DWORD CIconExtractor::ExtractIcon(HINSTANCE hResource, LPCTSTR id, LPCTSTR TargetICON)
{
// Find the group icon resource
HRSRC hRsrc = FindResource(hResource, id, RT_GROUP_ICON);
if (!hRsrc)
return GetLastError();
HGLOBAL hGlobal = nullptr;
if ((hGlobal = LoadResource(hResource, hRsrc)) == nullptr)
return GetLastError();
LPMEMICONDIR lpIcon = nullptr;
if ((lpIcon = static_cast<LPMEMICONDIR>(LockResource(hGlobal))) == nullptr)
return GetLastError();
LPICONRESOURCE lpIR = nullptr;
if ((lpIR = static_cast<LPICONRESOURCE>(malloc(sizeof(ICONRESOURCE) + ((lpIcon->idCount - 1) * sizeof(ICONIMAGE))))) == nullptr)
return GetLastError();
SecureZeroMemory(lpIR, sizeof(ICONRESOURCE) + ((lpIcon->idCount - 1) * sizeof(ICONIMAGE)));
lpIR->nNumImages = lpIcon->idCount;
SCOPE_EXIT
{
for (UINT i = 0; i < lpIR->nNumImages; ++i)
free(lpIR->IconImages[i].lpBits);
free(lpIR);
};
// Go through all the icons
for (UINT i = 0; i < lpIR->nNumImages; ++i)
{
// Get the individual icon
if ((hRsrc = FindResource(hResource, MAKEINTRESOURCE(lpIcon->idEntries[i].nID), RT_ICON)) == nullptr)
return GetLastError();
if ((hGlobal = LoadResource(hResource, hRsrc)) == nullptr)
return GetLastError();
// Store a copy of the resource locally
lpIR->IconImages[i].dwNumBytes = SizeofResource(hResource, hRsrc);
lpIR->IconImages[i].lpBits = static_cast<LPBYTE>(malloc(lpIR->IconImages[i].dwNumBytes));
if (!lpIR->IconImages[i].lpBits)
return GetLastError();
memcpy(lpIR->IconImages[i].lpBits, LockResource(hGlobal), lpIR->IconImages[i].dwNumBytes);
// Adjust internal pointers
if (!AdjustIconImagePointers(&(lpIR->IconImages[i])))
return GetLastError();
}
return WriteIconToICOFile(lpIR, TargetICON);
}
DWORD CIconExtractor::ExtractIcon(HINSTANCE hResource, LPCTSTR id, LPCTSTR TargetICON)
{
LPICONRESOURCE lpIR = NULL;
HRSRC hRsrc = NULL;
HGLOBAL hGlobal = NULL;
LPMEMICONDIR lpIcon = NULL;
// Find the group icon resource
hRsrc = FindResource(hResource, id, RT_GROUP_ICON);
if (hRsrc == NULL)
return GetLastError();
if ((hGlobal = LoadResource(hResource, hRsrc)) == NULL)
return GetLastError();
if ((lpIcon = (LPMEMICONDIR)LockResource(hGlobal)) == NULL)
return GetLastError();
if ((lpIR = (LPICONRESOURCE) malloc(sizeof(ICONRESOURCE) + ((lpIcon->idCount-1) * sizeof(ICONIMAGE)))) == NULL)
return GetLastError();
lpIR->nNumImages = lpIcon->idCount;
// Go through all the icons
for (UINT i = 0; i < lpIR->nNumImages; ++i)
{
// Get the individual icon
if ((hRsrc = FindResource(hResource, MAKEINTRESOURCE(lpIcon->idEntries[i].nID), RT_ICON )) == NULL)
{
free(lpIR);
return GetLastError();
}
if ((hGlobal = LoadResource(hResource, hRsrc )) == NULL)
{
free(lpIR);
return GetLastError();
}
// Store a copy of the resource locally
lpIR->IconImages[i].dwNumBytes = SizeofResource(hResource, hRsrc);
lpIR->IconImages[i].lpBits =(LPBYTE) malloc(lpIR->IconImages[i].dwNumBytes);
if (lpIR->IconImages[i].lpBits == NULL)
{
free(lpIR);
return GetLastError();
}
memcpy(lpIR->IconImages[i].lpBits, LockResource(hGlobal), lpIR->IconImages[i].dwNumBytes);
// Adjust internal pointers
if (!AdjustIconImagePointers(&(lpIR->IconImages[i])))
{
free(lpIR);
return GetLastError();
}
}
DWORD ret = WriteIconToICOFile(lpIR,TargetICON);
if (ret)
{
free(lpIR);
return ret;
}
free(lpIR);
return NO_ERROR;
}
