libffi | 易学教程

Centos7安装python3.8.2 和pip3

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3 月，跳不动了？>>> 1.安装第三方库 yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make yum install libffi-devel -y 2.安装python3.8.2 #建立新目录 sudo mkdir /usr/local/python3 #下载3.8.2 wget --no-check-certificate https://www.python.org/ftp/python/3.8.2/Python-3.8.2.tgz #解压安装包，编译安装 tar xzvf Python-3.8.2.tgz cd Python-3.8.2 sudo ./conigure --prefix=/usr/local/python3 sudo make && sudo make install #创建软链接 sudo ln -s /usr/local/python3/bin/python3 /usr/bin/python3 #验证python安装 python3 -V 3.安装pip #通过get-pip.py安装 curl https://bootstrap.pypa.io/get-pip.py -o get-pip

Compiling libffi with VS2012 fails with fatal error LNK1281: Unable to generate SAFESEH image

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问题 Compiling libffi with VS11 gives the following linker error libffi\libffi-3.0.9\ms\Win32\Debug\ffi.dll : fatal error LNK1281: Unable to generate SAFESEH image. The same project was compiling fine with VS10, but after an auto upgrade with VS2012, it started giving linker error The Explanation in MSDN is too cryptic and least helpful I might rebuild with /SAFESEH:NO , but I am unsure of the implication. Please advise what might go wrong. 回答1: The main implication of not having SAFESEH is that

In C, given a variable list of arguments, how to build a function call using them?

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问题 Suppose there's a list of arguments stored somehow, in a array for example. Given a function pointer , how could I make a call to it passing the stored list of arguments? I'm not trying to pass the array as an argument ok. You got it, ok? I want to pass each of its elements as an argument. An array is just to illustrate, I could be storing the arguments in some tuple structure. Also, look that I have at hand a function pointer and may have a signature in string format . I'm not trying to just

Javascript String to C++ char pointer -LPSTR buffer in JSCTypes

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问题 I am accessing the DLL from JavaScript using JSCTypes. I have to receive data by passing a character buffer to the following API, __declspec(dllexport) WORD WINAPI receive( LPWORD lpwBufferSize, LPSTR lpsBuffer); My jsctypes looks like this, let receive = libs.dll.declare("receive", ctypes.stdcall_abi, ctypes.int32_t, // Return type - return code ctypes.int32_t.ptr, // buffer size ctypes.char.ptr, // Buffer ); var bufferSize = new ctypes.int32_t(3000000).address(); //3000000 var buffer = new

Error installing bcrypt with pip on OS X: can't find ffi.h (libffi is installed)

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问题 I'm getting this error when trying to install bcrypt with pip. I have libffi installed in a couple places (the Xcode OS X SDK, and from homebrew), but I don't know how to tell pip to look for it. Any suggestions? Downloading/unpacking bcrypt==1.0.2 (from -r requirements.txt (line 41)) Running setup.py egg_info for package bcrypt OS/X: confusion between 'cc' versus 'gcc' (see issue 123) will not use '__thread' in the C code c/_cffi_backend.c:14:10: fatal error: 'ffi.h' file not found #include

Template programming: specialization and enable_if

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问题 I'm working with libffi and I've made a class with a similar template to std::function (i.e class Func<Ret (Args...)> { /* ... */}; . I want to convert the return type ( Ret ) and each argument type ( Args ) to their corresponding libffi type (see this for reference). So far I've come up with this: // Member function of 'Func' class Prepare(void) { // This vector holds all the type structures std::vector<ffi_type*> argumentTypes{ GetFFIType<Args>()... }; ffi_type * returnType = GetFFIType<Ret

How do I compile libffi for iOS & macOS?

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问题 I'm trying to use libffi in one of my projects, but I can't seem to compile for iOS (or macOS, for that matter). Here is one of the various errors I've encountered while building for the iOS Simulator: bash: src/arm/gentramp.sh: No such file or directory Update 1: Since the question remains unanswered, I've decided to open an issue at the official repository as well. Update 2: Question has been answered and the issue has been closed! 回答1: generate-darwin-source-and-headers.py and the libffi

Passing structs by value with cffi-libffi?

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问题 I'm under the impression that CFFI cant pass structs by value, but the CFFI documentation says: To pass or return a structure by value to a function, load the cffi-libffi system and specify the structure as (:struct structure-name) . To pass or return the pointer, you can use either :pointer or (:pointer (:struct structure-name)) . I'm re-wrapping the cl-opencv function get-size , which is a wrapper for this opencv function: CvSize cvGetSize(const CvArr* arr) and since I don't think CFFI had

linux 出现类似常见问题ImportError: libxxx: 或 'GLIBCXX_3.4.21' not found 的解决方法

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常见类似问题： ImportError: libxxx: cannot open shared object file: No such file or directory 原因1 ：可能路径未配置正确解决方法：找到libxxx安装的目录，将目录添加到环境变量LD_LIBRARY_PATH [root@myserver ~]# find / -name libffi* /usr/local/lib64/libffi.so.6 /root/libffi-3.2.1/x86_64-unknown-linux-gnu/.libs/libffi.so.6 ... [root@myserver~]# echo $LD_LIBRARY_PATH [root@myserver~]# export LD_LIBRARY_PATH=”/usr/local/lib64/” 原因2 : 未安装该库，或版本过低解决方法：查看适配的版本 yum whatprovides libxxx [root@kefu1013 thoth-ai]# yum whatprovides libXrender.so.1 Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile * base: mirrors

Problems installing Common Lisp Sketch into Windows 10

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问题 I had trouble getting through errors for missing SDL DLL's and an FFI.H file while installing sketch with quicklisp. Posting my solution for this Windows 10 specific trouble, maybe there are other solutions too. I ended up using Chocolatey and Cmder for my mingw64 environment. 回答1: This is what I had to do in order to get through several errors for missing SDL DLL's and FFI.H header. 1. Install Cmder using Chocolatey: https://chocolatey.org/packages/Cmder 2. Download and copy all the SDL, SDL