在VC中如何使一个程序只能运行一个实例？

[dzc]

[panda_w]

这个问题太老了，你搜索一下

[cinlan]

Findwindow

[liu_feng_fly]

用一个静态变量纪录App（应用程序）的个数，超过一个就返回就行了，具体看你怎么处理了

[fd]

创建一个命名信号量,

[fd]

创建一个命名信号量,然后 GetLastError 返回 表示"已经存在" 的那个值.表示已经有个实例
在运行,此时退出即可.
CreateSemaphore
GetLastError

[cornemuse]

这个问题已经有很多人问过

在APP的InitInstance中开头加入如下代码
HANDLE hMutex=::CreateMutex(NULL,TRUE,"FirstName");//FirstName可以随便取一个唯一的名字
if (hMutex!=NULL)
{
if (GetLastError()==ERROR_ALREADY_EXISTS)
{
AfxMessageBox("已经有一个程序运行");
return FALSE;
}
}
以下为该函数的其余部分,略去一部份
AfxEnableControlContainer();
// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

// Change the registry key under which our settings are stored.
// TODO: You should modify this string to be something appropriate
// such as the name of your company or organization.
SetRegistryKey(_T("Local AppWizard-Generated Applications"));

LoadStdProfileSettings(); // Load standard INI file options (including MRU)

// Register the application's document templates. Document templates
// serve as the connection between documents, frame windows and views.

CSingleDocTemplate* pDocTemplate;
pDocTemplate = new CSingleDocTemplate(
IDR_MAINFRAME,
RUNTIME_CLASS(CTestDoc),
RUNTIME_CLASS(CMainFrame), // main SDI frame window
RUNTIME_CLASS(CTestView));
AddDocTemplate(pDocTemplate);

// Parse command line for standard shell commands, DDE, file open
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);

// Dispatch commands specified on the command line
if (!ProcessShellCommand(cmdInfo))
return FALSE;
.........//略

[dzc]

谢了！兄第们!

[dzc]

谢了！兄弟们!

[bighead]

FindWindow
Mutex....

[hyqryq]

在<<thinking in C++>>中有.

[111222]

if(FindWindow(null,自己的窗口类))
退出;
else
初始化；

[dzc]

谢了！

[dzc]

谢了