How to call a Dialog Box?

How to call a Dialog Box?

• Jason Zhao

  There are many way.
  
  Does WinMain call DataSender If it does then you can just return a value from DataSender() or give DataSender an out parameter. Here are three alternatives:
  
  // a1.cpp
  extern int DataSender();
  
  int WinMain()
  {
     int retValue = DataSender();
  }
  
  // a2.cpp
  extern void DataSender(int& retvalue);
  
  int WinMain()
  {
     int retValue;
     DataSender(retValue);
  }
  
  // a3.cpp
  extern void DataSender(int* retvalue);
  
  int WinMain()
  {
     int retValue;
     DataSender(&retValue);
  }

  
  
  

• erock12

  OK I got that!
  It is a Windows Application, so I'm OK using WinMain in cpp1.
  so in cpp2 I don't use main function. Alrighty then!
  How do I make it that cpp2 function, lets call it DataSender() sends information to WinMain()
  
  
  
  

• Mike V. @ AHL

  Here's an even better MFC link:
  
  http://msdn.microsoft.com/library/default.asp url=/library/en-us/vccore/html/vchowexampledisplayingdialogboxviamenuoption.asp
  
  

• NileshGarje

  As this is the entry point to the program the arguments are provided by whatever invokes your program: in this case the Windows system itself.
  
  Here is what MSDN has to say about the WinMain function and its arguments:
  
  http://msdn.microsoft.com/library/default.asp url=/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/winmain.asp
  
  If you don't care about any of these arguments then it is OK to remove them from the signature. It is similar to the regular main function: the full signature is:
  
  int __cdecl main(int argc, char** argv)
  {
  }
  
  but for a lot of simple programs the following is sufficient:
  
  int __cdecl main()
  {
  }
  
  Note: to avoid possible linkage problems due to mis-matched calling conventions you should always keep the calling convention specifier. So use:
  
  int APIENTRY WinMain()
  {
  }
  
  instead of:
  
  int WinMain()
  {
  }
  
  

• Matrose

  The entry point for your program depends on the type of application you are building. Is is a console application (main), a Windows application (WinMain), a Windows DLL (DllMain) or Windows Forms application (main or maybe Main). Each program can only have one entry point and to avoid confusion you probably should not have any other global functions called main, WinMain or DllMain.

  
  
  

• CRSL

  You might find these topics useful:
  
  http://msdn.microsoft.com/library/default.asp url=/library/en-us/vbcon/html/vbtskdisplayingdialogbox.asp
  http://msdn2.microsoft.com/library/2chz8edb(en-us,vs.80).aspx
  
  

• Jil

  What technology are you using Win32, MFC, ATL, WinForms A search for "Dialog Box" on msdn.microsoft.com shows a lot of hits. Here's an MFC related one:
  
  http://msdn.microsoft.com/library/default.asp url=/library/en-us/vclib/html/_mfc_cdialog.asp
  
  Each project can only only one entry point: main, wmain, WinMain, DllMain, etc.
  
  If you all your C++ files are part of the same project then the linker will be invoked automatically: you don't need to do anything.
  
  

• XcoRpio

  Thanks for the links. I think thats what I need!
  Ok, so I use WinMain as main function.
  What about other cpp files Is it legal for them to have int main(void) function (without it it would report compile errors)
  I dont know much about linking, so could you clarify me that
  Look, lets look at my project like this: (it has more thingies but this is enough for the linking explination, I think)
  1st cpp:
  has WinMain function and it calls a main form. There is a space for text in this format
  integer : integer . integer
  these three integer shoud be obtained from the 2nd cpp
  2nd cpp:
  It counts the time spent on the Internet.
  It sends information to WinMain every second.
  Information are int hours, int minutes, int seconds.
  
  
  
  

• BigFred

  Oh, so I use DataSender() from 2nd cpp like it is a function from 1st cpp
  And I need to write a prototype of that function in the 1st cpp and with description "extern" to tell WinMain() to look for it in the linked cpps. OK thats clear!
  
  What is the difference between:
  

  int WinMain() {}

  
  and
  

  int APIENTRY WinMain(HINSTANCE hInstance,                      HINSTANCE hPrevInstance,                      LPTSTR  lpCmdLine,                      int nCmdShow)  {}

  
  I know that the second one takes argumnets, but....from where
  
  

• gika2002

  Thank you! You helped greatly.
  I'm having problem calling a form from a form.
  I've made a main form which is ran from the main function called Program.
  It has its program.cpp file from where it is called and program.h where the look of the form is coded. I have main menu on that form too.
  I also have another form. Modified like a dialog box. Its called Alarm. It also has alarm.cpp and alarm.h files.
  I want to make it so that when I press Alarm on the main menu of form Program, form Alarm (aka Dialog Box) appears.
  I know that I need to add this code
  

  private: System::Void AlarmMenu_Click(System::Object * sender, System::EventArgs * e) { }

  
  to namespace Program{} which is in the program.h file.
  AlarmMenu is the name of the "button" on the main menu under program form that should call alarm form.
  I also know that call has to be inside the brackets {"tha code"} but I just don't know hot to make the call.
  Any help would be most welcome.
  (I've read some info about dialog boxes at msdn but I still don't get it)
  
  
  
• How to call a Dialog Box?