用c++ 做到在桌面上悬浮某个图标时获取这个图标的位置信息

就像 windows这样，悬浮后会有一个tips出来里面是位置信息

使用shell扩展可以实现
参考：
http://www.codeproject.com/Articles/448/The-Complete-Idiots-Guide-to-Writing-Shell-Exten

至于根据快捷方式文件（.lnk）得到指向的文件和路径，参考：
http://www.codeguru.com/cpp/com-tech/shell/article.php/c1337/Getting-Shortcuts-lnk--Target-and-Arguments.htm

http://blog.csdn.net/mycaibo/article/details/6002334

我的目的是要遍历整个桌面的所有图标，获取每个图标的坐标，我在百度上搜了很多例子，也运行了，但是都不行，感觉最靠谱的就是这个

void Recurse(LPCTSTR pstr)
{

HWND hDestTop;
hDestTop = ::FindWindow("progman", NULL);
hDestTop = ::FindWindowEx(hDestTop, 0, "shelldll_defview", NULL);
hDestTop = ::FindWindowEx(hDestTop, 0, "syslistview32", NULL);

int count=(int)::SendMessage( hDestTop, LVM_GETITEMCOUNT, 0, 0);

LVITEM lvi, *_lvi;
char item[512], subitem[512];
char *_item, *_subitem;
unsigned long pid;
HANDLE process;

GetWindowThreadProcessId( hDestTop, &pid);
process=OpenProcess(PROCESS_VM_OPERATION|PROCESS_VM_READ|PROCESS_VM_WRITE|PROCESS_QUERY_INFORMATION, FALSE, pid);

_lvi=(LVITEM*)VirtualAllocEx(process, NULL, sizeof(LVITEM), MEM_COMMIT, PAGE_READWRITE);
_item=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT, PAGE_READWRITE);
_subitem=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT, PAGE_READWRITE);

RECT  rc;
rc.left = LVIR_ICON;  //这个一定要设定 可以去看MSDN关于LVM_GETITEMRECT的说明
RECT* _rc =(RECT*)VirtualAllocEx( process, NULL, sizeof(RECT), MEM_COMMIT, PAGE_READWRITE); 

lvi.cchTextMax=512;

for( int i=0; i< count; i++) {

    lvi.iSubItem=0;
    lvi.pszText=_item;
    WriteProcessMemory(process, _lvi, &lvi, sizeof(LVITEM), NULL);
    ::SendMessage( hDestTop, LVM_GETITEMTEXT, (WPARAM)i, (LPARAM)_lvi);

    lvi.iSubItem=1;
    lvi.pszText=_subitem;
    WriteProcessMemory(process, _lvi, &lvi, sizeof(LVITEM), NULL);
    ::SendMessage( hDestTop, LVM_GETITEMTEXT, (WPARAM)i, (LPARAM)_lvi);

    ::WriteProcessMemory( process, _rc, &rc, sizeof(rc), NULL);
    ::SendMessage( hDestTop, LVM_GETITEMRECT, (WPARAM)i, (LPARAM)_rc);

    ReadProcessMemory(process, _item, item, 512, NULL);
    ReadProcessMemory(process, _subitem, subitem, 512, NULL);


    ReadProcessMemory(process, _rc, &rc, sizeof(rc), NULL);
    CString str;
    str.Format("LF:%d TP:%d RT:%d BT:%d", rc.left,rc.top,rc.right,rc.bottom);
    AfxMessageBox(str);

    str.Format("%s - %s\n", item, subitem);
    AfxMessageBox( str );
}

VirtualFreeEx(process, _lvi, 0, MEM_RELEASE);
VirtualFreeEx(process, _item, 0, MEM_RELEASE);
VirtualFreeEx(process, _subitem, 0, MEM_RELEASE);
VirtualFreeEx(process, _rc, 0, MEM_RELEASE);

CloseHandle( process );

return ;

}

但是这个例子运行起来不起作用messagebox 打出来的结果是空的

跟踪查到
_lvi=(LVITEM*)VirtualAllocEx(process, NULL, sizeof(LVITEM), MEM_COMMIT, PAGE_READWRITE);
_item=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT, PAGE_READWRITE);
_subitem=(char*)VirtualAllocEx(process, NULL, 512, MEM_COMMIT, PAGE_READWRITE);

这个地方获取出来的指针都是错误的指针，虽然有值但不起作用，不知道哪里出错了