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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 "animone/win/win32.h"
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9 #include "animone.h"
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10 #include "animone/util/win32.h"
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11 #include "animone/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 animone::internal::win32 {
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19
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20 static std::wstring GetWindowClassName(HWND hwnd) {
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21 static constexpr int kMaxSize = 256;
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22
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23 std::wstring buffer(kMaxSize, L'\0');
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24 const auto size = ::GetClassNameW(hwnd, &buffer.front(), buffer.length());
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25 buffer.resize(size);
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26 return buffer;
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27 }
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28
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29 static std::wstring GetWindowText(HWND hwnd) {
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30 const auto estimated_size = ::GetWindowTextLengthW(hwnd);
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31 std::wstring buffer(estimated_size + 1, L'\0');
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32
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33 const auto size = ::GetWindowTextW(hwnd, &buffer.front(), buffer.length());
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34 /* GetWindowTextLength docs:
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35 * "Under certain conditions, the GetWindowTextLength function may return a value
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36 * that is larger than the actual length of the text." */
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37 buffer.resize(size);
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38 return buffer;
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39 }
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40
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41 static DWORD GetWindowProcessId(HWND hwnd) {
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42 DWORD process_id = 0;
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43 ::GetWindowThreadProcessId(hwnd, &process_id);
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44 return process_id;
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45 }
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46
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47 ////////////////////////////////////////////////////////////////////////////////
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48
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49 static bool VerifyWindowStyle(HWND hwnd) {
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50 const auto window_style = ::GetWindowLong(hwnd, GWL_STYLE);
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51 const auto window_ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
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52
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53 auto has_style = [&window_style](DWORD style) { return (window_style & style) != 0; };
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54 auto has_ex_style = [&window_ex_style](DWORD ex_style) { return (window_ex_style & ex_style) != 0; };
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55
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56 // Toolbars, tooltips and similar topmost windows
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57 if (has_style(WS_POPUP) && has_ex_style(WS_EX_TOOLWINDOW))
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58 return false;
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59 if (has_ex_style(WS_EX_TOPMOST) && has_ex_style(WS_EX_TOOLWINDOW))
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60 return false;
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61
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62 return true;
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63 }
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64
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65 static bool VerifyClassName(const std::wstring& name) {
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66 static const std::set<std::wstring> invalid_names = {
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67 // System classes
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68 L"#32770", // Dialog box
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69 L"CabinetWClass", // Windows Explorer
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70 L"ComboLBox",
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71 L"DDEMLEvent",
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72 L"DDEMLMom",
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73 L"DirectUIHWND",
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74 L"GDI+ Hook Window Class",
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75 L"IME",
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76 L"Internet Explorer_Hidden",
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77 L"MSCTFIME UI",
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78 L"tooltips_class32",
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79 };
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80
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81 return !name.empty() && !invalid_names.count(name);
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82 }
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83
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84 static bool VerifyProcessPath(const std::wstring& path) {
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85 return !path.empty() && !IsSystemDirectory(path);
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86 }
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87
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88 static bool VerifyProcessFileName(const std::wstring& name) {
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89 static const std::set<std::wstring> invalid_names = {
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90 // System files
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91 L"explorer", // Windows Explorer
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92 L"taskeng", // Task Scheduler Engine
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93 L"taskhost", // Host Process for Windows Tasks
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94 L"taskhostex", // Host Process for Windows Tasks
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95 L"Taskmgr", // Task Manager
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96 };
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97
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98 return !name.empty() && !invalid_names.count(name);
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99 }
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100
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101 ////////////////////////////////////////////////////////////////////////////////
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102
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103 static BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM param) {
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104 if (!::IsWindowVisible(hwnd))
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105 return TRUE;
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106
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107 if (!VerifyWindowStyle(hwnd))
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108 return TRUE;
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109
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110 Window window;
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111 window.id = static_cast<unsigned int>(reinterpret_cast<ULONG_PTR>(hwnd));
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112 window.text = ToUtf8String(GetWindowText(hwnd));
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113
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114 {
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115 std::wstring class_name = GetWindowClassName(hwnd);
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116 window.class_name = ToUtf8String(class_name);
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117 if (!VerifyClassName(class_name))
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118 return TRUE;
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119 }
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120
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121 Process process;
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122 process.pid = GetWindowProcessId(hwnd);
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123 process.name = fd::GetProcessName(process.pid)
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124
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125 auto& window_proc = *reinterpret_cast<window_proc_t*>(param);
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126 if (!window_proc(process, window))
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127 return FALSE;
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128
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129 return TRUE;
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130 }
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131
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132 bool EnumerateWindows(window_proc_t window_proc) {
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133 if (!window_proc)
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134 return false;
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135
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136 const auto param = reinterpret_cast<LPARAM>(&window_proc);
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137
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138 // Note that EnumWindows enumerates only top-level windows of desktop apps
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139 // (as opposed to UWP apps) on Windows 8 and above.
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140 return ::EnumWindows(EnumWindowsProc, param) != FALSE;
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141 }
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142
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143 } // namespace animone::internal::win32
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