头文件在Linux中的作用 在Linux系统中,头文件(Header files)是一种特殊类型的文件,用来在程序中包含一些预定义的函数原型、宏定义和结构体定义等信息。头文件通常具有扩展名为.h,它的作用是为了方便程序员在编写程序时进行函数的申明和宏的定义,以及引入必要的库函数。在Linux开发中,头文件极为重要,它们对于程序的...
OHOS::ImageHeader OHOS::ImageInfo OHOS::Interpolation OHOS::KeyEvent OHOS::Layout OHOS::Line OHOS::List< T > OHOS::ListNode< T > OHOS::ListScrollListener OHOS::LongPressEvent OHOS::Matrix3< T > OHOS::Media::Camera OHOS::Media::CameraAbility OHOS::Media::...
Minimum supported serverWindows 2000 Server [desktop apps only] Headerwinsock2.h (include Winsock2.h, Winsock.h) WSAAsyncSelect WSAEventSelect select Feedback Was this page helpful? YesNo Provide product feedback| Get help at Microsoft Q&A
If you want to monitor more than 256 file descriptors on a single tpf_select_bsd call, the application must define its own FD_SETSIZE before the include of header sys/time.h. The purpose of the FD functions is to set up the input for and check the output from a tpf_select_bsd call...
OS Versions: Windows CE .NET 4.0 and later. Header: Winsock2.h.See Alsoselect | WSAEventSelectSend Feedback on this topic to the authorsFeedback FAQs© 2006 Microsoft Corporation. All rights reserved.English (United States) Your Privacy Choices Theme Manage cookies Previous Versions Blog ...
Der folgende Header stellt auch den Typ fd_set bereit: <sys/time.h>. Ein fd_set ist ein Puffer fester Größe. Wird FD_CLR() oder FD_SET() mit einem Wert für fd, der negativ, gleich groß oder größer als FD_SETSIZE ist, ausgeführt, führt dies zu nicht definiert...
#ifndef MY_HEADER_FILE_H #define MY_HEADER_FILE_H // 头文件内容 #endif // MY_HEADER_FILE_H 对于标准库头文件,通常不需要这样做,因为标准库头文件已经包含了适当的保护符。5. 重新编译项目 原因:修改头文件包含顺序或添加预处理宏后,需要重新编译项目以确保更改生效。
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Header winsock2.h Windows Embedded CE Windows CE .NET 4.0 and laterSee AlsoReferenceWinsock Structures select WSAEventSelectEnglish (United States) Your Privacy Choices Theme Manage cookies Previous Versions Blog Contribute Privacy Terms of Use Trademarks © Microsoft 2025...
Thesys/select.hheader file provided a stock implementation offd_set: The stock implementation represented a a bit array ofFD_SETSIZEbits. You could configure the header file by defining theFD_SETSIZEpreprocessor symbol to the number of bits you desire, and if you didn’t customize the value...