array[byte] 到 HBITMAP 或 CBitmap [英] array[byte] to HBITMAP or CBitmap

问题描述

我有一个字节数组(我直接从 .bmp 读取流，然后将其作为 BLOB 存储在数据库中)，我想在 CImageList 中显示为图标.因此，我想以某种方式将我的数据加载到 HBITMAP 或 CBitmap 中.到目前为止，我已经这样做了，从文件中读取:

I have an array of bytes (which I read through a stream directly from a .bmp and then store as a BLOB in a database) which I want to display as icons in a CImageList. Therefore I want to somehow load my data into an HBITMAP or CBitmap. I have done it like this up to now, reading from a file:

hPic = (HBITMAP)LoadImage(NULL, strPath, IMAGE_BITMAP, dwWidth, dwHeight, LR_LOADFROMFILE | LR_VGACOLOR);
...
CBitmap bitmap;
bitmap.Attach(hPicRet);

但显然，这只适用于文件，但不适用于字节数组.如何获得相同的结果，但从字节数组中读取?

But obviously, that only works for files, but not for byte-arrays. How can I get the same result, but reading from an array of byte?

请注意，我的数组不仅包含颜色信息，还包含写入磁盘上的完整文件，包括所有标题和元数据.在我看来，丢弃所有这些信息是个坏主意.

Note that my array does not contain just the colour information, but rather the complete file as it is written on disk, including all headers and meta-data. It seems to me that discarding all that information is a bad idea.

推荐答案

假设您已将信息加载到名为 bytes....的 BYTE 数组中.

Assuming you have the information loaded into a BYTE array named bytes....

BITMAPFILEHEADER* bmfh;
bmfh = (BITMAPFILEHEADER*)bytes;

BITMAPINFOHEADER* bmih;
bmih = (BITMAPINFOHEADER*)(bytes + sizeof(BITMAPFILEHEADER));
BITMAPINFO* bmi;
bmi = (BITMAPINFO*)bmih;

void* bits;
bits = (void*)(bytes + bmfh->bfOffBits);

HDC hdc = ::GetDC(NULL);

HBITMAP hbmp = CreateDIBitmap(hdc, bmih, CBM_INIT, bits, bmi, DIB_RGB_COLORS) ;

::ReleaseDC(NULL, hdc);

这有点乱，可以使用大量的错误检查，但基本的想法是合理的.

It's a little messy and could use a hefty dose of error checking, but the basic idea is sound.

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