在Visual Studio中编写C代码

Question

我在Visual Studio中编写了一个简单的函数,以便能够研究如何在Visual Studio中编写C项目,但它给出了以下错误:

Error   1   error C2275: 'FILE' : illegal use of this type as an expression        
c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c    25    
1   Exc4

Error   2   error C2065: 'file' : undeclared identifier   
c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c    25  
1   Exc4

  Error 3   error C2065: 'file' : undeclared identifier 
 c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c   31     1    
    Exc4
  Error 6   error C2065: 'file' : undeclared identifier 
   c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c 39  1   
   Exc4
    Error   9   error C2065: 'file' : undeclared identifier 
   c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c 41  1   
    Exc4

   Error    12  error C2065: 'file' : undeclared identifier 
    c:\users\henry\documents\visual studio 2010\projects\exc4\exc4\measurement.c    45  1   
   Exc4
17  IntelliSense: a value of type "void *" cannot be used to initialize an 
     entity of type "Tmeasurement *"    c:\users\henry\documents\visual studio 
      2010\projects\exc4\exc4\measurement.c 99  33  Exc4

当我在mac Xcode编译器上编译函数时,我从未遇到过这个错误.希望任何一个可以解释为什么语句FILE*文件没有被识别.

Tmeasurement readMeasurements(Tmeasurement a, char *filename)
{
    int filesize, i;
    struct stat st;
    stat(filename, &st);
    filesize = st.st_size;

    a.ArraySize = filesize;
    a.measureArray = (float*)malloc(filesize*sizeof(float));

    FILE *file = fopen(filename, "r+");
    // FILE *file = fopen(filename, "r");
    /*filesize = fread(a.measureArray, 1, filesize, file);
    a.ArraySize = filesize;*/

    if(file==NULL)
    {
        printf("Could not open mea.dat!\n");
        return; 
    }

    for(i=0;  i<102 &&(fgetc(file))!=EOF;i++)
    {
        fscanf(file,"%e",&a.measureArray[i]);
    }

    fclose(file);
    return a;
}

Answer 1

Visual Studio是一个C89编译器.

混合声明和代码是C99功能.

不要混合声明和代码或不使用Visual Studio :)