizeTotal.cy=pDoc-BmpHeight;sizeTotal.cx=pDoc-BmpWidth;SetScrollSizes(MM_TEXT,sizeTotal);ResizeParentToFit(TRUE);,在ChildFrm.cpp的PreCreateWindow函数中可初始化子窗口大小,BOOLCChildFrame:PreCreateWindow(CREATESTRUCT,最终调试后：,二：图像基本信息的获取,LongToString函数的定义,CStringCBaseInfoDlg:LongToString(longdata)CStringstr;intdec,sign;str=_ecvt(data,10,在新建类CBaseInfoDlg添加SetInfo函数,voidCBaseInfoDlg:SetInfo(CMyTestDoc*pDoc)CStringcsTemp;if(pDoc-BitMapFileHeader.bfType=0 x4D42)m_Style=BMP;csTemp=LongToString(pDoc-BitMapFileHeader.bfSize);m_FileSize=csTemp+B;csTemp=LongToString(pDoc-BitMapFileHeader.bfOffBits);m_DataOff=csTemp+-十进制;csTemp=LongToString(pDoc-pBitMapInfo-bmiHeader.biWidth);m_Width=csTemp+像素;csTemp=LongToString(pDoc-pBitMapInfo-bmiHeader.biHeight);m_Height=csTemp+像素;csTemp=LongToString(pDoc-pBitMapInfo-bmiHeader.biBitCount);m_PixelDep=csTemp+bit;,LongToString和SetInfo需在BMPDLG.h中进行定义,public:CBMPDLG(CWnd*pParent=NULL);/standardconstructorCStringLongToString(longdata);voidSetInfo(CPpDoc*pDoc);,在BMPDLG.h中加PpDoc的头文件#include“PpDoc.h”因为有这个申明voidSetInfo(CPpDoc*pDoc);,在PpView.cpp中进行对BMPDLG头文件的定义，添加#includeBMPDLG.h,在PpView.cpp中的voidCPpView:OnBaseinfoInfo()CPpDoc*pDoc=GetDocument();ASSERT_VALID(pDoc);CBMPDLGdlg;/声明类对象dlgdlg.SetInfo(pDoc);/调用CBMPDLG类中的SetInfo函数dlg.DoModal();/显示图像信息对话框,三.直方图,在新建的Dialog中建立类向导HistDlg,在HistDlg.cpp中建立类向导,在OnPaint()函数中写程序,inti,j;if(BitCount=8)long