c - GNU C 编程 : getting error (Segmentation fault (core dumped)) when calling another c dll function

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关闭。此题需要 details or clarity 。目前不接受答案。

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已关闭 9 年前。

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#include <stdio.h>;
#include <windows.h>;
#include <malloc.h>;
typedef int (__cdecl *MYPROC)( void *epcs, char *message, char *sign,unsigned int *sig_len );
main();
{  
  HINSTANCE hh;  
  MYPROC hhLib;  
  void *j;  
  int *x = (int*)malloc(8);  
  unsigned int *y = (unsigned int*)malloc(8);  
  int *z = (int*)malloc(8);  
  char *msg, *sign ;  
  msg = (char*)malloc(512*sizeof(char));  
  sign = (char*)malloc(512*sizeof(char));  
  *x = 2541;  
  *y = 10;  
  *z = 0;  
  j = (int*)*x;  
  msg = "Test of MSG";  
  sign = "Test of Sign";  
  hh = LoadLibrary("epcs.dll");  
  if (hh == NULL)   {    
    printf("Unable to load epcs shared library\n");    
    return 0;  
  }  
  hhLib = (MYPROC)GetProcAddress(hh, "epcs_test");  
  if (hhLib==NULL)   {     
    printf("Unable to point shared library function (epcs_test).. \n");     
    return 0;  
  }  
  z = hhLib(j, msg, sign, y);  
  printf("%d \n",*x);  
  printf("%d \n",j);  
  printf("%d \n",*y); 
  printf("%d \n",*z);
  printf("%s \n",msg);
  printf("%s \n",sign);
  return 0;
}

Answer 1

问题之一在于:

msg = (char*)malloc(512*sizeof(char));  
sign = (char*)malloc(512*sizeof(char));  
...
msg = "Test of MSG";  
sign = "Test of Sign";