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什么是L/C付款方式?

什么是L/C付款方式?

What is a 什么是L/C付款方式? wrapper DLL, and when do I need one?

I need to call an external DLL in LabVIEW, but the parameters of the function do not easily map to LabVIEW data types.

Solution

A wrapper is a piece of software that provides a compatibility layer to another piece of software. One is often necessary when developing LabVIEW applications because third-party DLLs are typically designed to be accessed from C (or similar low-level languages) and not LabVIEW. Such a DLL may, for example, return pointers or complex data structures which 什么是L/C付款方式? LabVIEW cannot easily handle.

Writing a wrapper DLL can be compared to writing a completely separate program in C that accesses the original DLL in the way the original author intended. In turn, this wrapper program has been specifically designed to be accessed from LabVIEW. In this sense, the new C program "wraps" around the original C program (DLL) and provides a layer of compatibility. The benefit of a wrapper is that 什么是L/C付款方式? the source code for the original DLL is not necessary, as it does not need to be modified in 什么是L/C付款方式? any way.

Additional Information

A common situation where a wrapper is needed is if a function in C or C++ has a union type as an input parameter or return value. This is because LabVIEW is incompatible with unions, due to strict typing rules that unions violate.
In this 什么是L/C付款方式? case a wrapper DLL would need to take a single value from LabVIEW and assign it to a union before passing it to the 什么是L/C付款方式? main DLL.

什么是GCC?

hunterzone 于 2014-09-23 16:33:46 发布 18217 收藏 58

Linux系统下的Gcc(GNU C Compiler)是GNU推出的功能强大、性能优越的多平台编译器,是GNU的代表作品之一。

二、Gcc是怎样生成可执行文件的

三、如何获取Gcc

四、实例

实验环境: windows + MinGW

GCC位置: [MinGW目录]/bin/,其中 cc1.exe 位于 [MinGW目录]/bin/libexec/gcc/mingw32/4.4.1/

一步到位:
gcc.exe hello.c
当前目录下直接生成 a.exe 执行后直接显示 hello world!

1、预处理: cpp.exe hello.c -o hello.i
如果你有兴趣可以用记事本直接打开hello.i 慢慢看

2、编译: [完整路径]\cc1.exe hello.i 什么是L/C付款方式?
如果你有兴趣可以用记事本查看生的成汇编源代码 hello.s

3、汇编: as.exe hello.s -o hello.o
生成目标文件 hello.o 如不设置默认为 a.out

4、连接: ld.exe hello.o
我这一步执行的时候失败了,按照网上资料所说是因为找不到main函数和printf函数入口。

gcc.exe hello.c -save-temps
过程中的hello.i、hello.s、hello.o、hello.exe都会被保留
但是具体命令使用的参数不得而知

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