Shell_NotifyIcon实现任意托盘图标的隐藏与再现

发TB_HIDEBUTTON消息来隐藏托盘图标并不完美，会留下一块空白

仔细看一下NOTIFYICONDATA结构，发现了dwState

如果dwStateMask为NIS_HIDDEN，则当dwState为NIS_HIDDEN时图标隐藏；当dwState为NIS_SHAREDICON时图标显示

代码参考：

#define _WIN32_IE 0x0500#include <windows.h>#include <CommCtrl.h>struct TRAYDATA{  HWND hwnd;                  UINT uID;                  UINT uCallbackMessage;      DWORD Reserved[2];          HICON hIcon;                };void ShowTrayIcon(LPCWSTR lpwszIcon, BOOL bShow){  HWND hWnd,hWndPaper;  DWORD dwProcessId;  int nButtonCount;  HANDLE hProcess;  LPVOID lpAddress;  TBBUTTON tb;    hWnd = FindWindow(TEXT("Shell_TrayWnd"), NULL);  hWnd = FindWindowEx(hWnd, 0, TEXT("TrayNotifyWnd"), NULL);  hWndPaper = FindWindowEx(hWnd, 0, TEXT("SysPager"), NULL);  if(!hWndPaper)    hWnd = FindWindowEx(hWnd, 0, TEXT("ToolbarWindow32"), NULL);  else    hWnd = FindWindowEx(hWndPaper, 0, TEXT("ToolbarWindow32"), NULL);  GetWindowThreadProcessId(hWnd, &dwProcessId);  hProcess = OpenProcess(PROCESS_ALL_ACCESS    |PROCESS_VM_OPERATION    |PROCESS_VM_READ    |PROCESS_VM_WRITE,    0,    dwProcessId);  lpAddress = VirtualAllocEx(hProcess,0, 0x4096, MEM_COMMIT, PAGE_READWRITE);  nButtonCount = SendMessage(hWnd, TB_BUTTONCOUNT, 0, 0);    for(int i = 0 ; i < nButtonCount - 1; i++)  {    SendMessage(hWnd, TB_GETBUTTON, i, (LPARAM)lpAddress);    ReadProcessMemory(hProcess, lpAddress, &tb, sizeof(TBBUTTON), 0);    if(tb.iString != -1)    {      TRAYDATA trayData;      WCHAR wszBuff[MAX_PATH] = {0};      WCHAR *pwsz = NULL;      ReadProcessMemory(hProcess, (LPVOID)tb.iString, wszBuff, MAX_PATH, 0);      ReadProcessMemory(hProcess, (LPVOID)tb.dwData, &trayData, sizeof(TRAYDATA), 0);      pwsz = wcsstr(wszBuff, lpwszIcon);      if (pwsz)      {        NOTIFYICONDATA nid;        nid.cbSize = sizeof(NOTIFYICONDATA);        nid.hWnd = trayData.hwnd;        nid.uID = trayData.uID;        nid.uFlags = NIF_STATE;        nid.dwState = bShow?NIS_SHAREDICON:NIS_HIDDEN;        nid.dwStateMask = NIS_HIDDEN;        Shell_NotifyIcon(NIM_MODIFY, &nid);      }    }  }  VirtualFreeEx( hProcess, lpAddress, 0, MEM_RELEASE);  CloseHandle(hProcess);}int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){  ShowTrayIcon(L"音量", FALSE);  //隐藏音量图标  //ShowTrayIcon(L"音量", TRUE);  //显示音量图标  return 0;}

以上代码稍微解释一下吧：

任务栏的通知区域是个Toolbar，发TB_GETBUTTON消息可以获取Toolbar上某个按钮的信息

因为是要跨进程缓冲区的，所以需要用到ReadProcessMemory

获取到的TBBUTTON的dwData是个结构指针的，微软没有公开，但在网上可以找到：

struct TBBUTTONDATA {     HWND hwnd; //the handle of the window on the taskbar     UINT uID;     UINT uCallbackMessage;     DWORD Reserved[2];     HICON hIcon; };