基于MFC的截屏和以位图保存的函数
2008-04-24 20:22
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Vc6中，把如下两个文件拷贝到/工程中，然后在用到截屏的文件中，先#include "takescreen.h"，再直接用
如下三个函数即可。
附：
头文件：takescreen.h
---------------------------------------------------------------------------------------------------------------------------
#if !defined(AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_)
#define AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_
#include "stdafx.h"
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
HBITMAP myGetScreenBmp(CRect &rc);//截屏函数，rc为截屏区域，用屏幕坐标
bool mySaveBitmapToFile(HBITMAP hBitmap , CString lpFileName);//保存位图函数
bool myGetScreenAndSave(CRect rc,CString lpFileName);//相当于前两个函数的综合
#endif // !defined(AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_)
--------------------------------头文件：takescreen.h完毕----------------------------------------------------------
实现文件：takescreen.cpp
------------------------------------------------------------------------------------------------------------------------------
#include "stdafx.h"
#include "takescreen.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
bool mySaveBitmapToFile(HBITMAP hBitmap, CString lpFileName)
{
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
WORD wBitCount;
//位图中每个像素所占字节数
DWORD dwPaletteSize=0,
//定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr;
//位图属性结构
BITMAPINFOHEADER bi;
//位图文件头结构
LPBITMAPINFOHEADER lpbi;
//位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL;
//指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else
{
if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;//原来没有，应有
}
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
if(hDib==NULL)
AfxMessageBox("null");
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_value)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
HBITMAP myGetScreenBmp(CRect &rc)//rc为屏幕坐标，非客户区坐标
{
HWND hwnd = ::GetDesktopWindow();
HDC hsrc = ::GetDC(hwnd);
HDC hmemdc = ::CreateCompatibleDC(hsrc);
rc.NormalizeRect();
SIZE sz;
sz.cx=rc.right-rc.left;
sz.cy=rc.bottom-rc.top;
HBITMAP hbmp = ::CreateCompatibleBitmap(hsrc,sz.cx,sz.cy);
HGDIOBJ holdbmp = ::SelectObject(hmemdc,hbmp);
::BitBlt(hmemdc,0,0,sz.cx,sz.cx,hsrc,rc.left,rc.top,SRCCOPY);
::SelectObject(hmemdc,holdbmp);
::DeleteObject(hmemdc);
::ReleaseDC(hwnd,hsrc);
return hbmp;
}
bool myGetScreenAndSave(CRect rc, CString lpFileName)
{
HWND hwnd = ::GetDesktopWindow();
HDC hsrc = ::GetDC(hwnd);
HDC hmemdc = ::CreateCompatibleDC(hsrc);
rc.NormalizeRect();
SIZE sz;
sz.cx=rc.right-rc.left;
sz.cy=rc.bottom-rc.top;
HBITMAP hbmp = ::CreateCompatibleBitmap(hsrc,sz.cx,sz.cy);
HGDIOBJ holdbmp = ::SelectObject(hmemdc,hbmp);
::BitBlt(hmemdc,0,0,sz.cx,sz.cx,hsrc,rc.left,rc.top,SRCCOPY);
::SelectObject(hmemdc,holdbmp);
::DeleteObject(hmemdc);
::ReleaseDC(hwnd,hsrc);
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
WORD wBitCount;
//位图中每个像素所占字节数
DWORD dwPaletteSize=0,
//定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr;
//位图属性结构
BITMAPINFOHEADER bi;
//位图文件头结构
LPBITMAPINFOHEADER lpbi;
//位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL;
//指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else
if (iBits <= 4)
wBitCount = 4;
else
if (iBits <= 8)
wBitCount = 8;
else
{
if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;//原来没有，应有
}
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hbmp, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
if(hDib==NULL)
AfxMessageBox("null");
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hbmp, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_value)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
如下三个函数即可。
附：
头文件：takescreen.h
---------------------------------------------------------------------------------------------------------------------------
#if !defined(AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_)
#define AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_
#include "stdafx.h"
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
HBITMAP myGetScreenBmp(CRect &rc);//截屏函数，rc为截屏区域，用屏幕坐标
bool mySaveBitmapToFile(HBITMAP hBitmap , CString lpFileName);//保存位图函数
bool myGetScreenAndSave(CRect rc,CString lpFileName);//相当于前两个函数的综合
#endif // !defined(AFX_TAKESCREEN3_H__91B5BB54_7A92_4C2B_B5C3_B227495C32B2__INCLUDED_)
--------------------------------头文件：takescreen.h完毕----------------------------------------------------------
实现文件：takescreen.cpp
------------------------------------------------------------------------------------------------------------------------------
#include "stdafx.h"
#include "takescreen.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
bool mySaveBitmapToFile(HBITMAP hBitmap, CString lpFileName)
{
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
WORD wBitCount;
//位图中每个像素所占字节数
DWORD dwPaletteSize=0,
//定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr;
//位图属性结构
BITMAPINFOHEADER bi;
//位图文件头结构
LPBITMAPINFOHEADER lpbi;
//位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL;
//指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else if (iBits <= 4)
wBitCount = 4;
else if (iBits <= 8)
wBitCount = 8;
else
{
if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;//原来没有，应有
}
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
if(hDib==NULL)
AfxMessageBox("null");
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hBitmap, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_value)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
HBITMAP myGetScreenBmp(CRect &rc)//rc为屏幕坐标，非客户区坐标
{
HWND hwnd = ::GetDesktopWindow();
HDC hsrc = ::GetDC(hwnd);
HDC hmemdc = ::CreateCompatibleDC(hsrc);
rc.NormalizeRect();
SIZE sz;
sz.cx=rc.right-rc.left;
sz.cy=rc.bottom-rc.top;
HBITMAP hbmp = ::CreateCompatibleBitmap(hsrc,sz.cx,sz.cy);
HGDIOBJ holdbmp = ::SelectObject(hmemdc,hbmp);
::BitBlt(hmemdc,0,0,sz.cx,sz.cx,hsrc,rc.left,rc.top,SRCCOPY);
::SelectObject(hmemdc,holdbmp);
::DeleteObject(hmemdc);
::ReleaseDC(hwnd,hsrc);
return hbmp;
}
bool myGetScreenAndSave(CRect rc, CString lpFileName)
{
HWND hwnd = ::GetDesktopWindow();
HDC hsrc = ::GetDC(hwnd);
HDC hmemdc = ::CreateCompatibleDC(hsrc);
rc.NormalizeRect();
SIZE sz;
sz.cx=rc.right-rc.left;
sz.cy=rc.bottom-rc.top;
HBITMAP hbmp = ::CreateCompatibleBitmap(hsrc,sz.cx,sz.cy);
HGDIOBJ holdbmp = ::SelectObject(hmemdc,hbmp);
::BitBlt(hmemdc,0,0,sz.cx,sz.cx,hsrc,rc.left,rc.top,SRCCOPY);
::SelectObject(hmemdc,holdbmp);
::DeleteObject(hmemdc);
::ReleaseDC(hwnd,hsrc);
HDC hDC;
//设备描述表
int iBits;
//当前显示分辨率下每个像素所占字节数
WORD wBitCount;
//位图中每个像素所占字节数
DWORD dwPaletteSize=0,
//定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数
dwBmBitsSize,
dwDIBSize, dwWritten;
BITMAP Bitmap;
BITMAPFILEHEADER bmfHdr;
//位图属性结构
BITMAPINFOHEADER bi;
//位图文件头结构
LPBITMAPINFOHEADER lpbi;
//位图信息头结构
HANDLE fh, hDib, hPal,hOldPal=NULL;
//指向位图信息头结构,定义文件，分配内存句柄，调色板句柄
//计算位图文件每个像素所占字节数
hDC = CreateDC("DISPLAY",NULL,NULL,NULL);
iBits = GetDeviceCaps(hDC, BITSPIXEL) *
GetDeviceCaps(hDC, PLANES);
DeleteDC(hDC);
if (iBits <= 1)
wBitCount = 1;
else
if (iBits <= 4)
wBitCount = 4;
else
if (iBits <= 8)
wBitCount = 8;
else
{
if (iBits <= 24)
wBitCount = 24;
else
wBitCount = 32;//原来没有，应有
}
//计算调色板大小
if (wBitCount <= 8)
dwPaletteSize = (1 << wBitCount) *sizeof(RGBQUAD);
//设置位图信息头结构
GetObject(hbmp, sizeof(BITMAP), (LPSTR)&Bitmap);
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = wBitCount;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwBmBitsSize = ((Bitmap.bmWidth*wBitCount+31)/32)*4*Bitmap.bmHeight;
//为位图内容分配内存
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
if(hDib==NULL)
AfxMessageBox("null");
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
// 处理调色板
hPal = GetStockObject(DEFAULT_PALETTE);
if (hPal)
{
hDC = ::GetDC(NULL);
hOldPal = SelectPalette(hDC, (HPALETTE)hPal, FALSE);
RealizePalette(hDC);
}
// 获取该调色板下新的像素值
GetDIBits(hDC, hbmp, 0, (UINT) Bitmap.bmHeight,
(LPSTR)lpbi + sizeof(BITMAPINFOHEADER)+dwPaletteSize,
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, (HPALETTE)hOldPal, TRUE);
RealizePalette(hDC);
::ReleaseDC(NULL, hDC);
}
//创建位图文件
fh = CreateFile(lpFileName, GENERIC_WRITE,
0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_value)
return FALSE;
// 设置位图文件头
bmfHdr.bfType = 0x4D42; // "BM"
dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) +
dwPaletteSize + dwBmBitsSize;
bmfHdr.bfSize = dwDIBSize;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER)
+ (DWORD)sizeof(BITMAPINFOHEADER)
+ dwPaletteSize;
// 写入位图文件头
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// 写入位图文件其余内容
WriteFile(fh, (LPSTR)lpbi, dwDIBSize,
&dwWritten, NULL);
//消除内存分配
GlobalUnlock(hDib);
GlobalFree(hDib);
CloseHandle(fh);
return TRUE;
}
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