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annotate dep/animia/src/win/win32.cc @ 166:54c5d80a737e

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dep/animia: add libutil method I changed the "linux" method to be "proc", because it isn't exactly Linux specific this commit also has some changes to the x11 stuff: instead of enumerating over only top-level windows, we iterate over ALL of them this is because many X11 apps actually use multiple windows for some reason, I still can't get it to work with VLC, but it picks up Firefox...
author paper@DavesDouble.local
date Sun, 19 Nov 2023 04:21:56 -0500
parents cdf79282d647
children 0fc126d52de4
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1 #include "animia/win/win32.h"
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2 #include "animia.h"
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3 #include "animia/util/win32.h"
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4 #include "animia/win.h"
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5
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6 #include <set>
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7 #include <string>
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8
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9 #include <windows.h>
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10
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11 namespace animia::internal::win32 {
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12
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13 static std::wstring GetWindowClassName(HWND hwnd) {
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14 // The maximum size for lpszClassName, according to the documentation of
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15 // WNDCLASSEX structure
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16 constexpr int kMaxSize = 256;
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17
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18 std::wstring buffer(kMaxSize, L'\0');
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19 const auto size = ::GetClassNameW(hwnd, &buffer.front(), buffer.length());
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20 /* for some reason GetClassName returns the actual size of the buffer *with* the
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21 terminating NULL byte */
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22 buffer.resize(size);
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23 return buffer;
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24 }
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25
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26 static std::wstring GetWindowText(HWND hwnd) {
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27 const int estimated_size = ::GetWindowTextLengthW(hwnd);
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28
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29 std::wstring buffer(estimated_size + 1, L'\0');
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30 const auto size = ::GetWindowTextW(hwnd, &buffer.front(), buffer.length());
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31 /* GetWindowTextLength docs:
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32 "Under certain conditions, the GetWindowTextLength function may return a value
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33 that is larger than the actual length of the text." */
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34 buffer.resize(size);
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35 return buffer;
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36 }
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37
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38 static DWORD GetWindowProcessId(HWND hwnd) {
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39 DWORD process_id = 0;
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40 ::GetWindowThreadProcessId(hwnd, &process_id);
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41 return process_id;
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42 }
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43
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44 static std::wstring GetProcessPath(DWORD process_id) {
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45 // If we try to open a SYSTEM process, this function fails and the last error
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46 // code is ERROR_ACCESS_DENIED.
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47 //
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48 // Note that if we requested PROCESS_QUERY_INFORMATION access right instead
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49 // of PROCESS_QUERY_LIMITED_INFORMATION, this function would fail when used
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50 // to open an elevated process.
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51 Handle process_handle(::OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_id));
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52
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53 if (!process_handle)
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54 return std::wstring();
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55
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56 std::wstring buffer(MAX_PATH, L'\0');
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57 DWORD buf_size = buffer.length();
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58
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59 // Note that this function requires Windows Vista or above. You may use
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60 // GetProcessImageFileName or GetModuleFileNameEx on earlier versions.
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61 if (!::QueryFullProcessImageNameW(process_handle.get(), 0, &buffer.front(), &buf_size))
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62 return std::wstring();
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63
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64 buffer.resize(buf_size);
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65 return buffer;
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66 }
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67
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68 ////////////////////////////////////////////////////////////////////////////////
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69
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70 static bool VerifyWindowStyle(HWND hwnd) {
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71 const auto window_style = ::GetWindowLong(hwnd, GWL_STYLE);
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72 const auto window_ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
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73
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74 auto has_style = [&window_style](DWORD style) { return (window_style & style) != 0; };
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75 auto has_ex_style = [&window_ex_style](DWORD ex_style) { return (window_ex_style & ex_style) != 0; };
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76
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77 // Toolbars, tooltips and similar topmost windows
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78 if (has_style(WS_POPUP) && has_ex_style(WS_EX_TOOLWINDOW))
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79 return false;
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80 if (has_ex_style(WS_EX_TOPMOST) && has_ex_style(WS_EX_TOOLWINDOW))
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81 return false;
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82
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83 return true;
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84 }
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85
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86 static bool VerifyClassName(const std::wstring& name) {
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87 static const std::set<std::wstring> invalid_names = {
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88 // System classes
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89 L"#32770", // Dialog box
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90 L"CabinetWClass", // Windows Explorer
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91 L"ComboLBox",
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92 L"DDEMLEvent",
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93 L"DDEMLMom",
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94 L"DirectUIHWND",
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95 L"GDI+ Hook Window Class",
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96 L"IME",
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97 L"Internet Explorer_Hidden",
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98 L"MSCTFIME UI",
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99 L"tooltips_class32",
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100 };
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101
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102 return !name.empty() && !invalid_names.count(name);
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103 }
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104
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105 static bool VerifyProcessPath(const std::wstring& path) {
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106 return !path.empty() && !IsSystemDirectory(path);
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107 }
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108
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109 static bool VerifyProcessFileName(const std::wstring& name) {
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110 static const std::set<std::wstring> invalid_names = {
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111 // System files
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112 L"explorer", // Windows Explorer
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113 L"taskeng", // Task Scheduler Engine
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114 L"taskhost", // Host Process for Windows Tasks
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115 L"taskhostex", // Host Process for Windows Tasks
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116 L"Taskmgr", // Task Manager
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117 };
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118
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119 return !name.empty() && !invalid_names.count(name);
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120 }
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121
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122 ////////////////////////////////////////////////////////////////////////////////
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123
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124 static BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM param) {
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125 if (!::IsWindowVisible(hwnd))
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126 return TRUE;
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127
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128 if (!VerifyWindowStyle(hwnd))
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129 return TRUE;
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130
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131 Window window;
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132 window.id = static_cast<unsigned int>(reinterpret_cast<ULONG_PTR>(hwnd));
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133 window.text = ToUtf8String(GetWindowText(hwnd));
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134
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135 {
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136 std::wstring class_name = GetWindowClassName(hwnd);
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137 window.class_name = ToUtf8String(class_name);
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138 if (!VerifyClassName(class_name))
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139 return TRUE;
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140 }
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141
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142 Process process;
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143 process.pid = GetWindowProcessId(hwnd);
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144
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145 const auto path = GetProcessPath(process.pid);
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146 if (!VerifyProcessPath(path))
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147 return TRUE;
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148
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149 {
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150 std::wstring name = GetFileNameWithoutExtension(GetFileNameFromPath(path));
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151 process.name = ToUtf8String(name);
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152 if (!VerifyProcessFileName(name))
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153 return TRUE;
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154 }
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155
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156 auto& window_proc = *reinterpret_cast<window_proc_t*>(param);
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157 if (!window_proc(process, window))
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158 return FALSE;
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159
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160 return TRUE;
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161 }
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162
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163 bool Win32WinTools::EnumerateWindows(window_proc_t window_proc) {
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164 if (!window_proc)
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165 return false;
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166
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167 const auto param = reinterpret_cast<LPARAM>(&window_proc);
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168
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169 // Note that EnumWindows enumerates only top-level windows of desktop apps
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170 // (as opposed to UWP apps) on Windows 8 and above.
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171 return ::EnumWindows(EnumWindowsProc, param) != FALSE;
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172 }
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173
156
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174 } // namespace animia::internal::win32