RT, I use c + + builder now developed A medium-sized program, need to call the B form in A form, after the call B open form, while minimizing artificially in A form click call again B form, not to repeat to open, how to form B B form of minimizing the original front display?

CodePudding user response:

FormB - & gt; WindowState=wsNormal;

CodePudding user response:

 

//"how B form not to open the" 
The static BYTE b=0; 
Void __fastcall TForm1: : btn1Click (TObject * Sender) 
{
TAboutBox * AboutBox=new TAboutBox (Application); 
If (b==0) 
AboutBox - & gt; Show (); 
B++; 
} 

CodePudding user response:

Embarrassed, we all did not understand what I mean, I have a problem, the expression of what I mean is almost for the first time. Double-click the inspector exe, then the window is opened, a second double-click the inspector again. Exe, the program will not repeat, first open can be carried in the front, from the background out,

CodePudding user response:

Open the Form before judgment about.
If (Application - & gt; FormB FindComponent (" ")!=NULL)
{
A new show out
}
The else
{
Directly show
}

CodePudding user response:

Use the mutex, application starts trying to open the mutually exclusive:
If can't open, you create a mutex and continues to run, to create a memory mapping, the main form of handle to Shared memory,
If can open, there is a instance, open the memory mapping, an instance from the Shared memory read main window handle, "bringing it to the front desk, and then the process exits,

CodePudding user response:

 
HANDLE hMutex; 
Const char * TXT="ha ha"; 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
USEFORM (" shell. The CPP, "FormMain); 
//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
WINAPI WinMain (HINSTANCE, HINSTANCE, LPSTR, int) 
{
Try 
{
HMutex=CreateMutex (NULL, FALSE, TXT); 

//check the error code 
If (GetLastError ()==ERROR_ALREADY_EXISTS) 
{
The CloseHandle (m_hMutex); 
The exit (EXIT_SUCCESS); 
} 
Application - & gt; The Initialize (); 
Application - & gt; Title="ha ha"; 
Application - & gt; CreateForm (__classid (TFormMain), & amp; FormMain); 
Application - & gt; The Run (); 
} 
The catch (Exception & amp; The exception) 
{
Application - & gt; ShowException (& amp; The exception); 
} 
The catch (... ) 
{
Try 
{
Throw Exception (" "); 
} 
The catch (Exception & amp; The exception) 
{
Application - & gt; ShowException (& amp; The exception); 
} 
} 
return 0; 
} 

CodePudding user response:

WINAPI WinMain (HINSTANCE, HINSTANCE, LPSTR, int)
{
Try
{
The HWND HWND;
HWnd=FindWindowEx (NULL, NULL, NULL, "software");
If (hWnd!=NULL)//find the old process
{
ShowWindow (hWnd, SW_SHOW);//show the old process

//ShowWindow (hWnd, SW_RESTORE);//BringWindowToTop (hWnd);//
The SetForegroundWindow (hWnd);//front the old process
return 0;//out of the current process

CodePudding user response:

refer to 6th floor sololie response:

C/C + + code
?



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HANDLE hMutex; Const char * TXT="ha ha";//-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -...

The positive solution is to open exe

CodePudding user response:

Demon elder brother said to, I just did not give an indicative code
WINAPI WinMain (HINSTANCE, HINSTANCE, LPSTR, int)
{
HANDLE hMutex=CreateMutex (NULL, False, "FormA");//create a mutex
If (hMutex==NULL | | : : GetLastError ()==ERROR_ALREADY_EXISTS)
{
ShowMessage (" Exits ");
HANDLE hWindow=FindWindow (NULL, "FormA");//get the already running instance handle
SendMessageA (hWindow, WM_SYSCOMMAND, SC_RESTORE, 0);//back to minimize the former instance
The SetForegroundWindow (hWindow);//the first instance is active
Application - & gt; The Terminate ();//end of this instance
}
Try
{
Application - & gt; The Initialize ();
Application - & gt; CreateForm (__classid (TForm1), & amp; Form1);
Application - & gt; The Run ();
}
The catch (Exception & amp; The exception)
{
Application - & gt; ShowException (& amp; The exception);
}
The catch (... )
{
Try
{
Throw Exception (" ");
}
The catch (Exception & amp; The exception)
{
Application - & gt; ShowException (& amp; The exception);
}
}
return 0;
}