我正在制作winform应用程序，需要从其他具有多个选项卡的Windows应用程序获取listview的内容，每个选项卡都包含一个列表视图，如Windows任务管理器。
我正在关注此Q＆amp; A Get ListView items from other windows和本指南Crossing the process boundry with .NET。 不幸的是，我真的是win32api的新手。我总是从本地缓冲区返回空字符串。
到目前为止，我的代码如下。
public partial class Form1 : Form
{
private const int LVM_FIRST = 0x1000;
private const int LVM_GETITEMCOUNT = LVM_FIRST + 4;
private const int LVM_GETITEM = LVM_FIRST + 75;
private const int LVIF_TEXT = 0x0001;
private const int LVM_SETITEM = 0x1006;
private const uint PROCESS_ALL_ACCESS = (uint)(0x000F0000L | 0x00100000L | 0xFFF);
private const uint MEM_COMMIT = 0x1000;
private const uint MEM_RELEASE = 0x8000;
private const uint PAGE_READWRITE = 0x04;
public Form1()
{
InitializeComponent();
}
[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);
[DllImport("user32.dll")]
static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, IntPtr lParam);
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32")]
static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out int lpwdProcessID);
[DllImport("kernel32")]
static extern IntPtr OpenProcess(uint dwDesiredAccess, bool bInheritHandle, int dwProcessId);
[DllImport("kernel32")]
static extern IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress, int dwSize, uint flAllocationType, uint flProtect);
[DllImport("kernel32")]
static extern bool VirtualFreeEx(IntPtr hProcess, IntPtr lpAddress, int dwSize, uint dwFreeType);
[DllImport("kernel32")]
static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, ref LV_ITEM buffer, int dwSize, IntPtr lpNumberOfBytesWritten);
[DllImport("kernel32")]
static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, IntPtr lpBuffer, int dwSize, IntPtr lpNumberOfBytesRead);
[DllImport("kernel32")]
static extern bool CloseHandle(IntPtr hObject);
[StructLayout(LayoutKind.Sequential)]
public struct LV_ITEM
{
public uint mask;
public int iItem;
public int iSubItem;
public uint state;
public uint stateMask;
public IntPtr pszText;
public int cchTextMax;
public int iImage;
}
public static string ReadListViewItem(IntPtr hWnd, int item)
{
const int dwBufferSize = 1024;
int dwProcessID;
LV_ITEM lvItem;
string retval;
bool bSuccess;
IntPtr hProcess = IntPtr.Zero;
IntPtr lpRemoteBuffer = IntPtr.Zero;
IntPtr lpLocalBuffer = IntPtr.Zero;
IntPtr threadId = IntPtr.Zero;
try
{
lvItem = new LV_ITEM();
lpLocalBuffer = Marshal.AllocHGlobal(dwBufferSize);
// Get the process id owning the window
threadId = GetWindowThreadProcessId(hWnd, out dwProcessID);
if ((threadId == IntPtr.Zero) || (dwProcessID == 0))
throw new ArgumentException("Invalid hWnd");
// Open the process with all access
hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, dwProcessID);
if (hProcess == IntPtr.Zero)
throw new ApplicationException("Failed to access process");
// Allocate a buffer in the remote process
lpRemoteBuffer = VirtualAllocEx(hProcess, IntPtr.Zero, dwBufferSize, MEM_COMMIT, PAGE_READWRITE);
if (lpRemoteBuffer == IntPtr.Zero)
throw new SystemException("Failed to allocate memory in remote process");
// Fill in the LVITEM struct, this is in your own process
// Set the pszText member to somewhere in the remote buffer,
// For the example I used the address imediately following the LVITEM stuct
lvItem.mask = LVIF_TEXT;
lvItem.iItem = item;
lvItem.pszText = (IntPtr)(lpRemoteBuffer.ToInt32() + Marshal.SizeOf(typeof(LV_ITEM)));
lvItem.cchTextMax = 50;
// Copy the local LVITEM to the remote buffer
bSuccess = WriteProcessMemory(hProcess, lpRemoteBuffer, ref lvItem, Marshal.SizeOf(typeof(LV_ITEM)), IntPtr.Zero);
if (!bSuccess)
throw new SystemException("Failed to write to process memory");
// Send the message to the remote window with the address of the remote buffer
SendMessage(hWnd, LVM_GETITEM, 0, lpRemoteBuffer);
// Read the struct back from the remote process into local buffer
bSuccess = ReadProcessMemory(hProcess, lpRemoteBuffer, lpLocalBuffer, dwBufferSize, IntPtr.Zero);
if (!bSuccess)
throw new SystemException("Failed to read from process memory");
// At this point the lpLocalBuffer contains the returned LV_ITEM structure
// the next line extracts the text from the buffer into a managed string
retval = Marshal.PtrToStringAuto((IntPtr (lpLocalBuffer.ToInt32() + Marshal.SizeOf(typeof(LV_ITEM))));
}
finally
{
if (lpLocalBuffer != IntPtr.Zero)
Marshal.FreeHGlobal(lpLocalBuffer);
if (lpRemoteBuffer != IntPtr.Zero)
VirtualFreeEx(hProcess, lpRemoteBuffer, 0, MEM_RELEASE);
if (hProcess != IntPtr.Zero)
CloseHandle(hProcess);
}
return retval;
}
private void button1_Click(object sender, EventArgs e)
{
var mainWnd = FindWindow(null, "Windows Task Manager");
var childWnd = FindWindowEx(mainWnd, IntPtr.Zero, null, "Processes");
IntPtr count = SendMessage(mainWnd, LVM_GETITEMCOUNT, IntPtr.Zero, IntPtr.Zero);
Console.WriteLine(count);
Console.WriteLine(ReadListViewItem(mainWnd, 1));
}
}
拜托，有人给我建议!!
非常感谢！