如何将小部件作为client_data传递给Xt/Motif信号处理程序？

#include <Xm/Xm.h>
#include <Xm/PushB.h>

typedef struct {
    Widget widget;
    int data;
} MyData;

void buttonCallback(Widget widget, XtPointer client_data, XtPointer call_data) {
    MyData* data = (MyData*)client_data;
    Widget button = data->widget;
    int value = data->data;

    // 在这里可以使用button和value进行相应的操作
}

int main(int argc, char **argv) {
    Widget topLevel;
    Widget button;
    XtAppContext app;

    topLevel = XtVaAppInitialize(&app, "MyApp", NULL, 0, &argc, argv, NULL, NULL);

    // 创建一个结构体，并设置需要传递的小部件和数据
    MyData data;
    data.widget = button;
    data.data = 10;

    // 创建一个按钮，并将结构体作为client_data传递给按钮
    button = XtVaCreateManagedWidget("button", xmPushButtonWidgetClass, topLevel, NULL);
    XtAddCallback(button, XmNactivateCallback, buttonCallback, (XtPointer)&data);

    XtRealizeWidget(topLevel);
    XtAppMainLoop(app);

    return 0;
}