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分享SHChangeNotifyRegister 监测文件改变
我使用这个函数去监测文件和文件夹改变的时候 遇到个问题
在监测文件和文件夹重命名的时候，收到了两次文件和文件夹重命名的消息，不知道为什么会产生两次消息。
谁能给我讲讲是我代码的问题，还是本来就会收到两次消息，为什么会有这两次呢？我觉得应该有什么原因的。
我电脑是XP系统的。还有我担心其他的操作系统可能会不是这样的哈，如WIN7 VISTA这些
测试代码如下:
在监测文件和文件夹重命名的时候，收到了两次文件和文件夹重命名的消息，不知道为什么会产生两次消息。
谁能给我讲讲是我代码的问题，还是本来就会收到两次消息，为什么会有这两次呢？我觉得应该有什么原因的。
我电脑是XP系统的。还有我担心其他的操作系统可能会不是这样的哈，如WIN7 VISTA这些
测试代码如下:
#include "stdafx.h"
#include "MonitorChanged.h"
#include <InitGuid.h>
#include <ShlObj.h>
#include <ShellAPI.h>
#define MAX_LOADSTRING 100
#define WM_MONITOR WM_USER+123
#define SHCNRF_ShellLevel 0x0002
// 全局变量:
HINSTANCE hInst; // 当前实例
TCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名
DWORD dwNotifyID=0;
typedef struct{
DWORD dwItem1;
DWORD dwItem2;
}SHNOTIFYSTRUCT;
// 此代码模块中包含的函数的前向声明:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: 在此放置代码。
MSG msg;
HACCEL hAccelTable;
// 初始化全局字符串
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_MONITORCHANGED, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// 执行应用程序初始化:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MONITORCHANGED));
// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
SHChangeNotifyDeregister(dwNotifyID);
return (int) msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MONITORCHANGED));
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCE(IDC_MONITORCHANGED);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassEx(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
hInst = hInstance; // 将实例句柄存储在全局变量中
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
if (!hWnd)
{
return FALSE;
}
IShellFolder *m_lpsfDesktop;
SHGetDesktopFolder(&m_lpsfDesktop);
LPITEMIDLIST pidl;
m_lpsfDesktop->ParseDisplayName(NULL, NULL, _T("H:\\"), NULL, &pidl, NULL);
SHChangeNotifyEntry shcne;
shcne.pidl=pidl;
shcne.fRecursive=TRUE;
dwNotifyID=::SHChangeNotifyRegister(hWnd,SHCNRF_ShellLevel, SHCNE_RENAMEITEM|SHCNE_CREATE|SHCNE_DELETE|SHCNE_MKDIR|SHCNE_RMDIR|SHCNE_RENAMEFOLDER, WM_MONITOR,1,&shcne);
m_lpsfDesktop->Release();
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: 在此添加任意绘图代码...
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_MONITOR:
{
TCHAR ch[MAX_PATH]={0};
TCHAR ch2[MAX_PATH]={0};
switch(lParam)
{
case SHCNE_RENAMEITEM: //收到两次消息
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem2),ch2);
OutputDebugStringW(_T("RENAME FILE:\nOLD PATH - "));
OutputDebugStringW(ch);
OutputDebugStringW(_T("\nNEW PATH - "));
OutputDebugStringW(ch2);
OutputDebugStringW(_T("\n"));
break;
case SHCNE_CREATE:
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
OutputDebugStringW(_T("CREATE FILE:\nPATH - "));
OutputDebugStringW(ch);
break;
case SHCNE_DELETE:
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
OutputDebugStringW(_T("DELETE FILE:\nPATH - "));
OutputDebugStringW(ch);
break;
case SHCNE_MKDIR:
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
OutputDebugStringW(_T("CREATE FOLDER:\nPATH - "));
OutputDebugStringW(ch);
break;
case SHCNE_RMDIR:
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
OutputDebugStringW(_T("DELETE FOLDER:\nPATH - "));
OutputDebugStringW(ch);
break;
case SHCNE_RENAMEFOLDER: //收到两次消息
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem1),ch);
::SHGetPathFromIDList((LPCITEMIDLIST)LongToPtr(((SHNOTIFYSTRUCT*)wParam)->dwItem2),ch2);
OutputDebugStringW(_T("RENAME FOLDER:\nOLD PATH - "));
OutputDebugStringW(ch);
OutputDebugStringW(_T("\nNEW PATH - "));
OutputDebugStringW(ch2);
OutputDebugStringW(_T("\n"));
break;
}
}
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
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