遇到一特殊的要求，运行2个实例

[lovetsfuer]

只让运行一个实例方法很多，这次遇到一个特殊的要求，程序让在一台机器上只让最多运行2个实例，有神马好多思路没？

[ccrun.com]

zzb的代码存在逻辑漏洞，不同目录下的同名EXE会有误判。

[zzbinfo]

对，他只是判断有没有同名的进程[Quote=引用 4 楼 ccrun 的回复:]
zzb的代码存在逻辑漏洞，不同目录下的同名EXE会有误判。
[/Quote]

[ccrun.com]

我仔细看楼主的需求，好像并没有提到要判断同名进程，他要的是同一实例不超过两个。

我自己写一段代码来帮楼主完成需求，还是老三招之互斥。

以下代码放在主程序.cpp中：

HANDLE __stdcall CrnGetValidMutex()
{
    HANDLE hMutex1 = ::CreateMutex(NULL, TRUE, TEXT("CrnTestAppInstance1"));

    if (::GetLastError() == ERROR_ALREADY_EXISTS)
    {
        if (hMutex1)
            ::CloseHandle(hMutex1);

        HANDLE hMutex2 = ::CreateMutex(NULL, TRUE, TEXT("CrnTestAppInstance2"));

        if (::GetLastError() == ERROR_ALREADY_EXISTS)
        {
            if (hMutex2)
                ::CloseHandle(hMutex2);

            return NULL;
        }
        else
            return hMutex2;
    }
    else
        return hMutex1;
}

WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
    HANDLE hMutex = NULL;
    try
    {
         hMutex = CrnGetValidMutex();
         if (!hMutex)
         {
            ::MessageBox(NULL, TEXT("已经有两个实例运行了!"),
                    TEXT("提醒"), MB_OK | MB_ICONWARNING);

              return -1;
         }

         Application->Initialize();
         Application->CreateForm(__classid(TForm1), &Form1);
         Application->Run();
    }
    catch (Exception &exception)
    {
         Application->ShowException(&exception);
    }
    catch (...)
    {
         try
         {
             throw Exception("");
         }
         catch (Exception &exception)
         {
             Application->ShowException(&exception);
         }
    }

    ::ReleaseMutex(hMutex);
    ::CloseHandle(hMutex);

    return 0;
}

[wangcftxz]

给楼主顶起

楼主结贴率神马意思？

[zzbinfo]

HINSTANCE g_hinst;
#include <tlhelp32.h>
bool FindApp(AnsiString AppName)
{
HANDLE hSnap=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    PROCESSENTRY32 pe;
    int AppCount = 0;
    pe.dwSize = sizeof(pe);
    BOOL bNext=Process32First(hSnap, &pe);
    while(bNext)
    {
     if(strcmp(pe.szExeFile,AppName.c_str())==0)
     {
     //strcpy(szBuffer, pe.szExeFile);
     //break;
     //CloseHandle(hSnap);
     //return true;
     AppCount++;
     }
     bNext=Process32Next(hSnap, &pe);
    }
    CloseHandle(hSnap);
    if(AppCount > 2)//关键就是这里控制同名的进程数
      return true;
        else
        return false;
}
//---------------------------------------------------------------------------
WINAPI WinMain(HINSTANCE, HINSTANCE hInstance, LPSTR, int)
{
        try
        {
       
                if(FindApp(ExtractFileName(Application->ExeName)))//这里调用判断
                   return 0;
                
                 Application->Initialize();
                 g_hinst = hInstance;
                 Application->Title = "解包服务控制台";
                 Application->CreateForm(__classid(TForm1), &Form1);
                 Application->Run();
            
        }
        catch (Exception &exception)
        {
                 Application->ShowException(&exception);
        }
        catch (...)
        {
                 try
                 {
                         throw Exception("");
                 }
                 catch (Exception &exception)
                 {
                         Application->ShowException(&exception);
                 }
        }
        return 0;
}

只能这样了

[fxworld]

用同步变量“信号量”就可以了。

[cczlp]

借季老大的代码改改:

class TSharedMem
{
private:
	bool FCreated;
	BYTE * FFileView;
	HANDLE FHandle;
	DWORD FSize;

public:
	TSharedMem(const char * Name, DWORD 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);
			}
			FSize = Size;
		}
		else
		{
			FFileView = NULL;
			FSize = 0;
		}
	}

	~TSharedMem()
	{
		if (FFileView)
		{
			UnmapViewOfFile(FFileView);
		}
		if (FHandle)
		{
			CloseHandle(FHandle);
		}

	}

	__property BYTE * Buffer =
	{
		read = FFileView
	};
	__property bool Created =
	{
		read = FCreated
	};
	__property DWORD Size =
	{
		read = FSize
	};
};

WINAPI _tWinMain(HINSTANCE, HINSTANCE, LPTSTR, int)
{
	try
	{
		TSharedMem ShareMem("MyAPP", 8);
		if (ShareMem.Buffer[0]++ >= 2) return 0;
		Application->Initialize();
		Application->MainFormOnTaskBar = true;
		Application->CreateForm(__classid(TfrmMain), &frmMain);
		Application->Run();
	}
	catch (Exception &exception)
	{
		Application->ShowException(&exception);
	}
	catch (...)
	{
		try
		{
			throw Exception("");
		}
		catch (Exception &exception)
		{
			Application->ShowException(&exception);
		}
	}
	return 0;
}

[cczlp]

程序关闭前,应该使计数减1
if (ShareMem.Buffer[0]++ >= 2) {ShareMem.Buffer[0]--;return 0;}
后面return 0;前也要加ShareMem.Buffer[0]--;

[laowang2]

[ccrun.com]