VC开发小技巧

十六、另一种改变窗口标题的方法

//使用语句 CWnd* m_pCWnd = AfxGetMainWnd( )，然后，再以如下形式调用SetWindowText()函数：

SetWindowText( *m_pCWnd,(LPCTSTR)m_WindowText);// m_WindowText可以是一个CString类的变量。

十七、剪切板上通过增强元文件拷贝图像数据下面代码拷贝通过元文件拷贝图像数据到任何应用程序，

//其可以放置在CView派生类的函数中。

CMetaFileDC * m_pMetaDC = new CMetaFileDC();

m_pMetaDC->CreateEnhanced(GetDC(),NULL,NULL,"whatever");

//draw meta file

//do what ever you want to do: bitmaps, lines, text...

//close meta file dc and prepare for clipboard;

HENHMETAFILE hMF = m_pMetaDC->CloseEnhanced();

//copy to clipboard

OpenClipboard();

EmptyClipboard();

::SetClipboardData(CF_ENHMETAFILE,hMF);                                                                                

CloseClipboard();

//DeleteMetaFile(hMF);

delete m_pMetaDC;

十八、剪切板上文本数据的传送把文本放置到剪接板上：

CString source;

//put your text in source

if(OpenClipboard())

{

HGLOBAL clipbuffer;

char * buffer;

EmptyClipboard();

clipbuffer = GlobalAlloc(GMEM_DDESHARE, source.GetLength()+1);

buffer = (char*)GlobalLock(clipbuffer);

strcpy(buffer, LPCSTR(source));

GlobalUnlock(clipbuffer);

SetClipboardData(CF_TEXT,clipbuffer);

CloseClipboard();

}

//从剪接板上获取文本：

char * buffer;

if(OpenClipboard())

{

buffer = (char*)GetClipboardData(CF_TEXT);

//do something with buffer here

//before it goes out of scope

}

CloseClipboard();

十九、将捕捉屏幕图像到剪切版中

void CShowBmpInDlgDlg::OnCutScreen()

{

ShowWindow(SW_HIDE);

RECT r_bmp={0,0,::GetSystemMetrics(SM_CXSCREEN),

::GetSystemMetrics(SM_CYSCREEN)};                                                                                      

HBITMAP hBitmap;

hBitmap=CopyScreenToBitmap(&r_bmp);



//hWnd为程序窗口句柄

if (OpenClipboard())

{

EmptyClipboard();

SetClipboardData(CF_BITMAP, hBitmap);

CloseClipboard();

}

ShowWindow(SW_SHOW);

}

HBITMAP CShowBmpInDlgDlg::CopyScreenToBitmap(LPRECT lpRect)

{

//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;

// 位图宽度和高度

int xScrn, yScrn;

// 屏幕分辨率



// 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;

// 获得屏幕分辨率

xScrn = GetDeviceCaps(hScrDC, HORZRES);

yScrn = GetDeviceCaps(hScrDC, VERTRES);

//确保选定区域是可见的

if (nX<0)



nX = 0;

if (nY<0)

nY = 0;

if (nX2>xScrn)

nX2 = xScrn;

if (nY2>yScrn)

nY2 = yScrn;

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

BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);

//得到屏幕位图的句柄

hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);



//清除

DeleteDC(hScrDC);

DeleteDC(hMemDC);

// 返回位图句柄

return hBitmap;

}

}

二十、如何将位图缩放显示在Static控件中

//在Staic控件内显示位图

void CShowBmpInDlgDlg::ShowBmpInStaic()

{

CBitmap hbmp;

HBITMAP hbitmap;

//将pStatic指向要显示的地方

CStatic *pStaic;

pStaic=(CStatic*)GetDlgItem(IDC_IMAGE);

//装载资源 MM.bmp是我的一个文件名，用你的替换

hbitmap=(HBITMAP)::LoadImage (::AfxGetInstanceHandle(),"MM.bmp",

IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION);



hbmp.Attach(hbitmap);

//获取图片格式

BITMAP bm;

hbmp.GetBitmap(&bm);

CDC dcMem;

dcMem.CreateCompatibleDC(GetDC());

CBitmap *poldBitmap=(CBitmap*)dcMem.SelectObject(hbmp);

CRect lRect;

pStaic->GetClientRect(&lRect);

//显示位图

pStaic->GetDC()->StretchBlt(lRect.left ,lRect.top ,lRect.Width(),lRect.Height(),

&dcMem,0 ,0,bm.bmWidth,bm.bmHeight,SRCCOPY);

dcMem.SelectObject(&poldBitmap);

}

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