新手提问:为什么加了对话框后,MessageBox显示不出来?

[long33]

以下是源程序,*********夹着的是要显示的MessageBox
#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "resource.h"


HWND hDlg;
HINSTANCE hInst;

//declarations
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
BOOL CALLBACK DlgProc(HWND,UINT,WPARAM,LPARAM);


//WinMain function
int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInst,
LPSTR lpszCmdLine,
int nCmdShow)
{
HWND hwnd;
MSG msg;
HACCEL hAccel;
WNDCLASS wndclass;

char lpszClassName[] = "Dialog";
char lpszTitle[] = "Dialog";
char lpszMenuName[] = "Menu";

wndclass.style = 0;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH);
wndclass.lpszClassName = lpszClassName;
wndclass.lpszMenuName = lpszMenuName;

RegisterClass(&wndclass);


hwnd = CreateWindow(lpszClassName,
lpszTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);

ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);

hInst = hInstance;
hAccel = LoadAccelerators(hInst,lpszMenuName);


while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);

}

return msg.wParam;
}

//message function
LRESULT CALLBACK WndProc( HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch(message)
{
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDM_NEW:
//////////**********************************************************
///////// 就这里,加载了,但是显示不出来,这是为什么?
MessageBox(hwnd,"Open","Open",MB_OK);
/////////***********************************************************
break;
case IDM_EXIT:
SendMessage(hwnd,WM_DESTROY,0,0);
break;
case IDM_ABOUT:
DialogBox(hInst,"About",hwnd,(DLGPROC)DlgProc);
break;
}
break;

case WM_PAINT:
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return 0;
}

BOOL CALLBACK DlgProc(HWND hdlg,UINT message,WPARAM wParam,LPARAM lParam)
{
switch(message)
{
case WM_INITDIALOG:
return true;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDOK:
EndDialog(hdlg,0);
return true;
}
break;
case WM_CLOSE:
EndDialog(hdlg,0);
return true;
}
return false;
}

[lyl_rabbit]

代码好长啊，不看了

[菜牛]

到底更对话框有关还是无关？如果对话框显示了（模式），当然主窗口不能继续处理其他消息。

[long33]

与对话框无关.我建一个简单的窗口.然后加载菜单,在File-> new 中要显示MessageBox也不行.
这个程序就是最基本的API写的窗口(初学者),只是验证书上的例子,发现这个问题,实在搞不懂.

[布学无数]

检查一下是不是没有收到这个消息！！！

[sycnick]

你确定，调用到了？

[long33]

嗯,调用到了,焦点不能切到主窗口,就是没有显示出来.

[long33]

好像调用非模态对话框时也有这个问题

[long33]

我把所有源文件发出来,请帮忙调试一下
//res.rc
//Microsoft Developer Studio generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// Chinese (P.R.C.) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)
#ifdef _WIN32
LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
#pragma code_page(936)
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE DISCARDABLE
BEGIN
"resource.h\0"
END

2 TEXTINCLUDE DISCARDABLE
BEGIN
"#include ""afxres.h""\r\n"
"\0"
END

3 TEXTINCLUDE DISCARDABLE
BEGIN
"\r\n"
"\0"
END

#endif // APSTUDIO_INVOKED

#endif // Chinese (P.R.C.) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif // not APSTUDIO_INVOKED

Menu MENU DISCARDABLE
BEGIN
POPUP "File(&F)"
BEGIN
MENUITEM "New(&N)\t Ctrl+N", IDM_NEW
MENUITEM "Open(&O)\t Ctrl+O", IDM_OPEN
MENUITEM SEPARATOR
MENUITEM "Exit(&X)", IDM_EXIT
END
POPUP "Help(&H)"
BEGIN
MENUITEM "About(&A)..", IDM_ABOUT
END
END

Menu ACCELERATORS
BEGIN
"^N", IDM_NEW
"^O", IDM_OPEN
VK_DELETE,IDM_DELETE,VIRTKEY
END

About DIALOG 50,50,100,50
STYLE WS_POPUP | WS_CAPTION | WS_SYSMENU | WS_VISIBLE
CAPTION "About"
FONT 12,"楷体"
{
CTEXT "Example of dialog",-1,13,10,80,10
DEFPUSHBUTTON "OK",IDOK,35,30,30,12
}

[Victorianism]

断点调度

[Victorianism]

断点调试

[long33]

//resource.h

//{{NO_DEPENDENCIES}}
// Microsoft Developer Studio generated include file.
// Used by res.rc
//




#define IDM_NEW 10
#define IDM_OPEN 11
#define IDM_CLOSE 12
#define IDM_SAVE 13
#define IDM_SAVEAS 14
#define IDM_EXIT 15
#define IDM_CUT 16
#define IDM_COPY 17
#define IDM_PASTE 18
#define IDM_DELETE 19
#define IDM_ABOUT 20

// Next default values for new objects
//
#ifdef APSTUDIO_INVOKED
#ifndef APSTUDIO_READONLY_SYMBOLS
#define _APS_NEXT_RESOURCE_VALUE 101
#define _APS_NEXT_COMMAND_VALUE 40001
#define _APS_NEXT_CONTROL_VALUE 1000
#define _APS_NEXT_SYMED_VALUE 101
#endif
#endif

实在搞不懂问题出在哪........好像跟对话框无关...