createcompatiblebitmap创建无限长度的画图区域
我用到createcompatiblebitmap创建设备兼容位图,但函数中的参数限制了位图的长度,我想通过循环的方法实现无限长度作图,求代码.... 不现实。。。 w，h的参数是long类型，顶多4G大小而已其次。。。你要保证你的系统内存和显存都要能达到一个地步，足够容纳你要创建的位图大小
创建多幅位图拼接起来不行吗 我想表达的意思就是用两块位图循环使用......但是不知道具体怎样实现 求大神指导啊~~~~~~ 你是要在其内绘制图形？你可以参考数据结构中的循环队列的概念。
定义一个足够大的数组，创建一个足够大的位图。不需要很大，足够即可，比如，你绘制实时曲线，需要显示的范围是30分钟，1000个点，那么也就是大于1000个数据元素，比如1200个，那么你只需要定义一个1200个元素的二维数组，和创建一个能容纳1000个点的位图即可。
问题的关键在于，你需要记录一个开始位置，和一个结束位置，取这两个位置之间的数据来绘制图像。还有一个存储位置，用来指向采集数据存储的位置，这三个位置都遵循，当达到了最大范围就归零，指向数组0的这个位置。
有了这三个位置，就可以实现循环了。 有无相生。
可是要怎样指向位图的开始和结束位置呢?
也许，你需要理解两个概念，一个是内存位图，这相当于一张图纸，比如A1的大图，它绘图总视野总是从左上角开始，到右下角;另一个概念是视野，可能因为图太大，你的视野不能一眼看全整张图，每次视野总是在图上的某个局部，这个视野就是窗口，窗口是实际可见的区域。
如果你在内存绘图后，那么使用Bitblt函数，可以简便的控制希望的视野范围
BitBlt
The BitBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.
BOOL BitBlt(
HDC hdcDest, // handle to destination device context
int nXDest, // x-coordinate of destination rectangle's upper-left
// corner
int nYDest, // y-coordinate of destination rectangle's upper-left
// corner
int nWidth, // width of destination rectangle
int nHeight, // height of destination rectangle
HDC hdcSrc, // handle to source device context
int nXSrc, // x-coordinate of source rectangle's upper-left
// corner
int nYSrc, // y-coordinate of source rectangle's upper-left
// corner
DWORD dwRop // raster operation code
);
Parameters
hdcDest
Handle to the destination device context.
nXDest
Specifies the logical x-coordinate of the upper-left corner of the destination rectangle.
nYDest
Specifies the logical y-coordinate of the upper-left corner of the destination rectangle.
nWidth
Specifies the logical width of the source and destination rectangles.
nHeight
Specifies the logical height of the source and the destination rectangles.
hdcSrc
Handle to the source device context.
nXSrc
Specifies the logical x-coordinate of the upper-left corner of the source rectangle.
nYSrc
Specifies the logical y-coordinate of the upper-left corner of the source rectangle.
dwRop
Specifies a raster-operation code. These codes define how the color data for the source rectangle is to be combined with the color data for the destination rectangle to achieve the final color.
The following list shows some common raster operation codes: Value Description
BLACKNESS Fills the destination rectangle using the color associated with index 0 in the physical palette. (This color is black for the default physical palette.)
DSTINVERT Inverts the destination rectangle.
MERGECOPY Merges the colors of the source rectangle with the specified pattern by using the Boolean AND operator.
MERGEPAINT Merges the colors of the inverted source rectangle with the colors of the destination rectangle by using the Boolean OR operator.
NOTSRCCOPY Copies the inverted source rectangle to the destination.
NOTSRCERASE Combines the colors of the source and destination rectangles by using the Boolean OR operator and then inverts the resultant color.
PATCOPY Copies the specified pattern into the destination bitmap.
PATINVERT Combines the colors of the specified pattern with the colors of the destination rectangle by using the Boolean XOR operator.
PATPAINT Combines the colors of the pattern with the colors of the inverted source rectangle by using the Boolean OR operator. The result of this operation is combined with the colors of the destination rectangle by using the Boolean OR operator.
SRCAND Combines the colors of the source and destination rectangles by using the Boolean AND operator.
SRCCOPY Copies the source rectangle directly to the destination rectangle.
SRCERASE Combines the inverted colors of the destination rectangle with the colors of the source rectangle by using the Boolean AND operator.
SRCINVERT Combines the colors of the source and destination rectangles by using the Boolean XOR operator.
SRCPAINT Combines the colors of the source and destination rectangles by using the Boolean OR operator.
WHITENESS Fills the destination rectangle using the color associated with index 1 in the physical palette. (This color is white for the default physical palette.)
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.
Windows NT: To get extended error information, callGetLastError.
Remarks
If a rotation or shear transformation is in effect in the source device context, BitBlt returns an error. If other transformations exist in the source device context (and a matching transformation is not in effect in the destination device context), the rectangle in the destination device context is stretched, compressed, or rotated as necessary.
If the color formats of the source and destination device contexts do not match, the BitBlt function converts the source color format to match the destination format.
When an enhanced metafile is being recorded, an error occurs if the source device context identifies an enhanced-metafile device context.
Not all devices support the BitBlt function. For more information, see the RC_BITBLT raster capability entry in the GetDeviceCaps function as well as the following functions: MaskBlt, PlgBlt, StretchBlt.
BitBlt returns an error if the source and destination device contexts represent different devices.
ICM: No color management is performed when blits occur.
Windows CE: In Windows CE version 1.0, the dwRop parameter can only be assigned the following values:
SRCCOPY
SRCAND
SRCPAINT
SRCINVERT
In Windows CE version 2.0, the dwRop parameter can be any ROP3.
补充：VB , API
