为 Linux 应用程序编写 DLL --清单（应用程序和 dll）
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- UID
- 1066743
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为 Linux 应用程序编写 DLL --清单（应用程序和 dll）
清单（应用程序和 dll）dlTest.c:1
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| /*************************************************************/
/* Test Linux Dynamic Function Loading */
/* */
/* void *dlopen(const char *filename, int flag) */
/* Opens dynamic library and return handle */
/* */
/* const char *dlerror(void) */
/* Returns string describing the last error. */
/* */
/* void *dlsym(void *handle, char *symbol) */
/* Return pointer to symbol's load point. */
/* If symbol is undefined, NULL is returned. */
/* */
/* int dlclose (void *handle) */
/* Close the dynamic library handle. */
/* */
/* */
/* */
/*************************************************************/
#include<stdio.h>
#include <stdlib.h>
/* */
/* 1-dll include file and variables */
/* */
#include <dlfcn.h>
void *FunctionLib; /* Handle to shared lib file */
int (*Function)(); /* Pointer to loaded routine */
const char *dlError; /* Pointer to error string */
main( argc, argv )
{
int rc; /* return codes */
char HelloMessage[] = "HeLlO WoRlD\n";
/* */
/* 2-print the original message */
/* */
printf(" dlTest 2-Original message \n");
printf("%s", HelloMessage);
/* */
/* 3-Open Dynamic Loadable Libary with absolute path */
/* */
FunctionLib = dlopen("/home/dlTest/UPPERCASE.so",RTLD_LAZY);
dlError = dlerror();
printf(" dlTest 3-Open Library with absolute path return-%s- \n", dlError);
if( dlError ) exit(1);
/* */
/* 4-Find the first loaded function */
/* */
Function = dlsym( FunctionLib, "printUPPERCASE");
dlError = dlerror();
printf(" dlTest 4-Find symbol printUPPERCASE return-%s- \n", dlError);
if( dlError ) exit(1);
/* */
/* 5-Execute the first loaded function */
/* */
rc = (*Function)( HelloMessage );
printf(" dlTest 5-printUPPERCASE return-%s- \n", dlError);
/* */
/* 6-Close the shared library handle */
/* Note: after the dlclose, "printUPPERCASE" is not loaded */
/* */
rc = dlclose(FunctionLib);
dlError = dlerror();
printf(" dlTest 6-Close handle return-%s-\n",dlError);
if( rc ) exit(1);
/* */
/* 7-Open Dynamic Loadable Libary using LD_LIBRARY path */
/* */
FunctionLib = dlopen("lowercase.so",RTLD_LAZY);
dlError = dlerror();
printf(" dlTest 7-Open Library with relative path return-%s- \n", dlError);
if( dlError ) exit(1);
/* */
/* 8-Find the second loaded function */
/* */
Function = dlsym( FunctionLib, "printLowercase");
dlError = dlerror();
printf(" dlTest 8-Find symbol printLowercase return-%s- \n", dlError);
if( dlError ) exit(1);
/* */
/* 8-execute the second loaded function */
/* */
rc = (*Function)( HelloMessage );
printf(" dlTest 9-printLowercase return-%s- \n", dlError);
/* */
/* 10-Close the shared library handle */
/* */
rc = dlclose(FunctionLib);
dlError = dlerror();
printf(" dlTest 10-Close handle return-%s-\n",dlError);
if( rc ) exit(1);
return(0);
}
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UPPERCASE.c:1
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| /************************************************/
/* Function to print input string as UPPER case. */
/* Returns 1. */
/*********************************************** */
int printUPPERCASE ( inLine )
char inLine[];
{
char UPstring[256];
char *inptr, *outptr;
inptr = inLine;
outptr = UPstring;
while ( *inptr != '\0' )
*outptr++ = toupper(*inptr++);
*outptr++ = '\0';
printf(UPstring);
return(1);
}
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lowercase.c1
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| /********************************************/
/* Function to print input string as lower case. */
/* Returns 2. */
/******************************************* */
int printLowercase( inLine )
char inLine[];
{
char lowstring[256];
char *inptr, *outptr;
inptr = inLine;
outptr = lowstring;
while ( *inptr != '' )
*outptr++ = tolower(*inptr++);
*outptr++ = '';
printf(lowstring);
return(2);
}
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