如何避免软件的重复运行？

[zhaoxinghan]

想设计一个软件，用户在同一时间只能开启一个，一台电脑不能同时运行多个，应怎么设计？

[___NULL]

给你个最简单的，修改一下 WinMain 函数即可

WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
try
{
HANDLE hMutex=CreateMutex(NULL,TRUE,"jf9i3hscb 随便写啦");
if(hMutex==NULL||GetLastError() == ERROR_ALREADY_EXISTS)
{
MessageBox(NULL,"系统中已存在一个正在运行的副本","XXX",MB_OK);
CloseHandle(hMutex);
return FALSE;
}

Application->Initialize();
Application->CreateForm(__classid(TMainForm), &MainForm);
Application->CreateForm(__classid(TAboutBox), &AboutBox);
// Application->ShowMainForm = false;
Application->Run();
}
catch (Exception &exception)
...

[jacknes009]

//---------------------------------------------------------------------------
#include <string.h>
#include <fstream.h>
#include <vcl.h>
#pragma hdrstop
//---------------------------------------------------------------------------
USEFORM("Unit1.cpp", Form1);
//---------------------------------------------------------------------------
const string FMutex = "Mutex_ONLY_ONE";
//---------------------------------------------------------------------------


WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
try
{ /*
var
hMutex: HWND;
iRet: integer;
begin
Application.Initialize;
hMutex := CreateMutex(nil,False,PChar(FMutex));
iRet := GetLastError;
if iRet <>ERROR_ALREADY_EXISTS then
begin
Application.CreateForm(TForm1, Form1);
Application.Run;
end;
ReleaseMutex(hMutex);
*/
HWND hMutex;
int iRet;
Application->Initialize();
hMutex = CreateMutex(NULL,False,FMutex.c_str());
iRet = GetLastError();
if(iRet != ERROR_ALREADY_EXISTS)
{
Application->CreateForm(__classid(TForm1), &Form1);
Application->Run();
}
else
{
ShowMessage("Message");
}
ReleaseMutex(hMutex);
}
catch (Exception &exception)
{
Application->ShowException(&exception);
}
catch (...)
{
try
{
throw Exception("");
}
catch (Exception &exception)
{
Application->ShowException(&exception);
}
}
return 0;
}
//---------------------------------------------------------------------------

[ccrun.com]

至少有三种以上的方法。

具体请查看FAQ。

[zhaoxinghan]

C++ builder的winmain函数应该怎么修改呢？不好意思，我很菜，能说的详细一些么？

[i_love_pc]

winmain函数在工程源文件下，如果你的工程名为Project1,那就打开Project1.cpp文件，按照一楼写的方法添加就可以。

[cczlp]

//--季老大的代码--------------------------------------------------------------------
class TSharedMem
{
private:
bool FCreated;
BYTE *FFileView;
HANDLE FHandle;
public:
TSharedMem(const char* Name, int Size);
~TSharedMem();

__property BYTE* Buffer = {read=FFileView};
__property bool Created = {read=FCreated};
};
TSharedMem::TSharedMem(const char* Name, int Size)
{
FHandle = CreateFileMapping((HANDLE)0xFFFFFFFF,
NULL, PAGE_READWRITE, 0, Size, Name);
if (FHandle != NULL)
{
FCreated = GetLastError() == 0;
FFileView = (BYTE*)MapViewOfFile(FHandle,
FILE_MAP_WRITE, 0, 0, Size);
if (FFileView && FCreated)
{
ZeroMemory(FFileView, Size);
}
}
else
{
FFileView = NULL;
}
}
TSharedMem::~TSharedMem()
{
if (FFileView)
{
UnmapViewOfFile(FFileView);
}
if (FHandle)
{
CloseHandle(FHandle);
}
}
/*
你可以直接使用这个class，来达到让程序只运行一个实例。方法如下：
WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
TSharedMem SharedMem("我的程序名", 8);
if (!SharedMem.Created) return 0;
try
{
Application->Initialize();
Application->CreateForm(__classid(TForm1), &Form1);
Application->Run();
}
catch (Exception &exception)
{
Application->ShowException(&exception);
}
return 0;
}
*/

[constantine]

看FAQ

[cczlp]

好像大家都忘记 FAQ 的存在了

[[e-mail]]

HANDLE hMutex 互斥方法

[yangar9179]

这么多人答了，来晚了，用互斥吧

[laowang2]

内存映射好点.

[truelove7283159]

来晚了

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