在Main Form開啟Form2, 然後按下Form2上的Button, 該Button會執行一個很久迴圈 若在此時我按Form2右上角的關閉系窗會無回應, 必須等到那個迴圈做完才能關閉Form2 我已加上Application->ProcessMessage(); 但還是沒用 很奇怪的是最大及最小化都可以馬上看出結果, 但唯獨close不能馬上作用 下面附上簡單的測試程式, 請各位大大幫忙看看, 謝謝    PS:若是用Form2->Show(); 則沒有上述問題    

//----以下為Unit1.cpp--------------------------------------------------
#include "Unit1.h"
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
   : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
   Form2->ShowModal();   //若是用Form2->Show(); 則沒有問題
}    //-----以下為Unit2.cpp------------------------------------------------
#include "Unit2.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm2 *Form2;
//---------------------------------------------------------------------------
__fastcall TForm2::TForm2(TComponent* Owner)
   : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm2::Button1Click(TObject *Sender)
{
   for(int i=0;i<100;i  )
   {
      Sleep(100);
      Application->ProcessMessages();
      Label1->Caption=i;   //請在此間按close試試
   }
}

這個問題我已在深度論壇問過了 有人回的答案是Modal 與 Modaless 的差別 但我還是找不到解法 我要的是如果一定要用ShowModal的方式 如何才能立刻收到OnClose()的Event

davidchang 你好: 依照你目前的解決方法，再加上以下修改的 code 希望能夠更符合你的需求~~參考看看吧 < class="code"> //----以下為Unit1.cpp-------------------------------------------------------- #include "Unit1.h" #include "Unit2.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { Form2->Show(); } //-----以下為Unit2.cpp------------------------------------------------------- #include "Unit2.h" bool bf2; //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm2 *Form2; //--------------------------------------------------------------------------- __fastcall TForm2::TForm2(TComponent* Owner) : TForm(Owner) { } //--------------------------------------------------------------------------- void __fastcall TForm2::Button1Click(TObject *Sender) { for(int i=0; i<100; i ) { if(!bf2) break; Sleep(100); Application->ProcessMessages(); Label1->Caption=i; } } //--------------------------------------------------------------------------- void __fastcall TForm2::FormClose(TObject *Sender, TCloseAction &Action) { bf2=false; Label1->Caption=""; } //--------------------------------------------------------------------------- void __fastcall TForm2::FormDeactivate(TObject *Sender) { if(bf2) SetFocus(); } //--------------------------------------------------------------------------- void __fastcall TForm2::FormShow(TObject *Sender) { bf2=true; Label1->Caption=""; } //--------------------------------------------------------------------------- 備註: 如果覺得這個 solution 不錯的話 不妨跟網友們一起分享你的辦法喔 --

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引言: RaynorPao大大 ... 好像有點問題 loop 裡的 if(bf2) break; ... 應該是 if (!bf2) break; 吧? 不好意思 ... < face="Verdana, Arial, Helvetica"> FrederickPau 你好: 謝謝你的提醒~~打太快錯了< > 上面的程式碼已經修正 如果還有錯要告訴我喔< > -- Enjoy Researching & Developing --

這個方法我也用過, 可是只要是 show modal 就掛了, 再想想有沒有什麼在 show modal 下可以用的方法. Jesse Chan

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Jesse Chan

application->processmessage只是在loop中可接受其他message並不會幫你結束loop. 如下試試吧    unit2.h

class TForm2 : public TForm
{
__published:        // IDE-managed Components
        TButton *Button1;
        TLabel *Label1;
        TButton *Button2;
        void __fastcall Button1Click(TObject *Sender);
        void __fastcall FormActivate(TObject *Sender);
private:        // User declarations
public:                // User declarations
        __fastcall TForm2(TComponent* Owner);
        void __fastcall MyWndProc(Messages::TMessage &Message);
};    

unit2.cpp

bool canclose;    TForm2 *Form2;
//---------------------------------------------------------------------------
__fastcall TForm2::TForm2(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------    void __fastcall TForm2::Button1Click(TObject *Sender)
{
  for(int i=0;i<100;i  )
  {
    if (canclose) break;
    Sleep(100);
    Application->ProcessMessages();
    Label1->Caption=i;
  }
}
//---------------------------------------------------------------------------
void __fastcall TForm2::MyWndProc(Messages::TMessage &Message)
{
  if (Message.Msg == WM_CLOSE)
  {
    canclose=True;
    Close();
  }
  else
    WndProc(Message);
}    void __fastcall TForm2::FormActivate(TObject *Sender)
{
  this->WindowProc=MyWndProc;
}
//---------------------------------------------------------------------------

sorry...上星期太忙了... 一直沒機會試試..    用ccchen的方法就可以達到我要的功能 所以分數就給他囉 不過還是要謝謝各位的幫忙... 尤其是RaynorPao...

試出另一個方法, 原理是一樣的, 給大家參考    unit2.h

//---------------------------------------------------------------------------
class TForm2 : public TForm
{
__published:        // IDE-managed Components
   TLabel *Label1;
   TButton *Button1;
   TButton *Button2;
   TTimer *Timer1;
   void __fastcall Button1Click(TObject *Sender);
   void __fastcall Button2Click(TObject *Sender);
   void __fastcall FormClose(TObject *Sender, TCloseAction &Action);
   void __fastcall Timer1Timer(TObject *Sender);
   void __fastcall FormActivate(TObject *Sender);
private:        // User declarations
public:                // User declarations
   __fastcall TForm2(TComponent* Owner);
   void __fastcall MyClose(TMessage &Message);       BEGIN_MESSAGE_MAP
      MESSAGE_HANDLER(WM_CLOSE,TMessage,MyClose)
   END_MESSAGE_MAP(inherited)
};    unit2.cpp    bool canclose=false;
//---------------------------------------------------------------------------
__fastcall TForm2::TForm2(TComponent* Owner)
   : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm2::Button1Click(TObject *Sender)
{
   for(int i=0;i<100;i  )
   {
      Sleep(100);
      if(canclose)   break;
      Application->ProcessMessages();
      Label1->Caption=i;
   }
}
//---------------------------------------------------------------------------
void __fastcall TForm2::MyClose(TMessage &Message)
{
   canclose=true;
   Close();
}
//---------------------------------------------------------------------------

引言: 用ccchen的方法就可以達到我要的功能 所以分數就給他囉 不過還是要謝謝各位的幫忙... 尤其是RaynorPao... < face="Verdana, Arial, Helvetica"> davidchang 你好: 放心~~我不會介意的< > 也很感謝你的熱心分享< > -- Enjoy Researching & Developing --