How to get icon bitmap from HICON?

[szyk...@gmail.com]

Hi
I am writting program which must extract bitmap icons from Windows with WinApi. Next I will cache them and display with custom library. For now I have simple code (in C++ but it is very simple). But I don't know what to do with HICON - I don't find any function in WinApi which can extract icon from HICON handle. So maybe is there other way?
My current code is like this:
wchar_t* lFile = new wchar_t[lItem->fileName().size() + 1];
lItem->fileName().toWCharArray(lFile);
lFile[lItem->fileName().size()] = 0;
SHFILEINFOW lFileInfo;
HICON lIcon = SHGetFileInfo(lFile, FILE_ATTRIBUTE_NORMAL, &lFileInfo, sizeof(SHFILEINFO), SHGFI_USEFILEATTRIBUTES | SHGFI_ICON | SHGFI_SMALLICON);
delete [] lFile;
lFile = 0;

If you can tell me where is better group or forum to post this message please let me know.

thanks and best regards
Szyk Cech

[Rick C. Hodgin]

See for several related algorithms:

https://msdn.microsoft.com/en-us/library/windows/desktop/dd162950(v=vs.85).aspx

Thank you,
Rick C. Hodgin

[Christian Astor]

szyk...@gmail.com a écrit :

> I am writting program which must extract bitmap icons from Windows with WinApi. Next I will cache them and display with custom library. For now I have simple code (in C++ but it is very simple). But I don't know what to do with HICON - I don't find any function in WinApi which can extract icon from HICON handle. So maybe is there other way?

Use GetIconInfo()

or with an ImageList(ImageList_Create(), ImageList_AddIcon(),
ImageList_Draw())

[Christian Astor]

Christian Astor a écrit :

> Use GetIconInfo()
>
> or with an ImageList(ImageList_Create(), ImageList_AddIcon(),
> ImageList_Draw())

...or DrawIcon(Ex) in a DC.

[szyk...@gmail.com]

> ...or DrawIcon(Ex) in a DC.

Ok! I can imagine that I create dumb window and print on it an icon. But now other problem arises: how to get width and height of the icon? GetIconInfo(Ex) does not return such information. I must know that info from WinApi because I want icons for files type and icons for exe and dll. Their dimensions can be various so I must get it some how...

[szyk...@gmail.com]

Ok! Now I found solution of my problem. I dig Qt sources (and after load them to memory I balanced on the edge of insufficient memory) I found in file:
Qt\5.6\Src\qtbase\src\gui\image\qpixmap_win.cpp
Function:
Q_GUI_EXPORT QPixmap qt_pixmapFromWinHICON(HICON icon)
Which is fine with me as I planed use Qt library. But without QFileIconProvider bloatware...

best regards
Szyk Cech