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Size: 1825
Comment: Changed spaces in example.
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← Revision 8 as of 2017-03-11 22:54:16 ⇥
Size: 1835
Comment: Fixed include and comments in example.
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| Deletions are marked like this. | Additions are marked like this. |
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| #include "SDL_loadso.h" | #include "SDL.h" |
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| // Variable declaration | /* Variable declaration */ |
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| // Dynamically load mylib.so | /* Dynamically load mylib.so */ |
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| // Load the exported function from mylib.so // The exported function has the following prototype // void myFancyFunction(int anInt); |
/* Load the exported function from mylib.so * The exported function has the following prototype * void myFancyFunction(int anInt); */ |
| Line 40: | Line 41: |
| // Call myFancyFunction with a random integer | /* Call myFancyFunction with a random integer */ |
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| // Error handling here | /* Error handling here */ |
SDL_LoadFunction
Use this function to look up the address of the named function in the shared object and return it.
Contents
Syntax
void* SDL_LoadFunction(void* handle,
const char* name)
Function Parameters
handle |
a valid shared object handle returned by SDL_LoadObject() |
name |
the name of the function to look up |
Return Value
Returns a pointer to the function or NULL if there was an error; call SDL_GetError() for more information.
Code Examples
#include "SDL.h"
/* Variable declaration */
void* myHandle = NULL;
char* myFunctionName = "myFancyFunction";
void (*myFancyFunction)(int anInt);
/* Dynamically load mylib.so */
myHandle = SDL_LoadObject("mylib.so");
/* Load the exported function from mylib.so
* The exported function has the following prototype
* void myFancyFunction(int anInt);
*/
myFancyFunction = (void (*)(int))SDL_LoadFunction(myHandle, myFunctionName);
/* Call myFancyFunction with a random integer */
if (myFancyFunction != NULL) {
myFancyFunction(15);
} else {
/* Error handling here */
}
Remarks
This function pointer is no longer valid after calling SDL_UnloadObject().
This function can only look up C function names. Other languages may have name mangling and intrinsic language support that varies from compiler to compiler.
Make sure you declare your function pointers with the same calling convention as the actual library function. Your code will crash mysteriously if you do not do this.
