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分享截图功能 的 实现问题
我在网上找了一个截图程序来学习
但是在 winXP 系统下 截取不到 QQ聊天 时 双击聊天栏里图片弹出来的原图查看器:
(QQ截图的效果)
(网上找的截图例子的效果)
为什么中间那块黑色的查看器无法获取到..我在网上找了很多 win32 的截图例子都是这样
附上其中一个我在网上找的截图例子 拷贝屏幕 的代码:
跪求大神 解救
但是在 winXP 系统下 截取不到 QQ聊天 时 双击聊天栏里图片弹出来的原图查看器:
(QQ截图的效果)
(网上找的截图例子的效果)
为什么中间那块黑色的查看器无法获取到..我在网上找了很多 win32 的截图例子都是这样
附上其中一个我在网上找的截图例子 拷贝屏幕 的代码:
HBITMAP CCatchScreenDlg::CopyScreenToBitmap(LPRECT lpRect,BOOL bSave)
//lpRect 代表选定区域
{
HDC hScrDC, hMemDC;
// 屏幕和内存设备描述表
HBITMAP hBitmap, hOldBitmap;
// 位图句柄
int nX, nY, nX2, nY2;
// 选定区域坐标
int nWidth, nHeight;
// 确保选定区域不为空矩形
if (IsRectEmpty(lpRect))
return NULL;
//为屏幕创建设备描述表
hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);
//为屏幕设备描述表创建兼容的内存设备描述表
hMemDC = CreateCompatibleDC(hScrDC);
// 获得选定区域坐标
nX = lpRect->left;
nY = lpRect->top;
nX2 = lpRect->right;
nY2 = lpRect->bottom;
//确保选定区域是可见的
if (nX < 0)
nX = 0;
if (nY < 0)
nY = 0;
if (nX2 > m_xScreen)
nX2 = m_xScreen;
if (nY2 > m_yScreen)
nY2 = m_yScreen;
nWidth = nX2 - nX;
nHeight = nY2 - nY;
// 创建一个与屏幕设备描述表兼容的位图
hBitmap = CreateCompatibleBitmap
(hScrDC, nWidth, nHeight);
// 把新位图选到内存设备描述表中
hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
// 把屏幕设备描述表拷贝到内存设备描述表中
if(bSave)
{
//创建军兼容DC,当bSave为中时把开始保存的全屏位图,按截取矩形大小保存
CDC dcCompatible;
dcCompatible.CreateCompatibleDC(CDC::FromHandle(hMemDC));
dcCompatible.SelectObject(m_pBitmap);
BitBlt(hMemDC, 0, 0, nWidth, nHeight,
dcCompatible, nX, nY, SRCCOPY);
}
else
{
BitBlt(hMemDC, 0, 0, nWidth, nHeight,
hScrDC, nX, nY, SRCCOPY);
}
hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
//得到屏幕位图的句柄
//清除
DeleteDC(hScrDC);
DeleteDC(hMemDC);
if(bSave)
{
if (OpenClipboard())
{
//清空剪贴板
EmptyClipboard();
//把屏幕内容粘贴到剪贴板上,
//hBitmap 为刚才的屏幕位图句柄
SetClipboardData(CF_BITMAP, hBitmap);
//关闭剪贴板
CloseClipboard();
}
}
// 返回位图句柄
return hBitmap;
}
跪求大神 解救
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专写匿名信 2013-10-28
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问题解决了 但是忘了结贴
赵4老师 2013-10-28
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求帖主给我发一份打包好的“截图”项目源代码。zhao4zhong1@163.com
langzi_1949 2013-10-12
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赵老师就是牛啊
碼上道 2013-10-11
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我是来学习的
lazy_virus 2013-10-11
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驾船出海时一定只带一个指南针。 ——学习了！
SKATE11 2013-10-09
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楼主截不到的那张图片可能是直接往显存里面贴的 而你的截屏程序是直接从内存DC上截的吧 比如视频图片你也是截不到的
专写匿名信 2013-10-09
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谢谢赵老师的提醒
赵4老师 2013-10-09
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不要迷信书、考题、老师、回帖；
要迷信CPU、编译器、调试器、运行结果。
并请结合“盲人摸太阳”和“驾船出海时一定只带一个指南针。”加以理解。
任何理论、权威、传说、真理、标准、解释、想象、知识……都比不上摆在眼前的事实！
专写匿名信 2013-10-09
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用这段代码就能在 winXP 上获取到那个QQ的图片查看器么
赵4老师 2013-10-09
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//GDI与DX截屏API操作
LPDIRECTDRAW lpDD = NULL;
LPDIRECTDRAWSURFACE lpDDSPrime = NULL;
LPDIRECTDRAWSURFACE lpDDSBack = NULL;
LPDIRECTDRAWSURFACE lpDDSGdi = NULL;
LPDIRECTDRAWSURFACE lpSurf = NULL;
DDSURFACEDESC DDSdesc;
BOOL m_b24=TRUE;
//rfbServerInitMsg m_scrinfo;
RECT m_bmrect;
struct _BMInfo {
BITMAPINFO bmi ;
BOOL truecolour;
RGBQUAD cmap[256] ;
} m_bminfo; // 用来保存位图信息的结构
int DX_Init() {// DirectX初始化。返回当前表面获取一张屏幕位图的存储空间大小
HRESULT hr;
// 初始化directX
hr = DirectDrawCreate(0, &lpDD, 0);
if (FAILED(hr)) return FALSE;
hr = lpDD->SetCooperativeLevel(NULL, DDSCL_NORMAL);
if (FAILED(hr)) return FALSE;
ZeroMemory(&DDSdesc, sizeof(DDSdesc));
DDSdesc.dwSize = sizeof(DDSdesc);
DDSdesc.dwFlags = DDSD_CAPS;
DDSdesc.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
hr = lpDD->CreateSurface(&DDSdesc, &lpDDSPrime, 0);
if (FAILED(hr)) return FALSE;
hr = lpDD->GetGDISurface(&lpDDSGdi);
if (FAILED(hr)) return FALSE;
ZeroMemory(&DDSdesc, sizeof(DDSdesc));
DDSdesc.dwSize = sizeof(DDSdesc);
DDSdesc.dwFlags = DDSD_ALL;
hr = lpDDSPrime->GetSurfaceDesc(&DDSdesc);
if (FAILED(hr)) return FALSE;
// 初始化位图信息
if ((DDSdesc.dwFlags & DDSD_WIDTH) && (DDSdesc.dwFlags & DDSD_HEIGHT)) {
m_bmrect.left = m_bmrect.top = 0;
m_bmrect.right = DDSdesc.dwWidth;
m_bmrect.bottom = DDSdesc.dwHeight;
} else return FALSE;
m_bminfo.bmi.bmiHeader.biCompression = BI_RGB;//BI_BITFIELDS;
m_bminfo.bmi.bmiHeader.biBitCount = DDSdesc.ddpfPixelFormat.dwRGBBitCount;
// m_bminfo.truecolour = DDSdesc.ddpfPixelFormat.dwFlags & DDPF_RGB;
if (m_bminfo.bmi.bmiHeader.biBitCount > 8)
m_bminfo.truecolour = TRUE;
else
m_bminfo.truecolour = FALSE;
ZeroMemory(&DDSdesc, sizeof(DDSdesc));
DDSdesc.dwSize = sizeof(DDSdesc);
DDSdesc.dwFlags = DDSD_CAPS | DDSD_HEIGHT |DDSD_WIDTH;
DDSdesc.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
DDSdesc.dwHeight = m_bmrect.bottom - m_bmrect.top;
DDSdesc.dwWidth = m_bmrect.right - m_bmrect.left;
hr = lpDD->CreateSurface(&DDSdesc, &lpDDSBack, 0);
if (FAILED(hr)) return FALSE;
// hr = lpDDSPrime->QueryInterface( IID_IDirectDrawSurface3, (LPVOID *)&lpSurf);
// if (FAILED(hr)) return FALSE;
switch (m_bminfo.bmi.bmiHeader.biBitCount) {
case 32:
case 24:
// Update the bitmapinfo header
m_b24 = TRUE;
m_bminfo.bmi.bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
m_bminfo.bmi.bmiHeader.biWidth = 1024;
m_bminfo.bmi.bmiHeader.biHeight = 768;
m_bminfo.bmi.bmiHeader.biPlanes = 1;
// m_bminfo.bmi.bmiHeader.biBitCount = 24;
m_bminfo.bmi.bmiHeader.biCompression = BI_RGB;
m_bminfo.bmi.bmiHeader.biSizeImage = abs((m_bminfo.bmi.bmiHeader.biWidth * m_bminfo.bmi.bmiHeader.biHeight * m_bminfo.bmi.bmiHeader.biBitCount)/8);
m_bminfo.bmi.bmiHeader.biXPelsPerMeter = (1024*1000)/1024;
m_bminfo.bmi.bmiHeader.biYPelsPerMeter = (768*1000)/768;
m_bminfo.bmi.bmiHeader.biClrUsed = 0;
m_bminfo.bmi.bmiHeader.biClrImportant = 0;
break;
}
return m_bminfo.bmi.bmiHeader.biSizeImage;
}
BOOL CaptureScreen(RECT &rect, BYTE *scrBuff, UINT scrBuffSize) {// 捕捉屏幕。rect: 区域。scrBuff: 输出缓冲。scrBuffSize: 缓冲区大小
HRESULT hr=0;
hr = lpDDSBack->BltFast(rect.left,rect.top,lpDDSPrime,&rect,DDBLTFAST_NOCOLORKEY | DDBLTFAST_WAIT);
if (FAILED(hr)) return FALSE;
DDSURFACEDESC surfdesc;
ZeroMemory(&surfdesc, sizeof(surfdesc));
surfdesc.dwSize = sizeof(surfdesc);
hr = lpDDSBack->Lock(&rect, &surfdesc, DDLOCK_READONLY | DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR /*|DDLOCK_NOSYSLOCK*/, NULL);
// hr = lpDDSPrime->Lock(&rect, &surfdesc, DDLOCK_READONLY | DDLOCK_WAIT | DDLOCK_SURFACEMEMORYPTR /*|DDLOCK_NOSYSLOCK*/, NULL);
if (FAILED(hr)) return FALSE;
// copy the data into our buffer
BYTE * destbuffpos, * srcbuffpos;
// m_scrinfo.format.bitsPerPixel = 24;
srcbuffpos = (BYTE *) surfdesc.lpSurface;
destbuffpos = scrBuff;
memcpy( destbuffpos, srcbuffpos,m_bminfo.bmi.bmiHeader.biSizeImage);
// unlock the primary surface
// lpDDSPrime->Unlock(surfdesc.lpSurface);
lpDDSBack->Unlock(surfdesc.lpSurface);
return TRUE;
}
int SaveBitmapToFile(BITMAP *bitmap, LPSTR lpFileName,char *lpBuf) {
DWORD dwWritten;
BITMAPFILEHEADER bmfHdr;
BITMAPINFOHEADER bi;
HANDLE fh=NULL;
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth= bitmap->bmWidth;
bi.biHeight = bitmap->bmHeight;
bi.biPlanes = 1;
bi.biBitCount = bitmap->bmBitsPixel*8;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
fh = CreateFile(lpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE) return FALSE;
bmfHdr.bfType = 0x4D42; // "BM"
bmfHdr.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+bitmap->bmWidth*bitmap->bmHeight*bitmap->bmBitsPixel;
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER);
WriteFile(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
WriteFile(fh, (char *)&bi,sizeof(BITMAPINFOHEADER), &dwWritten, NULL);
WriteFile(fh, (char *)lpBuf,bitmap->bmWidth*bitmap->bmHeight*bitmap->bmBitsPixel, &dwWritten, NULL);
FlushFileBuffers(fh);
CloseHandle(fh);
return true;
}
//(1)获取屏幕绘图设备
//(2)创建一个与屏幕绘图设备相兼容的内存绘图设备
//(2)在内存中创建一个与屏幕绘图设备相兼容的图像对象
//(3)将屏幕设备中的图像复制到内存绘图设备中
//(4)将内存图像保存到文件中
//相关函数：
//GetDIBits:按位的方式返回指定的BITMAP，并按指定的格式存储到内存中
int GetBitmapFromScreen(char *lpFileName) {
char *lpBuf;
HBITMAP hBitmap,hOld ;
HDC hDC,hcDC;
BITMAP bb;
BITMAPINFO b;
HANDLE hp,fh=NULL;
DWORD dwX,dwY;
dwX=GetSystemMetrics(SM_CXSCREEN);
dwY=GetSystemMetrics(SM_CYSCREEN);
hDC=GetDC(NULL);
hcDC=CreateCompatibleDC(hDC);
hBitmap=CreateCompatibleBitmap(hDC,dwX,dwY);
hOld=(HBITMAP)SelectObject(hcDC,hBitmap);
BitBlt(hcDC,0, 0,dwX,dwY, hDC, 0, 0, SRCCOPY);
bb.bmWidth=dwX;
bb.bmHeight =dwY;
bb.bmPlanes = 1;
bb.bmWidthBytes=bb.bmWidth*3;
bb.bmBitsPixel=3;
bb.bmType=0;
b.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
b.bmiHeader.biWidth =dwX;
b.bmiHeader.biHeight =dwY;
b.bmiHeader.biPlanes =1;
b.bmiHeader.biBitCount =3*8;
b.bmiHeader.biCompression =BI_RGB;
b.bmiHeader.biSizeImage =0;
b.bmiHeader.biXPelsPerMeter=0;
b.bmiHeader.biYPelsPerMeter=0;
b.bmiHeader.biClrUsed =0;
b.bmiHeader.biClrImportant =0;
b.bmiColors[0].rgbBlue =8;
b.bmiColors[0].rgbGreen =8;
b.bmiColors[0].rgbRed =8;
b.bmiColors[0].rgbReserved =0;
hp=GetProcessHeap();
lpBuf=(char *)HeapAlloc(hp,HEAP_ZERO_MEMORY,bb.bmHeight*bb.bmWidth*4);
GetDIBits(hcDC,hBitmap,0,dwY,lpBuf,&b,DIB_RGB_COLORS);
SaveBitmapToFile(&bb,lpFileName,lpBuf);
ReleaseDC(NULL,hDC);
DeleteDC(hcDC);
DeleteObject(hBitmap);
DeleteObject(hOld);
HeapFree(hp,0,lpBuf);
return true;
}
5t4rk 2013-10-09
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谢谢赵老师的提醒[/quote]
这才是金玉良言
