// ReadBMP.h文件
#include <afxwin.h>
class CMyApp : public CWinApp
{
public:
virtual BOOL InitInstance();
};
class CMainWindow : public CWnd
{
public:
CMainWindow();
protected:
HDC m_hMemDC; // 與客戶區兼容的內存DC句柄
int m_nWidth; // BMP圖像的寬度
int m_nHeight; // BMP圖像的高度
protected:
virtual void PostNcDestroy();
afx_msg BOOL OnCreate(LPCREATESTRUCT);
afx_msg void OnPaint();
afx_msg void OnDestroy();
afx_msg void OnFileOpen();
DECLARE_MESSAGE_MAP()
};
///////////////////////////////////////
// ReadBMP.cpp
#include <afxdlgs.h>
#include "resource.h"
#include "ReadBMP.h"
CMyApp theApp;
BOOL CMyApp::InitInstance()
{
m_pMainWnd = new CMainWindow;
m_pMainWnd->ShowWindow(m_nCmdShow);
return TRUE;
}
CMainWindow::CMainWindow()
{
LPCTSTR lpszClassName = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW,
::LoadCursor(NULL, IDC_ARROW), (HBRUSH)(COLOR_WINDOW+1), theApp.LoadIcon(IDI_MAIN));
CreateEx(NULL, lpszClassName, "BMP文件瀏覽器",
WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION | WS_MINIMIZEBOX,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL);
}
BEGIN_MESSAGE_MAP(CMainWindow, CWnd)
ON_WM_CREATE()
ON_WM_PAINT()
ON_COMMAND(FILE_OPEN, OnFileOpen) // 文件菜單項下的子項“打開”的ID號爲FILE_OPEN
END_MESSAGE_MAP()
void CMainWindow::PostNcDestroy()
{
delete this;
}
BOOL CMainWindow::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
::SetMenu(m_hWnd, ::LoadMenu(theApp.m_hInstance, (LPCTSTR)IDR_MAIN));
CClientDC dc(this);
// 初始化內存DC
m_hMemDC = ::CreateCompatibleDC(dc);
m_nHeight = 0;
m_nWidth = 0;
return TRUE;
}
void CMainWindow::OnPaint()
{
CPaintDC dc(this);
::BitBlt(dc, 0, 0,
m_nWidth, m_nHeight, m_hMemDC, 0, 0, SRCCOPY);
/* CPaintDC dcClient(this);
// 客戶區 DC （目標 DC）
CWindowDC dcWindow(this);
// 整個窗口 DC （源 DC）
// 將窗口左上角30×30大小的圖像拷貝到客戶區
::BitBlt(
dcClient,
// hdcDst 目標 DC
10, // xDst
指定目標 DC 中接受圖像的起始位置（xDst, yDst）
10, // yDst
30, // cx
欲傳輸圖象的寬度（cx）和高度（cy）
30, // cy
dcWindow,
// hdcSrc 源 DC
0, // xSrc
指定源 DC 中要拷貝的圖像的起始座標（xSrc,ySrc）
0, // ySrc
SRCCOPY);
// dwROP 傳輸過程要執行的光柵運算
*/
}
void CMainWindow::OnDestroy()
{
::DeleteDC(m_hMemDC);
}
void CMainWindow::OnFileOpen() // 用戶點擊打開菜單命令時
{
CFileDialog file(TRUE);
if(!file.DoModal())
return;
// 下面是映射BMP文件到內存的過程
// 打開要映射的文件
HANDLE hFile = ::CreateFile(file.GetFileName(), GENERIC_READ,
FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if(hFile == INVALID_HANDLE_VALUE)
{
MessageBox("讀取文件出錯！");
return;
}
// 創建內存映射對象
HANDLE hMap = ::CreateFileMapping(hFile, NULL, PAGE_READONLY, NULL, NULL, NULL);
// 映射整個BMP文件到內存，返回這塊內存的首地址
LPVOID lpBase = ::MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
// 下面是獲取BMP文件信息的過程
BITMAPFILEHEADER *pFileHeader;
// bitmap file-header
BITMAPINFO *pInfoHeader;
// bitmap info-header
// 取得file-header指針，以獲得位圖象素
pFileHeader = (BITMAPFILEHEADER*)lpBase;
if(pFileHeader->bfType != MAKEWORD('B', 'M'))
{
MessageBox("本程序僅讀取BMP文件！");
::UnmapViewOfFile(lpBase);
::CloseHandle(hMap);
::CloseHandle(hFile);
return;
}
BYTE *pBits = (BYTE*)lpBase + pFileHeader->bfOffBits;
// 取得info-header指針，以獲得文件的大小
pInfoHeader = (BITMAPINFO*)((BYTE*)lpBase + sizeof(BITMAPFILEHEADER));
m_nHeight = pInfoHeader->bmiHeader.biHeight;
m_nWidth = pInfoHeader->bmiHeader.biWidth;
// 下面是顯示BMP文件到內存設備的過程
CClientDC dc(this);
// 創建一個與指定DC兼容的未初始化的位圖，選入到內存兼容DC中
HBITMAP hBitmap = ::CreateCompatibleBitmap(dc, m_nWidth, m_nHeight);
::SelectObject(m_hMemDC, hBitmap);
// 把象圖像據放到建立的設備中
int nRet = ::SetDIBitsToDevice(m_hMemDC,
0, // xDest
0, // yDest
m_nWidth,
m_nHeight,
0, // xSrc
0, // ySrc
0, // uStartScan 開始複製的掃描線和要複製的掃描線數
m_nHeight,
// cScanLines
pBits,
// lpvBits 指向DIB中的象素數據部分
pInfoHeader,
// lpbmi 指向BITMAPINFO結構
DIB_RGB_COLORS);
// fuColorUse 指定了DIB中數據的類型
::InvalidateRect(m_hWnd, NULL, TRUE);
::DeleteObject(hBitmap);
::UnmapViewOfFile(lpBase);
::CloseHandle(hMap);
::CloseHandle(hFile);
}
//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by ReadBMP.rc
//
#define IDR_MAIN 101
#define IDI_MAIN 102
#define FILE_OPEN 40001
// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 103
#define _APS_NEXT_COMMAND_VALUE 40002
#define _APS_NEXT_CONTROL_VALUE 1000
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif
//Microsoft Developer Studio generated resource script.
//
#include "resource.h"
#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"
/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
// Chinese (P.R.C.) resources
#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)
#ifdef _WIN32
LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
#pragma code_page(936)
#endif //_WIN32
#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//
1 TEXTINCLUDE DISCARDABLE
BEGIN
"resource.h\0"
END
2 TEXTINCLUDE DISCARDABLE
BEGIN
"#include ""afxres.h""\r\n"
"\0"
END
3 TEXTINCLUDE DISCARDABLE
BEGIN
"\r\n"
"\0"
END
#endif // APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Menu
//
IDR_MAIN MENU DISCARDABLE
BEGIN
POPUP "文件"
BEGIN
MENUITEM "打開", FILE_OPEN
END
END
/////////////////////////////////////////////////////////////////////////////
//
// Icon
//
// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.
IDI_MAIN ICON DISCARDABLE "Tree4.ico"
#endif // Chinese (P.R.C.) resources
/////////////////////////////////////////////////////////////////////////////
#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//
/////////////////////////////////////////////////////////////////////////////
#endif // not APSTUDIO_INVOKED
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