【发布时间】：2016-04-14 16:30:21
【问题描述】：
我花了几个小时浏览微软的开发中心；但是，我似乎无法弄清楚如何做以下两件事：
在“导航器”子窗口的“专家顾问”部分下循环并查看每个程序的名称（例如下面屏幕截图中的“MACD 示例”）
选择并双击程序（例如“MACD 样本”）。
Winspector(Left) | Application(Right)
我的主要问题似乎是我不知道如何正确使用 HTREEITEM 来访问信息。我注意到有一个函数 ListView_GetItemText，但我一直找不到 TreeView_GetItemText 或等效函数。
任何帮助将不胜感激。
下面是我的程序的主要功能：
int _tmain(int argc, _TCHAR* argv[])
{
wcout << TEXT("Enumerating Windows...") << endl;
HWND handle = NULL;
//--- Success: gets application handle
bool success1 = getHandle(L"MetaTrader", L"20", handle);
cout << "Success1: " << success1 << endl;
cout << "Result1: " << handle << endl;
//--- Success: gets navigator window
bool success2 = getChildHandle(handle, L"", L"Navigator", handle);
cout << "Success2: " << success2 << endl;
cout << "Result2: " << handle << endl;
//--- Success: gets "SysTreeView32" handle
handle = FindWindowEx(handle, 0, L"SysTreeView32", L"");
cout << "Result3: " << handle << endl;
//--- Success: get "SysTreeView32" root nod
HTREEITEM root = TreeView_GetNextItem(handle, NULL, TVGN_ROOT);
cout << "root: " << root << endl;
return 0;
}
运行代码的结果似乎运行正常
完整的代码：
// MT4Terminal-test.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#pragma once
#include "targetver.h"
#include <iostream>
#include <map>
#include <string>
namespace std {
#if defined _UNICODE || defined UNICODE
typedef wstring tstring;
#else
typedef string tstring;
#endif
}
#include <stdio.h>
#include <tchar.h>
#include <Windows.h>
#include <psapi.h>
#include <Windows.h>
#include <Commctrl.h>
#include <windows.system.h>
using namespace std;
HWND glb_handle;
tstring glb_searchWindowTitle;
tstring glb_seachClassName;
BOOL CALLBACK enumWindowsChildProc(
__in HWND hWnd,
__in LPARAM lParam
) {
return TRUE;
}
BOOL CALLBACK enumWindowsProc(
__in HWND hWnd,
__in LPARAM lParam
) {
int length = ::GetWindowTextLength(hWnd);
if (0 == length) return TRUE;
TCHAR* bufferA;
bufferA = new TCHAR[length + 1];
memset(bufferA, 0, (length + 1) * sizeof(TCHAR));
TCHAR* bufferB;
bufferB = new TCHAR[100];
memset(bufferB, 0, 100 * sizeof(TCHAR));
GetWindowText(hWnd, bufferA, length + 1);
GetClassName(hWnd, bufferB, 100);
tstring windowTitle = tstring(bufferA);
tstring className = tstring(bufferB);
delete bufferA;
delete bufferB;
if (windowTitle.find(glb_searchWindowTitle) < string::npos &&
className.find(glb_seachClassName) < string::npos)
glb_handle = hWnd;
wcout.clear();
return TRUE;
}
bool getHandle(wstring searchClassName, wstring searchWindowTitle, HWND &handle)
{
handle = NULL;
glb_handle = NULL;
glb_searchWindowTitle = searchWindowTitle;
glb_seachClassName = searchClassName;
BOOL enumeratingWindowsSucceeded = EnumWindows(enumWindowsProc, NULL);
if (enumeratingWindowsSucceeded)
{
if (glb_handle != NULL)
{
handle = glb_handle;
return true;
}
}
glb_handle = NULL;
glb_searchWindowTitle = L"";
glb_seachClassName = L"";
return false;
}
bool getChildHandle(HWND parent_handle, wstring searchClassName, wstring searchWindowTitle, HWND &handle)
{
handle = NULL;
glb_handle = NULL;
glb_searchWindowTitle = searchWindowTitle;
glb_seachClassName = searchClassName;
BOOL enumeratingWindowsSucceeded = EnumChildWindows(parent_handle, enumWindowsProc, NULL);
if (enumeratingWindowsSucceeded)
{
if (glb_handle != NULL)
{
handle = glb_handle;
return true;
}
}
glb_handle = NULL;
glb_searchWindowTitle = L"";
glb_seachClassName = L"";
return false;
}
int _tmain(int argc, _TCHAR* argv[])
{
wcout << TEXT("Enumerating Windows...") << endl;
HWND handle = NULL;
//--- Success: gets application handle
bool success1 = getHandle(L"MetaTrader", L"20", handle);
cout << "Success1: " << success1 << endl;
cout << "Result1: " << handle << endl;
//--- Success: gets navigator window
bool success2 = getChildHandle(handle, L"", L"Navigator", handle);
cout << "Success2: " << success2 << endl;
cout << "Result2: " << handle << endl;
//--- Success: gets "SysTreeView32" handle
handle = FindWindowEx(handle, 0, L"SysTreeView32", L"");
cout << "Result3: " << handle << endl;
//--- Success: get "SysTreeView32" root nod
HTREEITEM root = TreeView_GetNextItem(handle, NULL, TVGN_ROOT);
cout << "root: " << root << endl;
return 0;
}
选择 SysTreeView32 项目
（为澄清起见，当我说选择 SysTreeView32 项目时，我指的是模拟树节点上的双击操作——类似于双击桌面上的图标打开程序的方式）
看完文档，我深信不疑：
不存在显式消息，该消息将使用树视图项的句柄模拟双击树上的节点
一种可能的解决方法是发送 TVM_GETITEMRECT 消息以获取树节点的坐标，然后使用 SendInput() 发送点击
以上两种说法正确吗？
在实现 Barmak Shemirani 的代码后，我尝试使用与 Barmak Shemirani 的修复相同的方法来实现上面的 #2。具体来说，我尝试使用 VirtualAllocEx() 在其他应用程序的内存中分配一个 Rect 结构，使用指向该矩形的指针在我的程序中调用 TreeView_GetItemRect 宏，然后使用 ReadProcessMemory() 读取结果。
但是，当我调用 TreeView_GetItemRect()，同时将指针传递给其他应用程序内存中的 Rect 时，我的程序崩溃了。很可能是因为 TreeView_GetItemRect() 试图将 Rect 坐标写入无效的内存地址。这让我意识到我并不真正理解宏在做什么：
-
因此，查看源代码，我发现：
#define HELLO #define TV_FIRST 0x1100 // TreeView messages #define TVM_GETITEMRECT (TV_FIRST + 4) #define TreeView_GetItemRect(hwnd, hitem, prc, code) \ (*(HTREEITEM *)(prc) = (hitem), (BOOL)SNDMSG((hwnd), TVM_GETITEMRECT, (WPARAM)(code), (LPARAM)(RECT *)(prc)))
除了 SNDMSG 函数之前的部分，我基本都懂：
(*(HTREEITEM *)(prc) = (hitem),
上面的陈述究竟是什么意思？这是否将我传递给 HTREEITEM 指针的矩形指针转换为导致程序崩溃的某种方式？
Screenshot of console freezing
新代码
int _tmain(int argc, _TCHAR* argv[])
{
wcout << TEXT("Enumerating Windows...") << endl;
HWND handle = NULL;
//--- Success: gets application handle
bool success1 = getHandle(L"MetaTrader", L"20", handle);
//--- Success: gets navigator window
bool success2 = getChildHandle(handle, L"", L"Navigator", handle);
//--- Success: gets "SysTreeView32" handle
handle = FindWindowEx(handle, 0, L"SysTreeView32", L"");
//--- Success: get "SysTreeView32" root nod
HTREEITEM root = TreeView_GetNextItem(handle, NULL, TVGN_ROOT);
unsigned long pid;
GetWindowThreadProcessId(handle, &pid);
HANDLE process = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_READ | PROCESS_VM_WRITE |
PROCESS_QUERY_INFORMATION, FALSE, pid);
TVITEM item, *_item;
wchar_t buf[CHAR_BUF_LEN];
wchar_t *_buf;
memset(buf, 0, sizeof(buf) / sizeof(buf[0]));
_item = (TVITEM*)VirtualAllocEx(process, NULL, sizeof(TVITEM), MEM_COMMIT, PAGE_READWRITE);
_buf = (wchar_t*)VirtualAllocEx(process, NULL, CHAR_BUF_LEN, MEM_COMMIT, PAGE_READWRITE);
item.cchTextMax = CHAR_BUF_LEN;
item.pszText = _buf;
item.mask = TVIF_TEXT;
//--- find Experts Advisors branch in tree
HTREEITEM node = TreeView_GetNextItem(handle, root, TVGN_CHILD);
node = TreeView_GetNextItem(handle, node, TVGN_NEXT);
node = TreeView_GetNextItem(handle, node, TVGN_NEXT);
RECT rect, *_rect;
_rect = (RECT*)VirtualAllocEx(process, NULL, sizeof(RECT), MEM_COMMIT, PAGE_READWRITE);
rect = { 0 };
WriteProcessMemory(process, _rect, &rect, sizeof(RECT), NULL);
//--- step into Expert Advisors
node = TreeView_GetNextItem(handle, node, TVGN_CHILD);
//--- target program to open
wchar_t ea_name[] = L"MACD Sample";
while (node != NULL)
{
ZeroMemory(buf, CHAR_BUF_LEN);
item.hItem = node;
//Binds item and _item
WriteProcessMemory(process, _item, &item, sizeof(TVITEM), NULL);
TreeView_GetItem(handle, _item);
//Read buffer back to this program's process memory
ReadProcessMemory(process, _buf, buf, CHAR_BUF_LEN, NULL);
//Print program name
wcout << buf << endl;
if (wcscmp(ea_name, buf) == 0)
{
cout << "Found target program: " << ea_name << endl;
cout << "get rectangle coordinates: " << TreeView_GetItemRect(handle, node, _rect, TRUE) << endl;
}
node = TreeView_GetNextItem(handle, node, TVGN_NEXT);
}
VirtualFreeEx(process, _item, 0, MEM_RELEASE);
VirtualFreeEx(process, _buf, 0, MEM_RELEASE);
VirtualFreeEx(process, _rect, 0, MEM_RELEASE);
return 0;
}
【问题讨论】：
标签： windows user-interface visual-c++