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annotate dep/animia/src/win/win32.cc @ 198:bc1ae1810855

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dep/animia: switch from using classes to global functions the old idea was ok, but sort of hackish; this method doesn't use classes at all, and this way (especially important!) we can do wayland stuff AND x11 at the same time, which wasn't really possible without stupid workarounds in the other method
author Paper <mrpapersonic@gmail.com>
date Sun, 24 Dec 2023 02:59:42 -0500
parents 0fc126d52de4
children
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1 /*
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2 * win/win32.cc: support for Windows
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3 *
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4 * Surprisingly, this is the one time where Microsoft actually
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5 * does it fairly OK. Everything has a pretty simple API, despite
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6 * the stupid wide string stuff.
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7 */
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8 #include "animia/win/win32.h"
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9 #include "animia.h"
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10 #include "animia/util/win32.h"
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11 #include "animia/win.h"
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12
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13 #include <set>
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14 #include <string>
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15
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16 #include <windows.h>
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17
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18 namespace animia::internal::win32 {
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19
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20 static std::wstring GetWindowClassName(HWND hwnd) {
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21 // The maximum size for lpszClassName, according to the documentation of
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22 // WNDCLASSEX structure
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23 constexpr int kMaxSize = 256;
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24
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25 std::wstring buffer(kMaxSize, L'\0');
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26 const auto size = ::GetClassNameW(hwnd, &buffer.front(), buffer.length());
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27 /* for some reason GetClassName returns the actual size of the buffer *with* the
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28 terminating NULL byte */
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29 buffer.resize(size);
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30 return buffer;
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31 }
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32
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33 static std::wstring GetWindowText(HWND hwnd) {
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34 const auto estimated_size = ::GetWindowTextLengthW(hwnd);
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35 std::wstring buffer(estimated_size + 1, L'\0');
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36
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37 const auto size = ::GetWindowTextW(hwnd, &buffer.front(), buffer.length());
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38 /* GetWindowTextLength docs:
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39 "Under certain conditions, the GetWindowTextLength function may return a value
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40 that is larger than the actual length of the text." */
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41 buffer.resize(size);
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42 return buffer;
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43 }
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44
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45 static DWORD GetWindowProcessId(HWND hwnd) {
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46 DWORD process_id = 0;
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47 ::GetWindowThreadProcessId(hwnd, &process_id);
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48 return process_id;
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49 }
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50
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51 static std::wstring GetProcessPath(DWORD process_id) {
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52 // If we try to open a SYSTEM process, this function fails and the last error
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53 // code is ERROR_ACCESS_DENIED.
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54 //
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55 // Note that if we requested PROCESS_QUERY_INFORMATION access right instead
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56 // of PROCESS_QUERY_LIMITED_INFORMATION, this function would fail when used
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57 // to open an elevated process.
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58 Handle process_handle(::OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, process_id));
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59
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60 if (!process_handle)
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61 return std::wstring();
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62
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63 std::wstring buffer(MAX_PATH, L'\0');
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64 DWORD buf_size = buffer.length();
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65
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66 // Note that this function requires Windows Vista or above. You may use
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67 // GetProcessImageFileName or GetModuleFileNameEx on earlier versions.
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68 if (!::QueryFullProcessImageNameW(process_handle.get(), 0, &buffer.front(), &buf_size))
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69 return std::wstring();
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70
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71 buffer.resize(buf_size);
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72 return buffer;
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73 }
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74
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75 ////////////////////////////////////////////////////////////////////////////////
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76
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77 static bool VerifyWindowStyle(HWND hwnd) {
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78 const auto window_style = ::GetWindowLong(hwnd, GWL_STYLE);
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79 const auto window_ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
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80
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81 auto has_style = [&window_style](DWORD style) { return (window_style & style) != 0; };
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82 auto has_ex_style = [&window_ex_style](DWORD ex_style) { return (window_ex_style & ex_style) != 0; };
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83
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84 // Toolbars, tooltips and similar topmost windows
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85 if (has_style(WS_POPUP) && has_ex_style(WS_EX_TOOLWINDOW))
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86 return false;
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87 if (has_ex_style(WS_EX_TOPMOST) && has_ex_style(WS_EX_TOOLWINDOW))
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88 return false;
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89
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90 return true;
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91 }
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92
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93 static bool VerifyClassName(const std::wstring& name) {
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94 static const std::set<std::wstring> invalid_names = {
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95 // System classes
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96 L"#32770", // Dialog box
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97 L"CabinetWClass", // Windows Explorer
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98 L"ComboLBox",
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99 L"DDEMLEvent",
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100 L"DDEMLMom",
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101 L"DirectUIHWND",
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102 L"GDI+ Hook Window Class",
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103 L"IME",
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104 L"Internet Explorer_Hidden",
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105 L"MSCTFIME UI",
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106 L"tooltips_class32",
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107 };
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108
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109 return !name.empty() && !invalid_names.count(name);
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110 }
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111
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112 static bool VerifyProcessPath(const std::wstring& path) {
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113 return !path.empty() && !IsSystemDirectory(path);
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114 }
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115
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116 static bool VerifyProcessFileName(const std::wstring& name) {
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117 static const std::set<std::wstring> invalid_names = {
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118 // System files
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119 L"explorer", // Windows Explorer
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120 L"taskeng", // Task Scheduler Engine
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121 L"taskhost", // Host Process for Windows Tasks
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122 L"taskhostex", // Host Process for Windows Tasks
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123 L"Taskmgr", // Task Manager
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124 };
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125
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126 return !name.empty() && !invalid_names.count(name);
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127 }
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128
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129 ////////////////////////////////////////////////////////////////////////////////
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130
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131 static BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM param) {
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132 if (!::IsWindowVisible(hwnd))
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133 return TRUE;
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134
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135 if (!VerifyWindowStyle(hwnd))
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136 return TRUE;
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137
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138 Window window;
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139 window.id = static_cast<unsigned int>(reinterpret_cast<ULONG_PTR>(hwnd));
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140 window.text = ToUtf8String(GetWindowText(hwnd));
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141
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142 {
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143 std::wstring class_name = GetWindowClassName(hwnd);
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144 window.class_name = ToUtf8String(class_name);
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145 if (!VerifyClassName(class_name))
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146 return TRUE;
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147 }
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148
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149 Process process;
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150 process.pid = GetWindowProcessId(hwnd);
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151
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152 const auto path = GetProcessPath(process.pid);
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153 if (!VerifyProcessPath(path))
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154 return TRUE;
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155
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156 {
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157 std::wstring name = GetFileNameWithoutExtension(GetFileNameFromPath(path));
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158 process.name = ToUtf8String(name);
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159 if (!VerifyProcessFileName(name))
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160 return TRUE;
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161 }
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162
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163 auto& window_proc = *reinterpret_cast<window_proc_t*>(param);
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164 if (!window_proc(process, window))
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165 return FALSE;
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166
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167 return TRUE;
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168 }
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169
198
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170 bool EnumerateWindows(window_proc_t window_proc) {
152
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171 if (!window_proc)
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172 return false;
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173
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174 const auto param = reinterpret_cast<LPARAM>(&window_proc);
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175
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176 // Note that EnumWindows enumerates only top-level windows of desktop apps
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177 // (as opposed to UWP apps) on Windows 8 and above.
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178 return ::EnumWindows(EnumWindowsProc, param) != FALSE;
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179 }
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180
198
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181 } // namespace animia::internal::win32