Thread: SizeofResource not returning right size

Im trying to lock and write the icon resource, that is in module itself, to a file.
Its an icon.ico file 16x16 with size 1150 bytes and SizeofResource returns only 20 bytes.

GetLastError returns "The operation completed successfully". and the icon is displayed as expected.

resource.rc

Code:

#define IDI_MYICON   101

IDI_MYICON   ICON  "myicon.ico"

The function:

Code:

void Resource()
{
    FILE *file;
    HRSRC hRes = NULL;
    HGLOBAL hResLoaded;
    LPVOID lpResLock = NULL;
    char* cbuf;
    DWORD sizeOfRes;
    int i;
    hRes = FindResource(NULL,
                            MAKEINTRESOURCE(IDI_MYICON),
                            RT_GROUP_ICON);
    
    if(hRes != NULL)
    {
        hResLoaded = LoadResource(NULL, hRes);

        if(hResLoaded != NULL)
        {
            sizeOfRes = SizeofResource(NULL, hRes);
            cout << "Size = "<< sizeOfRes << endl;
            cbuf = (char*) calloc (sizeOfRes, sizeof(char));
            strcpy(cbuf,(char*)LockResource(hResLoaded));

            if(sizeOfRes != 0)
            {
                file = fopen("myfile.txt", "wb");
                if(file != NULL)
                {
                    for(i = 0; i < sizeOfRes; i++)
                    {
                        fwrite(&cbuf[i],sizeof(char),1,file);
                    }
                    fclose(file);
                }
            }
        }
        free(cbuf);
        UnlockResource(hResLoaded);
        FreeResource(hResLoaded);
    }
}

I think you are getting the size of a GRPICONDIR struct (holding an array of pointers to the image data you want).

Have a read here.

Icons

Thank you very much Novocain!