问题描述
我正在尝试使用 OptionMenu Motif Widget 编译一个基本窗口。
这是我试过的:
#include <Xm/Xm.h>
#include <Xm/PushB.h>
XtAppContext context;
xmstringCharSet char_set=xmsTRING_DEFAULT_CHARSET;
Widget toplevel;
Widget optionMenu;
Widget optionMenuItem1;
Widget optionMenuItem2;
Widget addMenuItem(char *itemName,XtPointer clientData,Widget menuWidget) {
int ac;
Arg al[10];
Widget item;
ac=0;
XtSetArg(al[ac],XmNlabelString,xmstringCreateLtoR(itemName,char_set)); ac++;
item=XmCreatePushButton(menuWidget,itemName,al,ac);
XtManageChild(item);
/*XtAddCallback(item,XmNactivateCallback,menuCB,clientData);*/
XtSetSensitive(item,True);
return(item);
}
int main(int argc,char *argv[]){
Arg al[10];
int ac;
/* CREATE TOP LEVEL */
toplevel = XtAppInitialize(&context,"test1",NULL,&argc,argv,0);
/* RESIZE TOP LEVEL */
ac=0;
XtSetArg(al[ac],XmNheight,300); ac++;
XtSetArg(al[ac],XmNwidth,300); ac++;
XtSetValues(toplevel,ac);
/* CREATE OPTIONS MENU */
ac=0;
optionMenu = XmCreateOptionMenu(toplevel,"optionMenu",ac);
XtManageChild(optionMenu);
optionMenuItem1 = addMenuItem("item1","Item 1",optionMenu);
optionMenuItem2 = addMenuItem("item2","Item 2",optionMenu);
/* disPLAY TOP LEVEL */
XtRealizeWidget(toplevel);
XtAppMainLoop(context);
}
这是我得到的编译警告,我不知道为什么会这样:
$ cc -std=c89 test1.c -I/usr/local/include -L/usr/local/lib -lXm -lXt -lX11
test1.c:45:13: warning: incompatible integer to pointer conversion assigning to 'Widget' (aka 'struct _WidgetRec *') from 'int' [-Wint-conversion]
optionMenu = XmCreateOptionMenu(toplevel,ac);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
$ ./a.out
Segmentation fault (core dumped)
因为我总是在没有警告的情况下编译东西,所以我想了解为什么会出现该警告并首先将其消除。
编辑:
如评论中所述,添加在 xmcreateoptionmenu
的手册页中指定的
另外,生成选项菜单的代码有误,我附上正确的。 请注意,没有为小部件分配标签:
#include <Xm/Xm.h>
#include <Xm/PushB.h>
#include <Xm/RowColumn.h>
XtAppContext context;
xmstringCharSet char_set=xmsTRING_DEFAULT_CHARSET;
Widget toplevel;
Widget pulldownMenu,optionMenu;
Widget optionMenuItem1;
Widget optionMenuItem2;
Widget addMenuItem(char *itemName,ac);
/* CREATE OPTIONS MENU */
pulldownMenu=XmCreatePulldownMenu(toplevel,"pulldownMenu",0);
optionMenuItem1 = addMenuItem("item1",pulldownMenu);
optionMenuItem2 = addMenuItem("item2",pulldownMenu);
ac=0;
XtSetArg(al[ac],XmNsubMenuId,pulldownMenu); ac++;
optionMenu = XmCreateOptionMenu(toplevel,ac);
XtManageChild(optionMenu);
/* disPLAY TOP LEVEL */
XtRealizeWidget(toplevel);
XtAppMainLoop(context);
}
解决方法
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