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annotate dep/animia/src/win/win32.cc @ 221:53211cb1e7f5

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library: add initial library stuff nice
author Paper <paper@paper.us.eu.org>
date Mon, 08 Jan 2024 13:21:08 -0500
parents bc1ae1810855
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