CListCtrl and Image List - Help

[mshahbazi]

I have a ClistCtrl in a Dialog.
In the CListCtrl, I am displaying the File name and Path, etc. I need to display the System Icon for each file.

I know that I need to call

SHFILEINFO sfi;
HIMAGELIST himl = (HIMAGELIST)SHGetFileInfo(
_T("C:\\"),
0,
&sfi,
sizeof(SHFILEINFO),
SHGFI_SMALLICON | SHGFI_SYSICONINDEX
);

to get the handle to the system Icons. I should then create a Image List.

This is my question; How should I make the Image List and the How can I use it.

Any help, sample code, etc will be help ful.

Thanks

Mike

[kiru]

Hi ,
This is what we R doing in our implimentation..


Call the AddImageToList function by passing the file name (we R using .bmp files)

BOOL CFUIWallSymbols::AddImageToList(CString& str)
{
CBitmap img;
LoadBMPImage( str, img, NULL );
m_pImageList->Add(&img, (CBitmap*)NULL);//m_pImageList is the object of CImageList
return TRUE;
}

// LoadBMPImage - Loads a BMP file and creates a bitmap GDI object
// also creates logical palette for it.
// Returns - TRUE for success
// sBMPFile - Full path of the BMP file
// bitmap - The bitmap object to initialize
// pPal - Will hold the logical palette. Can be NULL

BOOL CFUIWallSymbols::LoadBMPImage(LPCTSTR sBMPFile, CBitmap &bitmap, CPalette *pPal)
{
CFile file;
if( !file.Open( sBMPFile, CFile::modeRead) )
return FALSE;

BITMAPFILEHEADER bmfHeader;

// Read file header
if (file.Read((LPSTR)&bmfHeader, sizeof(bmfHeader)) != sizeof(bmfHeader))
return FALSE;

// File type should be 'BM'
if (bmfHeader.bfType != ((WORD) ('M' << 8) | 'B'))
return FALSE;

// Get length of the remainder of the file and allocate memory
DWORD nPackedDIBLen = file.GetLength() - sizeof(BITMAPFILEHEADER);
HGLOBAL hDIB = ::GlobalAlloc(GMEM_FIXED, nPackedDIBLen);
if (hDIB == 0)
return FALSE;

// Read the remainder of the bitmap file.
if (file.ReadHuge((LPSTR)hDIB, nPackedDIBLen) != nPackedDIBLen )
{
::GlobalFree(hDIB);
return FALSE;
}


BITMAPINFOHEADER &bmiHeader = *(LPBITMAPINFOHEADER)hDIB ;
BITMAPINFO &bmInfo = *(LPBITMAPINFO)hDIB ;

// If bmiHeader.biClrUsed is zero we have to infer the number
// of colors from the number of bits used to specify it.
int nColors = bmiHeader.biClrUsed ? bmiHeader.biClrUsed :
1 << bmiHeader.biBitCount;

LPVOID lpDIBBits;
if( bmInfo.bmiHeader.biBitCount > 8 )
lpDIBBits = (LPVOID)((LPDWORD)(bmInfo.bmiColors + bmInfo.bmiHeader.biClrUsed) +
((bmInfo.bmiHeader.biCompression == BI_BITFIELDS) ? 3 : 0));
else
lpDIBBits = (LPVOID)(bmInfo.bmiColors + nColors);

// Create the logical palette
if( pPal != NULL )
{
// Create the palette
if( nColors <= 256 )
{
UINT nSize = sizeof(LOGPALETTE) + (sizeof(PALETTEENTRY) * nColors);
LOGPALETTE *pLP = (LOGPALETTE *) new BYTE[nSize];

pLP->palVersion = 0x300;
pLP->palNumEntries = nColors;

for( int i=0; i < nColors; i++)
{
pLP->palPalEntry[i].peRed = bmInfo.bmiColors[i].rgbRed;
pLP->palPalEntry[i].peGreen = bmInfo.bmiColors[i].rgbGreen;
pLP->palPalEntry[i].peBlue = bmInfo.bmiColors[i].rgbBlue;
pLP->palPalEntry[i].peFlags = 0;
}

pPal->CreatePalette( pLP );

delete[] pLP;
}
}

CClientDC dc(NULL);
CPalette* pOldPalette = NULL;
if( pPal )
{
pOldPalette = dc.SelectPalette( pPal, FALSE );
dc.RealizePalette();
}

HBITMAP hBmp = CreateDIBitmap( dc.m_hDC, // handle to device context
&bmiHeader, // pointer to bitmap size and format data
CBM_INIT, // initialization flag
lpDIBBits, // pointer to initialization data
&bmInfo, // pointer to bitmap color-format data
DIB_RGB_COLORS); // color-data usage
bitmap.Attach( hBmp );

if( pOldPalette )
dc.SelectPalette( pOldPalette, FALSE );

::GlobalFree(hDIB);
return TRUE;

}

I think this will solve U R problem

[Nepo12]

I did this and it compiled clean but when the CreateDIBitmap was executed the hBmp created was NULL. Not sure why since all the fields fed to the CreateDIBitmap function are all populated.

Thanks.

[Nepo12]

I just had to recompile and the hBmp was coming back ok but when added to the CImageList and added to the listCtrl, it is coming up blank.

[Nepo12]

How can I tell if the hbitmap created is valid. It's not null yet when I try to display it, it's blank.