线程函数里if(File_dlg.DoModal()==IDOK)

djh512 2010-09-10 01:40:18

请问一下在线程函数里面



CFileDialog File_dlg(FALSE, _T(""), strname, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("*.*"));

if(File_dlg.DoModal()==IDOK)

这一句DoModal没有执行，没有弹出窗口
而改成下面的代码，去掉if就可以弹出窗口



CFileDialog File_dlg(FALSE, _T(""), strname, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T("*.*"));

File_dlg.DoModal()；

求解问什么？

...全文

213 12 打赏收藏转发到动态举报

写回复

用AI写文章

12 条回复

切换为时间正序

请发表友善的回复…

发表回复

anyingliesou 2010-09-13

打赏
举报

你可以看看File_dlg.DoModal()；现在返回什么值,然后再参考问题.

随遇而安的牛人 2010-09-13

打赏
举报

不应该的事

xiguapigeinichi 2010-09-11

打赏
举报

不应该啊~~~

孤客天涯 2010-09-10

打赏
举报

比较诡异,哈哈，应该是其他原因引起的吧

Eleven 2010-09-10

打赏
举报

应该不会吧

xgPaul 2010-09-10

打赏
举报

可能你的对话框被关闭了。。。

arong1234 2010-09-10

打赏
举报

任何一个线程都可以创建，他这里肯定有其他问题：如一个对话框刚关了，又试图弹出这个窗口，就会有问题[Quote=引用 3 楼 lifecode 的回复:]
可能问题在“在线程函数里面”这句话里，应该由主线程创建窗口。
[/Quote]

dinjay 2010-09-10

打赏
举报

既然去掉IF可以就应该不是主线程问题，很诡异啊。
LZ可以试试在主线程中去弹文件框，尽量不要在子线程中做涉及到UI的工作。

wolffan3150 2010-09-10

打赏
举报

顶楼上的，在线程函数里面有问题

lifecode 2010-09-10

打赏
举报

可能问题在“在线程函数里面”这句话里，应该由主线程创建窗口。

dickbarry 2010-09-10

打赏
举报

就是不该吧？
有这等事？

dengzikun 2010-09-10

打赏
举报

不应该吧,

if(File_dlg.DoModal()==IDOK)
{
return ;
}

void CPPlayerDlg::OnButton1() { // TODO: Add your control notification handler code here char szFileFilter[]= "Mp3 File(*.mp3)|*.mp3|" "Wma File(*.wma)|*.wma|" "Video File(*.dat)|*.dat|" "Wave File(*.wav)|*.wav|" "AVI File(*.avi)|*.avi|" "Movie File(*.mov)|*.mov|" "Media File(*.mmm)|*.mmm|" "Mid File(*.mid;*,rmi)|*.mid;*.rmi|" "MPEG File(*.mpeg)|*.mpeg|" "All File(*.*)|*.*||"; CFileDialog dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY,szFileFilter); if(dlg.DoModal()==IDOK){ CString PathName=dlg.GetPathName(); PathName.MakeUpper(); m_bfq.SetUrl(PathName); m_show=PathName; m_msg="播放"; UpdateData(FALSE); } } void CPPlayerDlg::OnButton3() { // TODO: Add your control notification handler code here m_bfq.GetControls().play(); m_msg="播放"; UpdateData(FALSE); } void CPPlayerDlg::OnButton4() { // TODO: Add your control notification handler code here m_bfq.GetControls().pause(); m_msg="暂停"; UpdateData(FALSE); } void CPPlayerDlg::OnButton5() { // TODO: Add your control notification handler code here m_bfq.GetControls().stop(); m_msg="停止"; UpdateData(FALSE); } void CPPlayerDlg::OnButton2() { // TODO: Add your control notification handler code here AfxGetMainWnd()->SendMessage(WM_CLOSE); }

VC 6.0 按顺序逐行读取TXT每行的数据内容，一行一行读取，基本的步骤和思路是：创建文件对话框、获得文件路径、打开文件、读文件、关闭文件。下面来看看具体的代码实现：　　//创建文件对话框　　CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | 　　 OFN_OVERWRITEPROMPT, _T("文本文件(*.*)|*.*||")); 　　if (dlg.DoModal() == IDOK) 　　{ 　　 //获得文件路径　　 CString strPathName = dlg.GetPathName(); 　　 CStdioFile file; 　　 //打开文件　　 if (!file.Open(strPathName, CFile::modeRead)) 　　 { 　　 ::AfxMessageBox(_T("文件打开失败。")); 　　 return; 　　 } 　　 //读文件　　 CString strText = _T(""); 　　 while (file.ReadString(strText)) 　　 { 　　 pListBox->AddString(strText); 　　 } 　　 //关闭文件　　 file.Close(); 　　}

基于DirectSound的简易播放器 #include "stdafx.h" #include "test.h" #include "testDlg.h" #include "process.h" #ifdef _DEBUG #define new DEBUG_NEW #endif // CAboutDlg dialog used for App About class CAboutDlg : public CDialog { public: CAboutDlg(); // Dialog Data enum { IDD = IDD_ABOUTBOX }; protected: virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support // Implementation protected: DECLARE_MESSAGE_MAP() }; CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) { } void CAboutDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) END_MESSAGE_MAP() // CtestDlg dialog CtestDlg::CtestDlg(CWnd* pParent /*=NULL*/) : CDialog(CtestDlg::IDD, pParent) { m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); } void CtestDlg::DoDataExchange(CDataExchange* pDX) { CDialog::DoDataExchange(pDX); } BEGIN_MESSAGE_MAP(CtestDlg, CDialog) ON_WM_SYSCOMMAND() ON_WM_PAINT() ON_WM_QUERYDRAGICON() //}}AFX_MSG_MAP ON_BN_CLICKED(IDC_BUTTON_OPEN, &CtestDlg::OnBnClickedButtonOpen) ON_BN_CLICKED(IDC_BUTTON_PLAY, &CtestDlg::OnBnClickedButtonPlay) ON_WM_DESTROY() ON_BN_CLICKED(IDC_BUTTON_STOP, &CtestDlg::OnBnClickedButtonStop) END_MESSAGE_MAP() //ON_BN_CLICKED(IDC_Sound_Play, OnSound2) //ON_BN_CLICKED(IDC_Sound_stop, OnSound1) //ON_BN_CLICKED(IDC_sound_pause, OnBothSounds) //ON_WM_DESTROY() //ON_BN_CLICKED(IDC_BUTTON_Slow, OnBUTTONSlow) //ON_BN_CLICKED(IDC_BUTTON_Fast, OnBUTTONFast) //ON_BN_CLICKED(IDC_BUTTON_Normal, OnBUTTONNormal) // CtestDlg message handlers BOOL CtestDlg::OnInitDialog() { CDialog::OnInitDialog(); // Add "About..." menu item to system menu. // IDM_ABOUTBOX must be in the system command range. ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ASSERT(IDM_ABOUTBOX < 0xF000); CMenu* pSysMenu = GetSystemMenu(FALSE); if (pSysMenu != NULL) { CString strAboutMenu; strAboutMenu.LoadString(IDS_ABOUTBOX); if (!strAboutMenu.IsEmpty()) { pSysMenu->AppendMenu(MF_SEPARATOR); pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } } // Set the icon for this dialog. The framework does this automatically // when the application's main window is not a dialog SetIcon(m_hIcon, TRUE); // Set big icon SetIcon(m_hIcon, FALSE); // Set small icon // TODO: Add extra initialization here m_sndSound1 = new CDirectSound(); if(!m_sndSound1) { exit(-1); } return TRUE; // return TRUE unless you set the focus to a control } void CtestDlg::OnSysCommand(UINT nID, LPARAM lParam) { if ((nID & 0xFFF0) == IDM_ABOUTBOX) { CAboutDlg dlgAbout; dlgAbout.DoModal(); } else { CDialog::OnSysCommand(nID, lParam); } } // If you add a minimize button to your dialog, you will need the code below // to draw the icon. For MFC applications using the document/view model, // this is automatically done for you by the framework. void CtestDlg::OnPaint() { if (IsIconic()) { CPaintDC dc(this); // device context for painting SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc()), 0); // Center icon in client rectangle int cxIcon = GetSystemMetrics(SM_CXICON); int cyIcon = GetSystemMetrics(SM_CYICON); CRect rect; GetClientRect(&rect); int x = (rect.Width() - cxIcon + 1) / 2; int y = (rect.Height() - cyIcon + 1) / 2; // Draw the icon dc.DrawIcon(x, y, m_hIcon); } else { CDialog::OnPaint(); } } // The system calls this function to obtain the cursor to display while the user drags // the minimized window. HCURSOR CtestDlg::OnQueryDragIcon() { return static_cast(m_hIcon); } //--------------------------------------------------------------------------------- void CtestDlg::OnBnClickedButtonOpen() { // TODO: Add your control notification handler code here LPCTSTR lpszFilter =L"Wave File(*.wav)|*.wav|All Files|*.*||"; CFileDialog dlg(TRUE,NULL,NULL,/*OFN_HIDEREADONLY |*/ OFN_OVERWRITEPROMPT,lpszFilter); if(dlg.DoModal()==IDOK) { m_soundfile = dlg.GetPathName(); } } // unsigned int WINAPI FileReadProc(LPVOID pOwner) { CtestDlg* pThis = (CtestDlg*)pOwner; pThis->ReadFileProc(); return 1; } // typedef struct _WAVE_FORMAT { WORD AudioFormat; WORD NumChannels; DWORD SampleRate; DWORD ByteRate; WORD BlockAlign; WORD BitsPerSample; }WAVE_FORMAT,*PWAVE_FORMAT; void CtestDlg::OnBnClickedButtonPlay() { // TODO: Add your control notification handler code here if(m_soundfile.IsEmpty()) { MessageBox(L"请选中播放文件！"); return; } USES_CONVERSION; fp = fopen(W2A(m_soundfile.GetBuffer(m_soundfile.GetLength())),"rb"); if(NULL == fp) { MessageBox(L"打开所所定的播放文件失败,请确认文件是否存在！"); return; } fseek(fp,20,0); //Skip previous 20 bytes RIFF header WAVE_FORMAT waveFormat; int nLen =fread(&waveFormat,1,sizeof(WAVE_FORMAT),fp); AUDIO_CONFIG WaveHead; WaveHead.wFormatTag = 1; WaveHead.nChannels = 2; WaveHead.nSamplesPerSec = 44100; WaveHead.nAvgBytesPerSec = 176400; WaveHead.nBlockAlign = 4; WaveHead.wBitsPerSample = 16; WaveHead.nBlockAlign=waveFormat.BlockAlign; WaveHead.nChannels=waveFormat.NumChannels; WaveHead.nSamplesPerSec=waveFormat.SampleRate; WaveHead.wBitsPerSample=waveFormat.BitsPerSample; WaveHead.nAvgBytesPerSec=waveFormat.ByteRate; m_sndSound1->CreateDSound(&WaveHead,8000); fseek(fp,20+sizeof(WAVE_FORMAT),0); unsigned int dwReadID; m_hThread = (HANDLE)_beginthreadex(0,0,FileReadProc,this,0,&dwReadID); Sleep(200); m_bStop = 0; m_bContine = 1; m_sndSound1->Play(); } void CtestDlg::ReadFileProc() { //BYTE buf[1025]; int n = 0; while(1) { BYTE buf[1025]; int nlen; if(m_bStop) break; nlen = fread(buf,1,1024,fp); if(!nlen) break; while(m_sndSound1->WriteDataToBuf(buf,nlen)==-1) { Sleep(100); } } if(fp) { fclose(fp); fp = NULL; } } void CtestDlg::OnDestroy() { CDialog::OnDestroy(); // TODO: Add your message handler code here m_bStop = 1; OnBnClickedButtonStop(); if(m_hThread) { WaitForSingleObject(m_hThread,2000); CloseHandle(m_hThread); m_hThread = 0; } if(m_sndSound1) { delete m_sndSound1; m_sndSound1 = NULL; } if(fp) { fclose(fp); fp = NULL; } } void CtestDlg::OnBnClickedButtonStop() { // TODO: Add your control notification handler code here m_bStop = 1; if(m_hThread) { WaitForSingleObject(m_hThread,2000); CloseHandle(m_hThread); m_hThread = NULL; } m_sndSound1->Stop(); }

CWMPPlayer4类做的视频播放器举例： 1. 新建一个基于对话框的应用程序 2. 删除默认控件，增加一个按钮控件，ID设为ID_OPEN; 3. 在对话框的空白处右键插入ActiveX控件，选择Windows Media Player。注意：路径为C:\WINDOWS\system32\wmp.dll 4. 为ActiveX控件关联一个CWMPPlayer4类型的变量m_player;注意，添加相应的类。（这些有VC6.0自动添加） 5. 为第2步的按钮控件添加消息处理响应函数，实现文件的打开，并将文件的路径设置为m_player的播放路径。代码如下： char szFileFilter[]="Mp3 File(*.mp3)|*.mp3|" "Wma File(*.wma)|*.wma|" "Video File(*.dat)|*.dat|" "Wave File(*.wav)|*.wav|" "AVI File(*.avi)|*.avi|" "Movie File(*.mov)|*.mov|" "Media File(*.mmm)|*.mmm|" "Mid File(*.mid;*,rmi)|*.mid;*.rmi|" "MPEG File(*.mpeg)|*.mpeg|" "All File(*.*)|*.*|| ";//文件类型过滤 CFileDialog dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY,szFileFilter); if(dlg.DoModal()==IDOK) { CString PathName=dlg.GetPathName(); PathName.MakeUpper(); m_player.SetUrl(PathName); }

自己写的数据库大作业，用MFC ODBC +access 写的内含完整工程，解压后就能用 // MainFrm.cpp : implementation of the CMainFrame class // #include "stdafx.h" #include "ODBCdemo.h" #include "MainFrm.h" #include "BrwMessagedlg.h" #include "ReaderAdmindlg.h" #include "BookUpdatedlg.h" #include "LogIndlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMainFrame IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd) BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd) //{{AFX_MSG_MAP(CMainFrame) ON_WM_CREATE() ON_COMMAND(ID_BCG, OnBcg) ON_COMMAND(IDD_ReaderUpdate, OnReaderUpdate) ON_COMMAND(IDBK_UPDATE, OnBookUpdate) //}}AFX_MSG_MAP END_MESSAGE_MAP() static UINT indicators[] = { ID_SEPARATOR, // status line indicator ID_INDICATOR_CAPS, ID_INDICATOR_NUM, ID_INDICATOR_SCRL, }; ///////////////////////////////////////////////////////////////////////////// // CMainFrame construction/destruction CMainFrame::CMainFrame() { // TODO: add member initialization code here m_bAutoMenuEnable=FALSE; } CMainFrame::~CMainFrame() { } int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CFrameWnd::OnCreate(lpCreateStruct) == -1) return -1; if (!m_wndStatusBar.Create(this) || !m_wndStatusBar.SetIndicators(indicators, sizeof(indicators)/sizeof(UINT))) { TRACE0("Failed to create status bar\n"); return -1; // fail to create } if (!m_wndDlgBar.Create(this, IDD_DIALOGBAR, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC, IDD_DIALOGBAR)) { TRACE0("Failed to create dialogbar\n"); return -1; // fail to create } m_wndDlgBar.EnableDocking(CBRS_ORIENT_HORZ); EnableDocking(CBRS_ALIGN_ANY); DockControlBar(&m_wndDlgBar); CLogIndlg cdlg; if( cdlg.DoModal()==IDOK) { if(cdlg.role=="读者") { for(int i=0;iGetSubMenu(i)->EnableMenuItem(1,MF_BYPOSITION|MF_GRAYED); } } else Destroy

进程/线程/DLL

15,471

社区成员

49,182

社区内容

发帖

与我相关

我的任务

社区管理员

加入社区

近7日
近30日
至今

加载中

查看更多榜单

社区公告

暂无公告

试试用AI创作助手写篇文章吧

+ 用AI写文章