Extract all icons of a file - c++

Question

First of all, I want to access all icons (16x16...256x256 and larger) in a ".exe" file.
As a result of my research, I found such code:
#ifndef __ICON_LIST_H__
#define __ICON_LIST_H__
#include <windows.h>
#include <vector>
class IconFile: public std::vector<HICON>{
public:
IconFile(){};
IconFile(std::string i_filename){
addIconsFromFile(i_filename);
};
int addIconsFromFile(std::string i_fileName){
int iCount=0;
HANDLE file = CreateFile( i_fileName.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, 0, NULL);
if(file!=INVALID_HANDLE_VALUE){
int size = GetFileSize(file,NULL);
DWORD actRead;
BYTE* buffer = new BYTE[size];
ReadFile(file, buffer, size, &actRead, NULL);
CloseHandle(file);
int ind = -1;
for(int p = 0; p< size-4; ++p){
if(buffer[p]==40 && buffer[p+1]==0 && buffer[p+2]==0 && buffer[p+3]==0){
HICON icon = CreateIconFromResourceEx(&buffer[p], size-p, true, 0x00030000,0,0,0);
if(icon){
++iCount;
this->push_back(icon);
}
}
}
delete[] buffer;
}
return iCount;
};
};
#endif //__ICON_LIST_H__
This code works fine but doesn't show 256x256 or larger icon, Code output:
std::vector(0x8ef2013, 0x64ce1867, 0x24681219)
Currently, this is the icon list of the file:
How can I get the 256x256 icon?

Answer 1

Use LoadLibraryEx to load the file, EnumResourceNames to enumerate icons, and CreateIconFromResourceEx to lead each icon.
Note that driving a class from std::vector and other C++ Standard Library containers is not recommended.
The example below uses LR_SHARED, you might want to change that.
#include <windows.h>
#include <vector>
BOOL CALLBACK EnumIcons(HMODULE hmodule, LPCTSTR type, LPTSTR lpszName,
LONG_PTR ptr)
{
if (!ptr)
return FALSE;
auto pvec = (std::vector<HICON>*)ptr;
auto hRes = FindResource(hmodule, lpszName, type);
if (!hRes)
return TRUE;
auto size = SizeofResource(hmodule, hRes);
auto hg = LoadResource(hmodule, hRes);
if (!hg)
return TRUE;
auto bytes = (BYTE*)LockResource(hg);
auto hicon = CreateIconFromResourceEx(bytes, size, TRUE, 0x00030000,
0, 0, LR_SHARED);
if (hicon)
pvec->push_back(hicon);
return TRUE;
}
int main()
{
std::vector<HICON> vec;
const char* modulepath = "file.exe";
HMODULE hmodule = LoadLibraryEx(modulepath, NULL,
LOAD_LIBRARY_AS_IMAGE_RESOURCE);
if (!hmodule)
return 0;
EnumResourceNames(hmodule, RT_ICON,(ENUMRESNAMEPROC)EnumIcons,(LONG_PTR)&vec);
for (auto e : vec)
{
ICONINFOEX ii = { sizeof(ii) };
if (!GetIconInfoEx(e, &ii) || !ii.hbmColor)
continue;
BITMAP bm;
GetObject(ii.hbmColor, sizeof(bm), &bm);
printf("%d %d %d\n", bm.bmWidth, bm.bmHeight, bm.bmBitsPixel);
}
//free icons...
return 0;
}