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 #include 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;

};