WinMain参数求助

[Cym_cd10x]

刚刚学WinMain，求hInstance即“当前实例句柄”到底是什么意思

[qybao]

说白了就是指针，指向当前实例

[赵4老师]

比如你执行同一个程序两次，两者的hInstance的值不一样，用来区分两者。 WinMain The WinMain function is called by the system as the initial entry point for a Win32-based application. int WINAPI WinMain( HINSTANCE hInstance, // handle to current instance HINSTANCE hPrevInstance, // handle to previous instance LPSTR lpCmdLine, // pointer to command line int nCmdShow // show state of window ); Parameters hInstance Handle to the current instance of the application. hPrevInstance Handle to the previous instance of the application. For a Win32-based application, this parameter is always NULL. If you need to detect whether another instance already exists, create a uniquely named mutex using theCreateMutex function. CreateMutex will succeed even if the mutex already exists, but theGetLastError function will return ERROR_ALREADY_EXISTS. This indicates that another instance of your application exists, because it created the mutex first. lpCmdLine Pointer to a null-terminated string specifying the command line for the application, excluding the program name. To retrieve the entire command line, use theGetCommandLine function. nCmdShow Specifies how the window is to be shown. This parameter can be one of the following values: Value Meaning SW_HIDE Hides the window and activates another window. SW_MINIMIZE Minimizes the specified window and activates the top-level window in the system's list. SW_RESTORE Activates and displays a window. If the window is minimized or maximized, the system restores it to its original size and position (same as SW_SHOWNORMAL). SW_SHOW Activates a window and displays it in its current size and position. SW_SHOWMAXIMIZED Activates a window and displays it as a maximized window. SW_SHOWMINIMIZED Activates a window and displays it as an icon. SW_SHOWMINNOACTIVE Displays a window as an icon. The active window remains active. SW_SHOWNA Displays a window in its current state. The active window remains active. SW_SHOWNOACTIVATE Displays a window in its most recent size and position. The active window remains active. SW_SHOWNORMAL Activates and displays a window. If the window is minimized or maximized, the system restores it to its original size and position (same as SW_RESTORE). Return Values If the function succeeds, terminating when it receives a WM_QUIT message, it should return the exit value contained in that message's wParam parameter. If the function terminates before entering the message loop, it should return zero. Remarks Your WinMain should initialize the application, display its main window, and enter a message retrieval-and-dispatch loop that is the top-level control structure for the remainder of the application's execution. Terminate the message loop when it receives a WM_QUIT message. At that point, your WinMain should exit the application, returning the value passed in the WM_QUIT message's wParam parameter. If WM_QUIT was received as a result of calling PostQuitMessage, the value of wParam is the value of the PostQuitMessage function's nExitCode parameter. For more information, see Creating a Message Loop. ANSI applications can use the lpCmdLine parameter of the WinMain function to access the command-line string, excluding the program name. The reason that WinMain cannot return Unicode strings is that lpCmdLine uses the LPSTR data type, not the LPTSTR data type. The GetCommandLine function can be used to access Unicode strings in the command line, because it uses the LPTSTR data type. Windows CE: Windows CE does not support the following values for the nCmdShow parameter: SW_MINIMIZE SW_RESTORE SW_SHOWMAXIMIZED SW_SHOWMINIMIZED SW_SHOWMINNOACTIVE QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in winbase.h. Import Library: User-defined. See Also Windows Overview, Window Functions,CreateMutex, DispatchMessage,GetCommandLine, GetMessage, PostQuitMessage, TranslateMessage

[ooolinux]

程序和进程的概念。

[突触]

如果你没有其它知识做铺垫的话这个理解起来比较困难，这里的hInstance 是程序被系统加载到内存空间的首地址。