保存位图出错提示出现在*lpbi = bi; 求帮助
int CjietuView::SaveBitmapToFile(HBITMAP hBitmap, LPCTSTR lpFileName)
{
//int xd=0;
// lpFileName=lpFileName+(++xd);
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
//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
DWORD dwPaletteSize=0,dwBmBitsSize,dwDIBSize, dwWritten;
BITMAP Bitmap;
//位图属性结构
BITMAPFILEHEADER bmfHdr;
//位图文件头结构
BITMAPINFOHEADER bi;
//位图信息头结构
LPBITMAPINFOHEADER lpbi=NULL;
//指向位图信息头结构
HANDLE fh, hDib, hPal;
HPALETTE hOldPal=NULL;
//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(TEXT("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;
//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
/*xxxxxxxx计算位图大小分解一下(解释一下上面的语句)xxxxxxxxxxxxxxxxxxxx
//每个扫描行所占的字节数应该为4的整数倍，具体算法为:
int biWidth = (Bitmap.bmWidth*wBitCount) / 32;
if((Bitmap.bmWidth*wBitCount) % 32)
biWidth++; //不是整数倍的加1
biWidth *= 4;//到这里，计算得到的为每个扫描行的字节数。
dwBmBitsSize = biWidth * Bitmap.bmHeight;//得到大小
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
hDib = GlobalAlloc(GHND,dwBmBitsSize+dwPaletteSize+sizeof(BITMAPINFOHEADER));
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
GlobalLock(lpbi);
*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, (BITMAPINFO *)lpbi,DIB_RGB_COLORS);
//恢复调色板
if (hOldPal)
{
SelectPalette(hDC, 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, sizeof(BITMAPINFOHEADER)+dwPaletteSize+dwBmBitsSize , &dwWritten, NULL);
//清除
GlobalUnlock(hDib);
GlobalFree(hDib);
GlobalUnlock(lpbi);
GlobalFree(lpbi);
CloseHandle(fh);
::EmptyClipboard();
return TRUE;
}
// CjietuView message handlers
int CjietuView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CView::OnCreate(lpCreateStruct) == -1)
return -1;
// TODO: Add your specialized creation code here
// HWND hWnd = ::FindWindow( NULL,_T("jietu"));
// if(hWnd)
// {
// SaveHwndToBmpFile(hWnd, _T("d://1111.bmp"));
// }
SetTimer(NULL,100,NULL);
return 0;
}
void CjietuView::OnTimer(UINT_PTR nIDEvent)
{
// TODO: Add your message handler code here and/or call default
CRect rectT;
GetWindowRect(&rectT);
HBITMAP hMap = CopyScreenToBitmap(rectT);
SaveBitmapToFile(hMap,_T("E:\\trioffer101.bmp"));
//
// HWND hWnd = ::FindWindow( NULL,NULL);
// if(hWnd)
// {
// SaveHwndToBmpFile(hWnd, _T("d://1111.bmp"));
// }
//
CView::OnTimer(nIDEvent);
}
BOOL CjietuView::SaveHwndToBmpFile(HWND hWnd, LPCTSTR lpszPath)
{
// HWND hDesktop = ::GetDesktopWindow();
// //HWND hDesktop = m_hWnd;
// ASSERT(hDesktop);
// if(NULL == hWnd)
// {
// hWnd = hDesktop;
//}
hWnd=m_hWnd;
RECT rect;
::GetWindowRect(hWnd, &rect);
int nWidht = rect.right - rect.left;
int nHeight = rect.bottom - rect.top;
HDC hSrcDC = ::GetWindowDC(hWnd);
ASSERT(hSrcDC);
HDC hMemDC = ::CreateCompatibleDC(hSrcDC);
ASSERT(hMemDC);
HBITMAP hBitmap = ::CreateCompatibleBitmap(hSrcDC, nWidht, nHeight);
ASSERT(hBitmap);
HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hMemDC, hBitmap);
::BitBlt(hMemDC, 0, 0, nWidht, nHeight, hSrcDC, 0, 0, SRCCOPY);
BITMAP bitmap = {0};
::GetObject(hBitmap, sizeof(BITMAP), &bitmap);
BITMAPINFOHEADER bi = {0};
BITMAPFILEHEADER bf = {0};
CONST int nBitCount = 24;
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bitmap.bmWidth;
bi.biHeight = bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = nBitCount;
bi.biCompression = BI_RGB;
DWORD dwSize = ((bitmap.bmWidth * nBitCount + 31) / 32) * 4 * bitmap.bmHeight;
HANDLE hDib = GlobalAlloc(GHND, dwSize + sizeof(BITMAPINFOHEADER));
LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib);
*lpbi = bi;
::GetDIBits(hMemDC, hBitmap, 0, bitmap.bmHeight, (BYTE*)lpbi + sizeof(BITMAPINFOHEADER), (BITMAPINFO*)lpbi, DIB_RGB_COLORS);
try
{
CFile file;
file.Open(lpszPath, CFile::modeCreate | CFile::modeWrite);
bf.bfType = 0x4d42;
dwSize += sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
bf.bfSize = dwSize;
bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
file.Write((BYTE*)&bf, sizeof(BITMAPFILEHEADER));
file.Write((BYTE*)lpbi, dwSize);
file.Close();
}
catch(CFileException* e)
{
e->ReportError();
e->Delete();
}
GlobalUnlock(hDib);
GlobalFree(hDib);
::SelectObject(hMemDC, hOldBitmap);
::DeleteObject(hBitmap);
::DeleteDC(hMemDC);
::ReleaseDC(hWnd, hSrcDC);
//EmptyClipboard();
return TRUE;
}
[解决办法]
用GDI+ 很简单的
#include <atlimage.h>
int SaveBitmapToFile(HBITMAP hBitmap, LPCTSTR lpFileName)
{
CImage image;
image.Attach(hBitmap);
image.Save(lpFileName);
image.Detach();
}
