将HICON / HCURSOR复制到字节数组中

Question

有什么方法可以将HICON或HCURSOR转换为 Byte 数组，我用谷歌搜索了所有方式，我没有找到一个通用解决方案，下面我试图将HICON颜色和掩码 BITMAP 转换为字节数组并通过套接字发送并使用CreateIconIndirectAPI 创建我的图标，但如果我可以直接发送HICON，而不是做所有这些事情，这将是好。

int ProcessMouse()
{
BYTE m_hbmMaskBits[70000];
BYTE m_hbmColorBits[70000];
CURSORINFO CursorInfo;
CursorInfo.cbSize = sizeof(CursorInfo);
GetCursorInfo(&CursorInfo);
ICONINFO iconInfo;
if (!GetIconInfo(CursorInfo.hCursor, &iconInfo)) 
{  
MessageBox(NULL, _T("CreateCursor Failed"),_T("message"),MB_OK|MB_SYSTEMMODAL);          
}
bool isColorShape   = (iconInfo.hbmColor != NULL);
bool isMaskShape    = (iconInfo.hbmMask != NULL);
LONG cbSize = 0; int nWidth = 0; int nHeight = 0; int actualHeight = 0; int bmPlanes = 0;
int bmBitsPixel = 0; int xHotspot = 0; int yHotspot = 0; int widthBytes = 0;
// Return width,height,actualheight,bmplanes,bmbitspixel,hotsopt of cursor.
if(!CopyIconInfo(   CursorInfo.hCursor,
nWidth,
nHeight,
actualHeight,
bmPlanes,
bmBitsPixel,
xHotspot,
yHotspot,
widthBytes  ))
{                               
return 0;
}       
std::vector<BYTE> bColor;
std::vector<BYTE> bMask;
int sz_hbmColor         = 0;
int sz_hbmMask          = 0;        
_tempWidth              = nWidth;
_tempHeight             = nHeight;
//If HCURSOR have both color and mask go with regular approach.
if(isColorShape) 
{
//Convert iconInfo.hbmColor HBITMAP to Byte array.
bColor              = HBIMAPtoBYTE(iconInfo.hbmColor,sz_hbmColor);  
//Convert iconInfo.hbmMask HBITMAP to Byte array.            
bMask               = HBIMAPtoBYTE(iconInfo.hbmMask,sz_hbmMask);
}
// If HCURSOR have only mask data go with new approach(split mask bitmap to color and mask).
else if(isMaskShape) 
{
std::vector<BYTE> bSrcBitmap;
int sz_hbmBitmap    = 0;    
//Convert iconInfo.hbmMask HBITMAP to Byte array.        
bSrcBitmap          = HBIMAPtoBYTE(iconInfo.hbmMask,sz_hbmBitmap);
sz_hbmColor         = sz_hbmBitmap/2;
sz_hbmMask          = sz_hbmBitmap/2;
bMask.resize(bMask.size() + sz_hbmBitmap/2);
memcpy(&bMask[bSrcBitmap.size() - sz_hbmBitmap], &bSrcBitmap[0], sz_hbmBitmap/2 * sizeof(BYTE));
bColor.resize(bColor.size() + sz_hbmBitmap/2);
memcpy(&bColor[bSrcBitmap.size() - sz_hbmBitmap], &bSrcBitmap[sz_hbmBitmap/2], sz_hbmBitmap/2 * sizeof(BYTE));
//Clear at end.
bSrcBitmap.clear();
}
try{
err = memcpy_s((m_hbmMaskBits), sz_hbmMask, &(bMask[0]), sz_hbmMask );
err = memcpy_s((m_hbmColorBits),sz_hbmColor,&(bColor[0]),sz_hbmColor);
//Clear at end.
bMask.clear();
bColor.clear();
return 1;
}catch(...) {
if(err) {                   
MessageBox(NULL, _T("memcopy failed at mask or color copy"),_T("message"),MB_OK|MB_SYSTEMMODAL);    
}
}
}

我尝试了以下方式，但它不支持几个单色光标。

PICTDESC pd = {sizeof(pd), PICTYPE_ICON};
pd.icon.hicon = CursorInfo.hCursor;
CComPtr<IPicture> pPict = NULL;
CComPtr<IStream>  pStrm = NULL;
BOOL res = FALSE;
res = SUCCEEDED( ::CreateStreamOnHGlobal(NULL, TRUE, &pStrm) );
res = SUCCEEDED( ::OleCreatePictureIndirect(&pd, IID_IPicture, TRUE, (void**)&pPict) );
res = SUCCEEDED( pPict->SaveAsFile( pStrm, TRUE, &cbSize ) );
if( res )
{
// rewind stream to the beginning
LARGE_INTEGER li = {0};
pStrm->Seek(li, STREAM_SEEK_SET, NULL);
// write to file
DWORD dwWritten = 0, dwRead = 0, dwDone = 0;
while( dwDone < cbSize )
{
if( SUCCEEDED(pStrm->Read(bCursorBuff, sizeof(bCursorBuff), &dwRead)) )
{
dwDone += dwRead;
}
}
_ASSERTE(dwDone == cbSize);
}
//End of Cursor image
pStrm.Release();
pPict.Release();            

Answer 1

HICON和HCURSOR是系统句柄，因此它们仅在当前计算机上工作。

通过网络只能发送实际数据(位图字节(。然后，该机器可以为它创建自己的句柄。

使用 HBITMAP 字节是正确的方法。您可以在此处找到一些详细信息： 如何在VC++中将HICON转换为HBITMAP？

您可以使用 GetDIBits(( 获取原始 HBITMAP 位。详细信息：C++/Win32：如何从 HBITMAP 获取 alpha 通道？

Answer 2

下面的代码仅适用于单色光标用于彩色光标 将 16BPP 位图转换为 32BPP 位图，并使用相同的代码。

bool saveToMemory(HICON hIcon, BYTE* buffer, DWORD& nSize)
{
if (hIcon == 0)
return FALSE;
int * pImageOffset;
int nNumIcons = 1;
nSize = 0;
// copy iconheader first of all
ICONHEADER iconheader;
// Setup the icon header
iconheader.idReserved = 0; // Must be 0
iconheader.idType = 1; // Type 1 = ICON (type 2 = CURSOR)
iconheader.idCount = nNumIcons; // number of ICONDIRs
// save to memory
memcpy(buffer, &iconheader, sizeof(iconheader));
nSize += sizeof(iconheader); // update
//
// Leave space for the IconDir entries
//
nSize += sizeof(ICONDIR);
pImageOffset = (int *)malloc(nNumIcons * sizeof(int));
ICONINFO iconInfo;
BITMAP bmpColor, bmpMask;
GetIconBitmapInfo(hIcon, &iconInfo, &bmpColor, &bmpMask);
// record the file-offset of the icon image for when we write the icon directories
pImageOffset[0] = nSize;
// bitmapinfoheader + colortable
//WriteIconImageHeader(hFile, &bmpColor, &bmpMask);
BITMAPINFOHEADER biHeader;
UINT nImageBytes;
// calculate how much space the COLOR and MASK bitmaps take
nImageBytes = NumBitmapBytes(&bmpColor) + NumBitmapBytes(&bmpMask);
// write the ICONIMAGE to disk (first the BITMAPINFOHEADER)
ZeroMemory(&biHeader, sizeof(biHeader));
// Fill in only those fields that are necessary
biHeader.biSize = sizeof(biHeader);
biHeader.biWidth = bmpColor.bmWidth;
biHeader.biHeight = bmpColor.bmHeight * 2; // height of color+mono  
biHeader.biPlanes = bmpColor.bmPlanes;
biHeader.biBitCount = bmpColor.bmBitsPixel;
biHeader.biSizeImage = nImageBytes;
// write the BITMAPINFOHEADER
//WriteFile(hFile, &biHeader, sizeof(biHeader), &nWritten, 0);
memcpy(&buffer[nSize], &biHeader, sizeof(biHeader));
nSize += sizeof(biHeader);
// save color and mask bitmaps
saveIconData(buffer, nSize, iconInfo.hbmColor);
saveIconData(buffer, nSize, iconInfo.hbmMask);
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
//
// Lastly, save the icon directories.
//
DWORD size = saveIconDirectoryEntry(buffer, sizeof(ICONHEADER), pImageOffset[0], hIcon);
free(pImageOffset);

return TRUE;
}

//
// Return the number of BYTES the bitmap will take ON DISK
//
static UINT NumBitmapBytes(BITMAP *pBitmap)
{
int nWidthBytes = pBitmap->bmWidthBytes;
// bitmap scanlines MUST be a multiple of 4 bytes when stored
// inside a bitmap resource, so round up if necessary
if (nWidthBytes & 3)
nWidthBytes = (nWidthBytes + 4) & ~3;
return nWidthBytes * pBitmap->bmHeight;
}
// same as WriteIconData but save to memory
static UINT saveIconData(BYTE* buffer, DWORD& nSize, HBITMAP hBitmap)
{
BITMAP bmp;
int i;
BYTE * pIconData;
UINT nBitmapBytes;
DWORD nWritten = 0;
GetObject(hBitmap, sizeof(BITMAP), &bmp);
nBitmapBytes = NumBitmapBytes(&bmp);
pIconData = (BYTE *)malloc(nBitmapBytes);
GetBitmapBits(hBitmap, nBitmapBytes, pIconData);
// bitmaps are stored inverted (vertically) when on disk..
// so write out each line in turn, starting at the bottom + working
// towards the top of the bitmap. Also, the bitmaps are stored in packed
// in memory - scanlines are NOT 32bit aligned, just 1-after-the-other
for (i = bmp.bmHeight - 1; i >= 0; i--) 
{
// Write the bitmap scanline
// save to memory
memcpy(&buffer[nSize], pIconData + (i * bmp.bmWidthBytes), bmp.bmWidthBytes);
nSize += bmp.bmWidthBytes;
nWritten += bmp.bmWidthBytes;       
}
free(pIconData);
return nWritten;
}

//
// same as WriteIconDirectoryEntry but save to memory
//
static UINT saveIconDirectoryEntry(BYTE* buffer, DWORD pos, int imageOffset, HICON hIcon)
{
ICONINFO iconInfo;
ICONDIR iconDir;
BITMAP bmpColor;
BITMAP bmpMask;
DWORD nWritten = 0;
UINT nColorCount;
UINT nImageBytes;
GetIconBitmapInfo(hIcon, &iconInfo, &bmpColor, &bmpMask);
nImageBytes = NumBitmapBytes(&bmpColor) + NumBitmapBytes(&bmpMask);
if (bmpColor.bmBitsPixel >= 8)
nColorCount = 0;
else
nColorCount = 1 << (bmpColor.bmBitsPixel * bmpColor.bmPlanes);
// Create the ICONDIR structure
iconDir.bWidth = (BYTE)bmpColor.bmWidth;
iconDir.bHeight = (BYTE)bmpColor.bmHeight;
iconDir.bColorCount = nColorCount;
iconDir.bReserved = 0;
iconDir.wPlanes = bmpColor.bmPlanes;
iconDir.wBitCount = bmpColor.bmBitsPixel;
iconDir.dwBytesInRes = sizeof(BITMAPINFOHEADER) + nImageBytes;
iconDir.dwImageOffset = imageOffset;
// save to memory
memcpy(&buffer[pos], &iconDir, sizeof(iconDir));
nWritten += sizeof(iconDir);
// Free resources
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
return nWritten;
}

Answer 3

我可以通过调用GetDIBits()两次来做到这一点，一次是获取光标图像的实际细节，另一次是获取像素。

您可以将此代码应用于颜色和蒙版，请注意，它只返回 32x32px 光标，也只返回第一帧，即使大小配置为其他内容也是如此。

var windowDeviceContext = User32.GetWindowDC(IntPtr.Zero);
//Initialize the bitmap header and calculate its size.
var maskHeader = new BitmapInfoHeader();
maskHeader.Size = (uint) Marshal.SizeOf(maskHeader);
//Gets the image details.
Gdi32.GetDIBits(windowDeviceContext, iconInfo.Mask, 0, 0, null, ref maskHeader, DibColorModes.RgbColors);
//If there's any data, get it.
if (maskHeader.Height != 0)
{
//To prevent the cursor image from being inverted.
maskHeader.Height *= -1;
var maskBuffer = new byte[maskHeader.SizeImage];
Gdi32.GetDIBits(windowDeviceContext, iconInfo.Mask, 0, (uint) maskHeader.Height, maskBuffer, ref maskHeader, DibColorModes.RgbColors);
}

它是 C#，但可以轻松转换为您选择的语言。