I found the reason why it didn't work before the `gtk_widget_show_all` call
Basically, the `gtk_widget_show_all` function creates the `GdkWindow`, since to
create the `GdkWindow` you need to realize the `GtkWindow`, which the
`gtk_widget_show_all` function does. But there are other functions that realize
the `GtkWindow`, one of them is `gtk_widget_realize`, which only realize the
`GtkWindow`, without showing the window or anything else. So if we call
`gtk_widget_realize` before the `gtk_widget_get_window` function, we can get
the `GdkWindow`.
So the __Perfect Code__ is
### Perfect Code
```c
#include <gtk/gtk.h>
#include <windows.h>
#include <dwmapi.h>
#include <gdk/gdkwin32.h>
BOOL ShouldAppsUseDarkMode() {
BOOL isLight = TRUE;
DWORD val, dataSize = sizeof(val);
const char *REG_PATH =
"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize";
const char *REG_VAR = "AppsUseLightTheme";
if (RegGetValueA(HKEY_CURRENT_USER, REG_PATH, REG_VAR, RRF_RT_DWORD,
NULL, &val, &dataSize) == ERROR_SUCCESS) {
isLight = val;
}
else {
g_warning("Failed to get AppsUseLightTheme from Reg.");
}
return !isLight;
}
void current_mode_titlebar(GtkWidget *window) {
GdkWindow *gdk_window = gtk_widget_get_window(window);
if (gdk_window) {
HWND hwnd = (HWND)gdk_win32_window_get_handle(gdk_window);
if (hwnd) {
BOOL use_dark_mode = ShouldAppsUseDarkMode();
DwmSetWindowAttribute(hwnd,
DWMWA_USE_IMMERSIVE_DARK_MODE, &use_dark_mode, sizeof(use_dark_mode));
} else {
g_warning("Failed to get HWND from GdkWindow.");
}
} else {
g_warning("Failed to get GdkWindow from GtkWidget.");
}
}
int main(int argc, char *argv[]) {
GtkWidget *window;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Dark Mode Title Bar");
gtk_window_set_default_size(GTK_WINDOW(window), 400, 300);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
gtk_widget_realize(window);
current_mode_titlebar(window);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
```
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