关于 VirtualAlloc 与 SendMessage 在外部窗口ListView 控件的应用的问题，附代码
代码如下 ：
#include<windows.h>
#include<commctrl.h>
#include<iostream.h>
HWND MyFindWindow()
{
const int MyMaxParentWinCount = 3;0
char *A_szClassName[MyMaxParentWinCount] =
{
"CabinetWClass",
"SHELLDLL_DefView",
"SysListView32"
};
char *A_szWinName[MyMaxParentWinCount] =
{
"我的电脑",
"",
"FolderView"
};
HWND hLastWin = FindWindow(A_szClassName[0], A_szWinName[0]);
for(int i=1; i<MyMaxParentWinCount; i++)
{
hLastWin = FindWindowEx(hLastWin, NULL,
A_szClassName[i], A_szWinName[i]);
}
return hLastWin;
}
// 举例: HWND hLastWin = MyFindWindow();

int Main()
{
HWND hwnd;
int iItem=0;
LVITEM lvitem, *plvitem;
char ItemBuf[512],*pItem;
DWORD PID;
HANDLE hProcess;
RECT rc1,*Prc1;
char ItemBuf1[4],ItemBuf2[4],ItemBuf3[4],ItemBuf[4];

/*
hwnd=FindWindow("#32770","Windows 任务管理器");
hwnd=FindWindowEx(hwnd,0,"#32770",0);
hwnd=FindWindowEx(hwnd,0,"SysListView32",0);
*/
hwnd = MyFindWindow();
if (!hwnd)
{
MessageBox(NULL,"[Windows 任务管理器] 尚未启动！","错误！",NULL);
}
Else
{

//itoa(iItem,temp,10);
//MessageBox(NULL,temp,"iItem",NULL);
GetWindowThreadProcessId(hwnd, &PID);
hProcess=OpenProcess(PROCESS_ALL_ACCESS,false,PID);

if (!hProcess)
{
MessageBox(NULL,"获取进程句柄操作失败！","错误！",NULL);
}
Else
{
Prc1 = (RECT*)VirtualAllocEx(hProcess, NULL, sizeof(RECT), MEM_COMMIT, PAGE_READWRITE);

//plvitem=(LVITEM*)VirtualAllocEx(hProcess, NULL, sizeof(LVITEM), MEM_COMMIT, PAGE_READWRITE);
//pItem=(char*)VirtualAllocEx(hProcess, NULL, 512, MEM_COMMIT, PAGE_READWRITE);
if ((!Prc1))
{
MessageBox(NULL,"无法分配内存！","错误！",NULL);
}
Else
{
/*
lvitem.cchTextMax=512;
lvitem.iSubItem=0; //ProcessName
lvitem.pszText=pItem;
*/

WriteProcessMemory(hProcess, Prc1, &rc1, sizeof(RECT), NULL);
LRESULT lr1 = SendMessage(hwnd, LVM_GETITEMRECT, &0, (LPARAM)Prc1);
cout<<"是否成功:"<<lr1<<endl;//这里返回1代表成功

ReadProcessMemory(hProcess, Prc1, ItemBuf1, sizeof(long), NULL);
cout<<ItemBuf1<<endl;
ReadProcessMemory(hProcess, Prc1 + sizeof(long) * 1 , ItemBuf2, sizeof(long), NULL);
cout<<ItemBuf2<<endl;
ReadProcessMemory(hProcess, Prc1 + sizeof(long) * 2 , ItemBuf3, sizeof(long),
NULL);
cout<<ItemBuf3<<endl
ReadProcessMemory(hProcess, Prc1 + sizeof(long) * 3 , ItemBuf4, sizeof(long), NULL);
cout<<ItemBuf4<<endl;

cout<<"Top:"<<rc1.Top<<endl;

cout<<"Bottom:"<<rc1.Bottom<<endl;
cout<<"Left:"<<rc1.Left<<endl;
cout<<"Right:"<<rc1.Right<<endl;
cout<<"高为:"<<rc1.Bottom - rc1.Top<<endl;
cout<<"宽为:"<<rc1.Right - rc1.Right<<endl;
}
}

}
//释放内存
VirtualFreeEx(hProcess, plvitem, 0, MEM_RELEASE);
VirtualFreeEx(hProcess, pItem, 0, MEM_RELEASE);
CloseHandle(hwnd);
CloseHandle(hProcess);
return 0;
}

//以下这段代是为了获取我的电脑窗体中，ListView 的第一个元素的 RECT 结构体
//目标是为了从元素的高与宽 得知窗体的查看方式(缩略图，平铺，图标，列表，详细信息）
//这段代码是在记事本里面写的，可能会有错误，但是流程大概是这样，现在我遇到的问题是，SendMessage成功，
//但是返回的RECT结构体 读不到值，或者不知道怎么把值读出来， 请各位帮助一下
//或者大家有什么其他的方法得到我的电脑的查看方式，也可以贴出来

[解决办法]
你这么做其实是想从explorer。exe的内存空间获取数据。你用PROCESS_ALL_ACCESS这个参数OpenProcess是成功的。
我觉得你这种方法获取查看方式是错误的，看看注册表有没有相应的键值吧