C程序不会在Visual Studio 2010编译 [英] C Program Won't Compile in Visual Studio 2010

问题描述

我有一个简单的C程序，我可以通过命令行编译Linux上很容易的，但是，要使用Visual Studio调试程序，这样我可以更容易地看到它在做什么，但我不能得到它的编译。

I have a simple C program that I can compile via command line on Linux easily enough but want to use Visual Studio to debug the program so that I can more easily see what it's doing but I cannot get it to compile.

我创建了一个新的cpp Win32控制台应用程序。加了我的.c和.h文件，但我不能让它编译。我得到100+的错误，主要似乎是熏鲱鱼。比如我有一个错误说一个变量没有声明时，我可以看到它之前立即就行了声明。例如：

I have created a new cpp Win32 console application. Added my .c and .h file but I cannot get it to compile. I get 100+ errors that primarily seem to be red herrings. For instance I have an error saying a variable isn't declared when I can see it declared on the line immediately before. For instance:

int i;
for (i = 0; i < unpacked_length; i++)
{

在为行，我得到一个错误：错误C2065：'我'：未声明的标识符

on the "for" line I get an error: "error C2065: 'i' : undeclared identifier"

那么别的东西显然是怎么回事。这似乎合法的一个错误是这个：

So something else is obviously going on. One error that seems legit is this one:

static unsigned char* Base64_Charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

智能感知：类型的值为const char *不能用于初始化类型的实体无符号的字符*

IntelliSense: a value of type "const char *" cannot be used to initialize an entity of type "unsigned char *"

由于该工程通过命令行编译时，我不知道为什么智能感知会在这里给这个错误，除非这个编译器有比我通过命令行中使用的另一种不同的规则。我没有做任何C约15年，不知道这可能是在编译器中的差或如果有别的事情在这里。

Since this works when compiling via command line I don't know why the intellisense would be giving this error here unless this compiler has different rules than the other one I used via command line. I haven't done any C for about 15 years and don't know if this could be a difference in compiler or if there is something else going on here.

的只包括在源是：

#include "dtcrypt.h"
#include <string.h>
#include <stdlib.h>

鸭preciate任何帮助！

Appreciate any help!

推荐答案

Visual Studio 2010中只支持ANSI C（又名C89），它不支持更现代的C99或C11语言标准。 ANSI C要求您声明所有的变量在函数的顶端，你不能在使用之前，他们一个函数的中间定义它们。因此，尝试重写你的code是这样的：

Visual Studio 2010 only supports ANSI C (aka C89), it does not support the more modern C99 or C11 language standards. ANSI C requires you to declare all of your variables at the top of a function, you cannot define them in the middle of a function just before they are used. So try rewriting your code like this:

void my_function()
{
    /* Variable declarations go here */
    int i;
    ...

    /* Now teh codez */
    for (i = 0; i < unpacked_length; i++)
    {
        ...
    }
}

对于第二个错误，智能感知抱怨它不能一个指针转换为为const char 的指针 const的无符号字符。字符串文字具有类型的char [] （字符数组）和字符默认情况下签署的。所以，你应该声明的变量类型为const char * 而不是 const的无符号字符* 。或者，你可以忽略它，因为它不是一个编译器错误，但它是在一定的警告级别警告。

For the second error, Intellisense complaining that it can't convert a pointer to const char to a pointer to const unsigned char. String literals have type char[] (array of characters), and char is signed by default. So, you should declare your variable as type const char * instead of const unsigned char *. Or, you can ignore it, since it's not a compiler error, but it is a warning at certain warning levels.

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