MFC编程介绍

MFC编程介绍

1.MFC中设置字体
由于MFC中只能在属性里设置整个对话框的字体，而不能对某一个具体的控件设置
所以，必须编程来实现。

2. 不规则窗口的创建方法, 按位图生成不规则窗口

CRect rect;
GetWindowRect(&rect); // 获取窗口矩形框
CRgn rgn; // 构造自己的RGN
rgn.CreateRoundRectRgn(0,0,rect.Width(),rect.Height(), 5,5);
this->SetWindowRgn((HRGN) rgn.GetSafeHandle(),true);

RGN可以自由构造，最后你要做的只是调用SetWindowRgn这个函数来设置窗口的范围;

你还可以使用一幅位图来作为生成这个窗口RGN的依据 . 这里提供一个函数, 来自CODEPROJECT. 它有3个参数 第一个hBmp是位图的句柄, 第二个是掩码色, 第三个表示掩码色上下可浮动的范围(这个范围内都不创建RGN); 不过要提醒的是, 这个函数在使用时RGB颜色是相反的(比如RGB(255,0,0)应该表示的是红色, 使用该函数十却是将蓝色区域排除), 所以最好是使用RGB(255,0,255)作为掩码色, 那么就无所谓了.

你可以在PreSubClassWindow函数里调用这个函数, 并调用如下函数实现不规则的窗口, 至于下一步要不要贴图
就看你自己了, 反正窗口是生成了;
SetWindowRgn(rgn, TRUE );
ModifyStyle(0, BS_OWNERDRAW);

//
//BitmapToRegion :Create a region from the "non-transparent" pixels of a bitmap
//Author :Jean-Edouard Lachand-Robert (http://www.geocities.com/Paris/LeftBank/1160/resume.htm), June 1998.
//
//hBmp :Source bitmap
//cTransparentColor :Color base for the "transparent" pixels (default is black)
//cTolerance :Color tolerance for the "transparent" pixels.
//
//A pixel is assumed to be transparent if the value of each of its 3 components (blue, green and red) is
//greater or equal to the corresponding value in cTransparentColor and is lower or equal to the
//corresponding value in cTransparentColor + cTolerance.
//
HRGN BitmapToRegion (HBITMAP hBmp, COLORREF cTransparentColor = 0, COLORREF cTolerance = 0x101010)
{
HRGN hRgn = NULL;

if (hBmp)
{
// Create a memory DC inside which we will scan the bitmap content
HDC hMemDC = CreateCompatibleDC(NULL);
if (hMemDC)
{
// Get bitmap size
BITMAP bm;
GetObject(hBmp, sizeof(bm), &bm);

// Create a 32 bits depth bitmap and select it into the memory DC
BITMAPINFOHEADER RGB32BITSBITMAPINFO = {
sizeof(BITMAPINFOHEADER),// biSize
bm.bmWidth,// biWidth;
bm.bmHeight,// biHeight;
1,// biPlanes;
32,// biBitCount
BI_RGB,// biCompression;
0,// biSizeImage;
0,// biXPelsPerMeter;
0,// biYPelsPerMeter;
0,// biClrUsed;
0// biClrImportant;
};
VOID * pbits32;
HBITMAP hbm32 = CreateDIBSection(hMemDC, (BITMAPINFO *)&RGB32BITSBITMAPINFO, DIB_RGB_COLORS, &pbits32, NULL, 0);
if (hbm32)
{
HBITMAP holdBmp = (HBITMAP)SelectObject(hMemDC, hbm32);

// Create a DC just to copy the bitmap into the memory DC
HDC hDC = CreateCompatibleDC(hMemDC);
if (hDC)
{
// Get how many bytes per row we have for the bitmap bits (rounded up to 32 bits)
BITMAP bm32;
GetObject(hbm32, sizeof(bm32), &bm32);
while (bm32.bmWidthBytes % 4)
bm32.bmWidthBytes++;

// Copy the bitmap into the memory DC
HBITMAP holdBmp = (HBITMAP)SelectObject(hDC, hBmp);
BitBlt(hMemDC, 0, 0, bm.bmWidth, bm.bmHeight, hDC, 0, 0, SRCCOPY);

// For better performances, we will use the ExtCreateRegion() function to create the
// region. This function take a RGNDATA structure on entry. We will add rectangles by
// amount of ALLOC_UNIT number in this structure.
#define ALLOC_UNIT100
DWORD maxRects = ALLOC_UNIT;
HANDLE hData = GlobalAlloc(GMEM_MOVEABLE, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects));
RGNDATA *pData = (RGNDATA *)GlobalLock(hData);
pData->rdh.dwSize = sizeof(RGNDATAHEADER);
pData->rdh.iType = RDH_RECTANGLES;
pData->rdh.nCount = pData->rdh.nRgnSize = 0;
SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);

// Keep on hand highest and lowest values for the "transparent" pixels
BYTE lr = GetRValue(cTransparentColor);
BYTE lg = GetGValue(cTransparentColor);
BYTE lb = GetBValue(cTransparentColor);
BYTE hr = min(0xff, lr + GetRValue(cTolerance));
BYTE hg = min(0xff, lg + GetGValue(cTolerance));
BYTE hb = min(0xff, lb + GetBValue(cTolerance));

// Scan each bitmap row from bottom to top (the bitmap is inverted vertically)
BYTE *p32 = (BYTE *)bm32.bmBits + (bm32.bmHeight - 1) * bm32.bmWidthBytes;

for (int y = 0; y < bm.bmHeight; y++)
{
// Scan each bitmap pixel from left to right
for (int x = 0; x < bm.bmWidth; x++)
{
// Search for a continuous range of "non transparent pixels"
int x0 = x;
LONG *p = (LONG *)p32 + x;
while (x < bm.bmWidth)
{
BYTE b = GetRValue(*p);
if (b >= lr && b <= hr)
{
b = GetGValue(*p);
if (b >= lg && b <= hg)
{
b = GetBValue(*p);
if (b >= lb && b <= hb)
// This pixel is "transparent"
break;
}
}
p++;
x++;
}

if (x > x0)
{
// Add the pixels (x0, y) to (x, y+1) as a new rectangle in the region
if (pData->rdh.nCount >= maxRects)
{
GlobalUnlock(hData);
maxRects += ALLOC_UNIT;
hData = GlobalReAlloc(hData, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), GMEM_MOVEABLE);
pData = (RGNDATA *)GlobalLock(hData);
}
RECT *pr = (RECT *)&pData->Buffer;
SetRect(&pr[pData->rdh.nCount], x0, y, x, y+1);
if (x0 < pData->rdh.rcBound.left)
pData->rdh.rcBound.left = x0;
if (y < pData->rdh.rcBound.top)
pData->rdh.rcBound.top = y;
if (x > pData->rdh.rcBound.right)
pData->rdh.rcBound.right = x;
if (y+1 > pData->rdh.rcBound.bottom)
pData->rdh.rcBound.bottom = y+1;
pData->rdh.nCount++;

// On Windows98, ExtCreateRegion() may fail if the number of rectangles is too
// large (ie: > 4000). Therefore, we have to create the region by multiple steps.
if (pData->rdh.nCount == 2000)
{
HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
if (hRgn)
{
CombineRgn(hRgn, hRgn, h, RGN_OR);
DeleteObject(h);
}
else
hRgn = h;
pData->rdh.nCount = 0;
SetRect(&pData->rdh.rcBound, MAXLONG, MAXLONG, 0, 0);
}
}
}

// Go to next row (remember, the bitmap is inverted vertically)
p32 -= bm32.bmWidthBytes;
}

// Create or extend the region with the remaining rectangles
HRGN h = ExtCreateRegion(NULL, sizeof(RGNDATAHEADER) + (sizeof(RECT) * maxRects), pData);
if (hRgn)
{
CombineRgn(hRgn, hRgn, h, RGN_OR);
DeleteObject(h);
}
else
hRgn = h;

// Clean up
GlobalFree(hData);
SelectObject(hDC, holdBmp);
DeleteDC(hDC);
}

DeleteObject(SelectObject(hMemDC, holdBmp));
}

DeleteDC(hMemDC);
}
}

return hRgn;
}