能说明一下CreateDIBSection函数的用法吗？(50分)

能能说明一下下面函数的用法吗<br>HBITMAP CreateDIBSection(<br>&nbsp; &nbsp; HDC hdc, // handle to device context<br>&nbsp; &nbsp; CONST BITMAPINFO *pbmi, // pointer to structure containing bitmap size, format, and color data<br>&nbsp; &nbsp; UINT iUsage, // color data type indicator: RGB values or palette indices<br>&nbsp; &nbsp; VOID *ppvBits, // pointer to variable to receive a pointer to the bitmap's bit values<br>&nbsp; &nbsp; HANDLE hSection, // optional handle to a file mapping object<br>&nbsp; &nbsp; DWORD dwOffset // offset to the bitmap bit values within the file mapping object<br>&nbsp; &nbsp;<br>最好能有一个例子

我有一图形文件的裸数据文件，如何生成图形文件，请给出一个例子

没人知道如何将裸图形数据文件，显示在TImage中吗？<br>如有人能解决我再加100分

bits : Pointer; <br>Bitmapinfo : PBitmapinfo; <br><br>Bitmap := CreateDIBSection(ACanvas.Handle,Bitmapinfo^,DIB_RGB_COLORS,bits,nil,0); <br><br>Even if you specify BI_RGB in a call to CreateDIBSection, it can return a DIB <br>with BI_BITFIELDS compression, for 16 (and 32 bit) bitmaps (!!!)

To YB_unique<br>&nbsp; &nbsp;能解释一下吗？<br>&nbsp; &nbsp;最好能有一个例子将图形文件显示到TImage中

CreateDIBSection创建了一个以兼容DC为基础的HBITMAP句柄。<br>在函数LoadBitmap中首先从指定文件名的文件中读取以结构BITMAPFILEHEADER为大小的数据块，<br>然后由文件头标志判断文件是否为BMP位图文件，然后由BITMAPFILEHEADER中bfSize保存的文件大小与文件的真实大小比较文件是否有损坏，<br>再由BITMAPFILEHEADER中bfOffBits与BITMAPFILEHEADER结构大小相减计算出位图信息头和颜色表一共的大小，<br>动态申请一块空间保存位图信息头和颜色表信息，再由BITMAPFILEHEADER中bfSize与bfOffBits相减计算出DIB位图数据的大小，<br>动态申请一块空间保存DIB位图数据，最后调用成员函数CreateBitmapIndirect来创建DIB位图。 <br><br>CreateDIBSection is which not only creates the appropriate structure and handle, <br>but also provides the address of the DIB's pixel array.<br>Functions such as StretchDIBits can then be used to map the resulting bitmap on to any canvas.

其实你也可以使用API函数GlobalAlloc分配内存并创建HDIB位图句柄，这样所有操作直接读写内存，<br>然后通过StrechDIBits及SetDIBsToDevice函数来显示。

YB_unique<br>非常感谢您，但我对图形编程不是很清楚，<br>你能否给出一个实际的例子让我看看是如何生成图形的。<br>此处50分，另再加100分一分都不会少您的

你没必要这么做，这样你就可以把24bits彩色的裸图数据显示了。<br>&nbsp; &nbsp; &nbsp;BITMAPINFO bmi;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biSize &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= sizeof(BITMAPINFOHEADER);<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biCompression &nbsp; &nbsp; = BI_RGB;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biWidth &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = Width;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biHeight &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= Height;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biPlanes &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 1;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biBitCount &nbsp; &nbsp; &nbsp; &nbsp;= 24;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biSizeImage &nbsp; &nbsp; &nbsp; = Width*Height*3;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biXPelsPerMeter &nbsp; = 0;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biYPelsPerMeter &nbsp; = 0;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biClrUsed &nbsp; &nbsp; &nbsp; &nbsp; = 0;<br>&nbsp; &nbsp; &nbsp;bmi.bmiHeader.biClrImportant &nbsp; &nbsp;= 0;<br>&nbsp; &nbsp; &nbsp;byte* &nbsp;picData = ....(你的数据区)<br>&nbsp; &nbsp; StretchDIBits(Image1-&gt;Canvas-&gt;Handle,<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0, 0, 352, 288,<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0, 0, 352, 288,<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; picData, &amp;bmi, 0, SRCCOPY);<br>

为什么不用TBitmap?可以试一下下面的代码。<br>在窗体上放一个Imange,并在一个按钮的OnClick中加入下面代码：<br>var<br>&nbsp; Bitmap:TBitmap;<br>begin<br>&nbsp; Bitmap:=TBitmap.Create;<br>&nbsp; Bitmap.LoadFromFile('C:/Windows/Bubbles.bmp');// 或其它位图文件<br>&nbsp; Image1.Picture.Bitmap.Assign(Bitmap);<br>&nbsp; Bitmap.Destroy;<br>end;<br>而且Tbitmap中有很多控制图形的属性.

多人接受答案了。