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api.c
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api.c
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#include <ruby.h>
#include <windows.h>
// Ruby 1.9.x
#ifndef RSTRING_PTR
#define RSTRING_PTR(s) (RSTRING(s)->ptr)
#endif
#ifndef RSTRING_LEN
#define RSTRING_LEN(s) (RSTRING(s)->len)
#endif
#ifndef RARRAY_PTR
#define RARRAY_PTR(a) (RARRAY(a)->ptr)
#endif
#ifndef RARRAY_LEN
#define RARRAY_LEN(a) (RARRAY(a)->len)
#endif
/* Use Ruby defined macro definitions. */
#if !defined(NUM2SIZET) && !defined(NUM2SSIZET)
# if defined(HAVE_LONG_LONG) && SIZEOF_SIZE_T > SIZEOF_LONG
# define NUM2SIZET(x) ((size_t)NUM2ULL(x))
# define NUM2SSIZET(x) ((ssize_t)NUM2LL(x))
# else
# define NUM2SIZET(x) NUM2ULONG(x)
# define NUM2SSIZET(x) NUM2LONG(x)
# endif
#endif
/* Use Ruby defined macro definitions. */
#if !defined(SIZET2NUM) && !defined(SSIZET2NUM)
# if SIZEOF_SIZE_T > SIZEOF_LONG && defined(HAVE_LONG_LONG)
# define SIZET2NUM(v) ULL2NUM(v)
# define SSIZET2NUM(v) LL2NUM(v)
# elif SIZEOF_SIZE_T == SIZEOF_LONG
# define SIZET2NUM(v) ULONG2NUM(v)
# define SSIZET2NUM(v) LONG2NUM(v)
# else
# define SIZET2NUM(v) UINT2NUM(v)
# define SSIZET2NUM(v) INT2NUM(v)
# endif
#endif
#define MAX_BUF 1024
#define WINDOWS_API_VERSION "1.10.1"
#define _T_VOID 0
#define _T_LONG 1
#define _T_POINTER 2
#define _T_INTEGER 3
#define _T_CALLBACK 4
#define _T_STRING 5
VALUE cAPIError, cAPIProtoError, cAPILoadError;
static VALUE ActiveCallback = Qnil;
typedef struct {
HANDLE library;
FARPROC function;
int return_type;
int prototype[20];
} Win32API;
typedef struct ThreadData {
DWORD win32api_error;
} ThreadData;
static inline ThreadData* thread_data_get(void);
static ID id_thread_data;
static ThreadData* thread_data_init(void)
{
ThreadData* td;
VALUE obj;
obj = Data_Make_Struct(rb_cObject, ThreadData, NULL, -1, td);
td->win32api_error = 0;
rb_thread_local_aset(rb_thread_current(), id_thread_data, obj);
return td;
}
static inline ThreadData* thread_data_get()
{
VALUE obj = rb_thread_local_aref(rb_thread_current(), id_thread_data);
if(obj != Qnil && TYPE(obj) == T_DATA){
return (ThreadData*) DATA_PTR(obj);
}
return thread_data_init();
}
static void api_free(Win32API* ptr){
if(ptr->library)
FreeLibrary(ptr->library);
if(ptr)
free(ptr);
}
static VALUE api_allocate(VALUE klass){
Win32API* ptr = malloc(sizeof(Win32API));
memset(ptr, 0, sizeof(*ptr));
return Data_Wrap_Struct(klass, 0, api_free, ptr);
}
/* Helper function that converts the error number returned by GetLastError()
* into a human readable string. Note that we always use English for error
* output because that's what Ruby itself does.
*
* Internal use only.
*/
char* StringError(DWORD dwError){
LPVOID lpMsgBuf;
static char buf[MAX_PATH];
DWORD dwLen, dwLastError;
// Assume ASCII (English) error messages from the Windows API
dwLen = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(LPSTR)&lpMsgBuf,
0,
NULL
);
dwLastError = GetLastError();
/* It appears that Windows doesn't necessarily ship with the DLL
* required to always use English error messages. Check for error
* ERROR_MUI_FILE_NOT_FOUND (15100) or ERROR_RESOURCE_LANG_NOT_FOUND (1815)
* and try again if necessary.
*/
if(!dwLen && (dwLastError == 15100 || dwLastError == 1815)){
dwLen = FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
0,
(LPSTR)&lpMsgBuf,
0,
NULL
);
}
if(!dwLen){
rb_raise(
cAPIError,
"Attempt to format message failed (error = '%lu')",
GetLastError()
);
}
memset(buf, 0, MAX_PATH);
// Remove \r\n at end of string.
#ifdef HAVE_STRNCPY_S
strncpy_s(buf, MAX_PATH, lpMsgBuf, dwLen - 2);
#else
strncpy(buf, lpMsgBuf, dwLen - 2);
#endif
LocalFree(lpMsgBuf);
return buf;
}
/*
* call-seq:
* Win32::API::Callback.new(prototype, return='L'){ |proto| ... }
*
* Creates and returns a new Win32::API::Callback object. The prototype
* arguments are yielded back to the block in the same order they were
* declared.
*
* The +prototype+ is the function prototype for the callback function. This
* is a string. The possible valid characters are 'I' (integer), 'L' (long),
* 'V' (void), 'P' (pointer) or 'S' (string). Unlike API objects, API::Callback
* objects do not have a default prototype.
*
* The +return+ argument is the return type for the callback function. The
* valid characters are the same as for the +prototype+. The default is
* 'L' (long).
*
* Example:
* require 'win32/api'
* include Win32
*
* EnumWindows = API.new('EnumWindows', 'KP', 'L', 'user32')
* GetWindowText = API.new('GetWindowText', 'LPI', 'I', 'user32')
*
* EnumWindowsProc = API::Callback.new('LP', 'I'){ |handle, param|
* buf = "\0" * 200
* GetWindowText.call(handle, buf, 200);
* puts buf.strip unless buf.strip.empty?
* buf.index(param).nil? ? true : false
* }
*
* EnumWindows.call(EnumWindowsProc, 'UEDIT32')
*/
static VALUE callback_init(int argc, VALUE* argv, VALUE self)
{
void *find_callback(VALUE,int);
VALUE v_proto, v_return, v_proc;
int i;
rb_scan_args(argc, argv, "11&", &v_proto, &v_return, &v_proc);
/* Validate prototype characters */
for(i = 0; i < RSTRING_LEN(v_proto); i++){
switch(RSTRING_PTR(v_proto)[i]){
case 'I': case 'L': case 'P': case 'V': case 'S':
break;
default:
rb_raise(cAPIProtoError, "Illegal prototype '%c'",
RSTRING_PTR(v_proto)[i]
);
}
}
if(NIL_P(v_return) || RARRAY_LEN(v_return) == 0){
v_return = rb_str_new2("L");
}
else{
switch(*(TCHAR*)RSTRING_PTR(v_return)){
case 'I': case 'L': case 'P': case 'V': case 'S':
break;
default:
rb_raise(cAPIProtoError, "Illegal return type '%s'",
RSTRING_PTR(v_return)
);
}
}
rb_iv_set(self, "@function", v_proc);
rb_iv_set(self, "@prototype", v_proto);
rb_iv_set(self, "@return_type", v_return);
rb_iv_set(self, "@address", SIZET2NUM((LPARAM)find_callback(self,RSTRING_LEN(v_proto))));
ActiveCallback = self;
return self;
}
/*
* call-seq:
* Win32::API.new(function, prototype='V', return='L', dll='kernel32')
*
* Creates and returns a new Win32::API object. The +function+ is the name
* of the Windows function.
*
* The +prototype+ is the function prototype for +function+. This can be a
* string or an array of characters. The possible valid characters are 'I'
* (integer), 'L' (long), 'V' (void), 'P' (pointer), 'K' (callback) or 'S'
* (string).
*
* The default is void ('V').
*
* Constant (const char*) strings should use 'S'. Pass by reference string
* buffers should use 'P'. The former is faster, but cannot be modified.
*
* The +return+ argument is the return type for the function. The valid
* characters are the same as for the +prototype+. The default is 'L' (long).
*
* The +dll+ is the name of the DLL file that the function is exported from.
* The default is 'kernel32'.
*
* If the function cannot be found then an API::Error is raised (a subclass
* of RuntimeError).
*
* Example:
*
* require 'win32/api'
* include Win32
*
* buf = 0.chr * 260
* len = [buf.length].pack('L')
*
* GetUserName = API.new('GetUserName', 'PP', 'I', 'advapi32')
* GetUserName.call(buf, len)
*
* puts buf.strip
*/
static VALUE api_init(int argc, VALUE* argv, VALUE self)
{
HMODULE hLibrary;
FARPROC fProc;
Win32API* ptr;
int i;
const char* first = "A";
const char* second = "W";
VALUE v_proc, v_proto, v_return, v_dll;
rb_scan_args(argc, argv, "13", &v_proc, &v_proto, &v_return, &v_dll);
Data_Get_Struct(self, Win32API, ptr);
// Convert a string prototype to an array of characters
if(rb_respond_to(v_proto, rb_intern("split")))
v_proto = rb_str_split(v_proto, "");
// Convert a nil or empty prototype to 'V' (void) automatically
if(NIL_P(v_proto) || RARRAY_LEN(v_proto) == 0){
v_proto = rb_ary_new();
rb_ary_push(v_proto, rb_str_new2("V"));
}
// Set an arbitrary limit of 20 parameters
if(RARRAY_LEN(v_proto) > 20)
rb_raise(rb_eArgError, "too many parameters: %ld", RARRAY_LEN(v_proto));
// Set the default dll to 'kernel32'
if(NIL_P(v_dll))
v_dll = rb_str_new2("kernel32");
// Set the default return type to 'L' (DWORD)
if(NIL_P(v_return))
v_return = rb_str_new2("L");
#if defined TAINTING_SUPPORT
SafeStringValue(v_dll);
SafeStringValue(v_proc);
#endif
hLibrary = LoadLibrary(TEXT(RSTRING_PTR(v_dll)));
// The most likely cause of failure is a bad DLL load path
if(!hLibrary){
rb_raise(cAPILoadError, "LoadLibrary() function failed for '%s': %s",
RSTRING_PTR(v_dll),
StringError(GetLastError())
);
}
ptr->library = hLibrary;
/* Attempt to get the function. If it fails, try again with an 'A'
* appended. If that fails, try again with a 'W' appended. If that
* still fails, raise an API::LoadLibraryError.
*/
fProc = GetProcAddress(hLibrary, TEXT(RSTRING_PTR(v_proc)));
// Skip the ANSI and Wide function checks for MSVCRT functions.
if(!fProc){
if(strstr(RSTRING_PTR(v_dll), "msvcr")){
rb_raise(
cAPILoadError,
"Unable to load function '%s'",
RSTRING_PTR(v_proc)
);
}
else{
VALUE v_ascii = rb_str_new3(v_proc);
v_ascii = rb_str_cat(v_ascii, first, 1);
fProc = GetProcAddress(hLibrary, TEXT(RSTRING_PTR(v_ascii)));
if(!fProc){
VALUE v_unicode = rb_str_new3(v_proc);
v_unicode = rb_str_cat(v_unicode, second, 1);
fProc = GetProcAddress(hLibrary, TEXT(RSTRING_PTR(v_unicode)));
if(!fProc){
rb_raise(
cAPILoadError,
"Unable to load function '%s', '%s', or '%s'",
RSTRING_PTR(v_proc),
RSTRING_PTR(v_ascii),
RSTRING_PTR(v_unicode)
);
}
else{
rb_iv_set(self, "@effective_function_name", v_unicode);
}
}
else{
rb_iv_set(self, "@effective_function_name", v_ascii);
}
}
}
else{
rb_iv_set(self, "@effective_function_name", v_proc);
}
ptr->function = fProc;
// Push the numeric prototypes onto our int array for later use.
for(i = 0; i < RARRAY_LEN(v_proto); i++){
#if defined TAINTING_SUPPORT
SafeStringValue(RARRAY_PTR(v_proto)[i]);
#endif
switch(*(TCHAR*)StringValuePtr(RARRAY_PTR(v_proto)[i])){
case 'L':
ptr->prototype[i] = _T_LONG;
break;
case 'P':
ptr->prototype[i] = _T_POINTER;
break;
case 'I': case 'B':
ptr->prototype[i] = _T_INTEGER;
break;
case 'V':
ptr->prototype[i] = _T_VOID;
break;
case 'K':
ptr->prototype[i] = _T_CALLBACK;
break;
case 'S':
ptr->prototype[i] = _T_STRING;
break;
default:
rb_raise(cAPIProtoError, "Illegal prototype '%s'",
StringValuePtr(RARRAY_PTR(v_proto)[i])
);
}
}
// Store the return type for later use.
// Automatically convert empty strings or nil to type void.
if(NIL_P(v_return) || RSTRING_LEN(v_return) == 0){
v_return = rb_str_new2("V");
ptr->return_type = _T_VOID;
}
else{
#if defined TAINTING_SUPPORT
SafeStringValue(v_return);
#endif
switch(*RSTRING_PTR(v_return)){
case 'L':
ptr->return_type = _T_LONG;
break;
case 'P':
ptr->return_type = _T_POINTER;
break;
case 'I': case 'B':
ptr->return_type = _T_INTEGER;
break;
case 'V':
ptr->return_type = _T_VOID;
break;
case 'S':
ptr->return_type = _T_STRING;
break;
default:
rb_raise(cAPIProtoError, "Illegal return type '%s'",
RSTRING_PTR(v_return)
);
}
}
rb_iv_set(self, "@dll_name", v_dll);
rb_iv_set(self, "@function_name", v_proc);
rb_iv_set(self, "@prototype", v_proto);
rb_iv_set(self, "@return_type", v_return);
return self;
}
/*
* call-seq:
*
* API::Function.new(address, prototype = 'V', return_type = 'L')
*
* Creates and returns an API::Function object. This object is similar to an
* API object, except that instead of a character function name you pass a
* function pointer address as the first argument, and there's no associated
* DLL file.
*
* Once you have your API::Function object you can then call it the same way
* you would an API object.
*
* Example:
*
* require 'win32/api'
* include Win32
*
* LoadLibrary = API.new('LoadLibrary', 'P', 'L')
* GetProcAddress = API.new('GetProcAddress', 'LP', 'L')
*
* # Play a system beep
* hlib = LoadLibrary.call('user32')
* addr = GetProcAddress.call(hlib, 'MessageBeep')
* func = Win32::API::Function.new(addr, 'L', 'L')
* func.call(0)
*/
static VALUE func_init(int argc, VALUE* argv, VALUE self){
Win32API* ptr;
int i;
VALUE v_address, v_proto, v_return;
rb_scan_args(argc, argv, "12", &v_address, &v_proto, &v_return);
Data_Get_Struct(self, Win32API, ptr);
// Convert a string prototype to an array of characters
if(rb_respond_to(v_proto, rb_intern("split")))
v_proto = rb_str_split(v_proto, "");
// Convert a nil or empty prototype to 'V' (void) automatically
if(NIL_P(v_proto) || RARRAY_LEN(v_proto) == 0){
v_proto = rb_ary_new();
rb_ary_push(v_proto, rb_str_new2("V"));
}
// Set an arbitrary limit of 20 parameters
if(20 < RARRAY_LEN(v_proto))
rb_raise(rb_eArgError, "too many parameters: %li\n", RARRAY_LEN(v_proto));
// Set the default return type to 'L' (DWORD)
if(NIL_P(v_return))
v_return = rb_str_new2("L");
ptr->function = (FARPROC)NUM2SIZET(v_address);
// Push the numeric prototypes onto our int array for later use.
for(i = 0; i < RARRAY_LEN(v_proto); i++){
#if defined TAINTING_SUPPORT
SafeStringValue(RARRAY_PTR(v_proto)[i]);
#endif
switch(*(char*)StringValuePtr(RARRAY_PTR(v_proto)[i])){
case 'L':
ptr->prototype[i] = _T_LONG;
break;
case 'P':
ptr->prototype[i] = _T_POINTER;
break;
case 'I': case 'B':
ptr->prototype[i] = _T_INTEGER;
break;
case 'V':
ptr->prototype[i] = _T_VOID;
break;
case 'K':
ptr->prototype[i] = _T_CALLBACK;
break;
case 'S':
ptr->prototype[i] = _T_STRING;
break;
default:
rb_raise(cAPIProtoError, "Illegal prototype '%s'",
StringValuePtr(RARRAY_PTR(v_proto)[i])
);
}
}
// Store the return type for later use.
// Automatically convert empty strings or nil to type void.
if(NIL_P(v_return) || RSTRING_LEN(v_return) == 0){
v_return = rb_str_new2("V");
ptr->return_type = _T_VOID;
}
else{
#if defined TAINTING_SUPPORT
SafeStringValue(v_return);
#endif
switch(*RSTRING_PTR(v_return)){
case 'L':
ptr->return_type = _T_LONG;
break;
case 'P':
ptr->return_type = _T_POINTER;
break;
case 'I': case 'B':
ptr->return_type = _T_INTEGER;
break;
case 'V':
ptr->return_type = _T_VOID;
break;
case 'S':
ptr->return_type = _T_STRING;
break;
default:
rb_raise(cAPIProtoError, "Illegal return type '%s'",
RSTRING_PTR(v_return)
);
}
}
rb_iv_set(self, "@address", v_address);
rb_iv_set(self, "@prototype", v_proto);
rb_iv_set(self, "@return_type", v_return);
return self;
}
typedef struct {
uintptr_t params[20];
} CALLPARAM;
DWORD CallbackFunction(CALLPARAM param, VALUE callback)
{
VALUE v_proto, v_return, v_proc, v_retval;
VALUE argv[20];
int i, argc;
char *a_proto;
char *a_return;
if(callback && !NIL_P(callback)){
v_proto = rb_iv_get(callback, "@prototype");
a_proto = RSTRING_PTR(v_proto);
v_return = rb_iv_get(callback, "@return_type");
a_return = RSTRING_PTR(v_return);
v_proc = rb_iv_get(callback, "@function");
argc = RSTRING_LEN(v_proto);
for(i=0; i < RSTRING_LEN(v_proto); i++){
argv[i] = Qnil;
switch(a_proto[i]){
case 'L':
argv[i] = SIZET2NUM(param.params[i]);
break;
case 'P':
if(param.params[i])
argv[i] = rb_str_new2((char *)param.params[i]);
break;
case 'I':
argv[i] = INT2NUM(param.params[i]);
break;
default:
rb_raise(cAPIProtoError, "Illegal prototype '%c'", a_proto[i]);
}
}
v_retval = rb_funcall2(v_proc, rb_intern("call"), argc, argv);
/* Handle true and false explicitly, as some CALLBACK functions
* require TRUE or FALSE to break out of loops, etc.
*/
if(v_retval == Qtrue)
return TRUE;
else if(v_retval == Qfalse)
return FALSE;
switch (*a_return) {
case 'I':
return NUM2INT(v_retval);
break;
case 'L':
return NUM2SIZET(v_retval);
break;
case 'S':
return (uintptr_t)RSTRING_PTR(v_retval);
break;
case 'P':
if(NIL_P(v_retval)){
return 0;
}
else if(FIXNUM_P(v_retval)){
return NUM2SIZET(v_retval);
}
else{
StringValue(v_retval);
rb_str_modify(v_retval);
return (uintptr_t)StringValuePtr(v_retval);
}
break;
}
}
return 0;
}
#define CALLBACK0(x) DWORD CALLBACK CallbackFunction0_##x() {\
CALLPARAM param = {{0}};\
param.params[0] = 0;\
return CallbackFunction(param,FuncTable[0][x]);\
}
#define CALLBACK1(x) DWORD CALLBACK CallbackFunction1_##x(DWORD p1) {\
CALLPARAM param = {{p1}};\
return CallbackFunction(param,FuncTable[1][x]);\
}
#define CALLBACK2(x) DWORD CALLBACK CallbackFunction2_##x(\
DWORD p1, DWORD p2){\
CALLPARAM param = {{p1,p2}};\
return CallbackFunction(param,FuncTable[2][x]);\
}
#define CALLBACK3(x) DWORD CALLBACK CallbackFunction3_##x(\
DWORD p1, DWORD p2, DWORD p3){\
CALLPARAM param = {{p1,p2,p3}};\
return CallbackFunction(param,FuncTable[3][x]);\
}
#define CALLBACK4(x) DWORD CALLBACK CallbackFunction4_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4){\
CALLPARAM param = {{p1,p2,p3,p4}};\
return CallbackFunction(param,FuncTable[4][x]);\
}
#define CALLBACK5(x) DWORD CALLBACK CallbackFunction5_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4, DWORD p5\
){\
CALLPARAM param = {{p1,p2,p3,p4,p5}};\
return CallbackFunction(param,FuncTable[5][x]);\
}
#define CALLBACK6(x) DWORD CALLBACK CallbackFunction6_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4, DWORD p5, DWORD p6\
){\
CALLPARAM param = {{p1,p2,p3,p4,p5,p6}};\
return CallbackFunction(param,FuncTable[6][x]);\
}
#define CALLBACK7(x) DWORD CALLBACK CallbackFunction7_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4, DWORD p5, DWORD p6, DWORD p7\
){\
CALLPARAM param = {{p1,p2,p3,p4,p5,p6,p7}};\
return CallbackFunction(param,FuncTable[7][x]);\
}
#define CALLBACK8(x) DWORD CALLBACK CallbackFunction8_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4,\
DWORD p5, DWORD p6, DWORD p7, DWORD p8\
){\
CALLPARAM param = {{p1,p2,p3,p4,p5,p6,p7,p8}};\
return CallbackFunction(param,FuncTable[8][x]);\
}
#define CALLBACK9(x) DWORD CALLBACK CallbackFunction9_##x(\
DWORD p1, DWORD p2, DWORD p3, DWORD p4, DWORD p5,\
DWORD p6, DWORD p7, DWORD p8, DWORD p9\
){\
CALLPARAM param = {{p1,p2,p3,p4,p5,p6,p7,p8,p9}};\
return CallbackFunction(param,FuncTable[9][x]);\
}
#define DEFCALLBACK(x) CALLBACK##x(0)\
CALLBACK##x(1)\
CALLBACK##x(2)\
CALLBACK##x(3)\
CALLBACK##x(4)\
CALLBACK##x(5)\
CALLBACK##x(6)\
CALLBACK##x(7)\
CALLBACK##x(8)\
CALLBACK##x(9)
#define CF(x,y) CallbackFunction##x##_##y
static VALUE FuncTable[10][10];
DEFCALLBACK(0)
DEFCALLBACK(1)
DEFCALLBACK(2)
DEFCALLBACK(3)
DEFCALLBACK(4)
DEFCALLBACK(5)
DEFCALLBACK(6)
DEFCALLBACK(7)
DEFCALLBACK(8)
DEFCALLBACK(9)
void *CallbackTable[10][10] = {
{CF(0,0),CF(0,1),CF(0,2),CF(0,3),CF(0,4),CF(0,5),CF(0,6),CF(0,7),CF(0,8),CF(0,9)},
{CF(1,0),CF(1,1),CF(1,2),CF(1,3),CF(1,4),CF(1,5),CF(1,6),CF(1,7),CF(1,8),CF(1,9)},
{CF(2,0),CF(2,1),CF(2,2),CF(2,3),CF(2,4),CF(2,5),CF(2,6),CF(2,7),CF(2,8),CF(2,9)},
{CF(3,0),CF(3,1),CF(3,2),CF(3,3),CF(3,4),CF(3,5),CF(3,6),CF(3,7),CF(3,8),CF(3,9)},
{CF(4,0),CF(4,1),CF(4,2),CF(4,3),CF(4,4),CF(4,5),CF(4,6),CF(4,7),CF(4,8),CF(4,9)},
{CF(5,0),CF(5,1),CF(5,2),CF(5,3),CF(5,4),CF(5,5),CF(5,6),CF(5,7),CF(5,8),CF(5,9)},
{CF(6,0),CF(6,1),CF(6,2),CF(6,3),CF(6,4),CF(6,5),CF(6,6),CF(6,7),CF(6,8),CF(6,9)},
{CF(7,0),CF(7,1),CF(7,2),CF(7,3),CF(7,4),CF(7,5),CF(7,6),CF(7,7),CF(7,8),CF(7,9)},
{CF(8,0),CF(8,1),CF(8,2),CF(8,3),CF(8,4),CF(8,5),CF(8,6),CF(8,7),CF(8,8),CF(8,9)},
{CF(9,0),CF(9,1),CF(9,2),CF(9,3),CF(9,4),CF(9,5),CF(9,6),CF(9,7),CF(9,8),CF(9,9)}};
void *find_callback(VALUE obj,int len)
{
int i;
for(i=0;i<10;i++)
{
if(FuncTable[len][i]==0)
break;
}
if(i>=10)
rb_raise(cAPIError,"too many callbacks are defined.");
FuncTable[len][i] = obj;
return CallbackTable[len][i];
}
/*
* call-seq:
* Win32::API#call(arg1, arg2, ...)
*
* Calls the function pointer with the given arguments (if any). Note that,
* while this method will catch some prototype mismatches (raising a TypeError
* in the process), it is not fulproof. It is ultimately your job to make
* sure the arguments match the +prototype+ specified in the constructor.
*
* For convenience, nil is converted to NULL, true is converted to TRUE (1)
* and false is converted to FALSE (0).
*/
static VALUE api_call(int argc, VALUE* argv, VALUE self){
VALUE v_proto, v_args, v_arg, v_return;
Win32API* ptr;
uintptr_t return_value;
int i = 0;
int len;
ThreadData* thread_data = thread_data_get();
struct{
uintptr_t params[20];
} param;
Data_Get_Struct(self, Win32API, ptr);
rb_scan_args(argc, argv, "0*", &v_args);
v_proto = rb_iv_get(self, "@prototype");
// For void prototypes, allow either no args or an explicit nil
if(RARRAY_LEN(v_proto) != RARRAY_LEN(v_args)){
char* c = StringValuePtr(RARRAY_PTR(v_proto)[0]);
if(!strcmp(c, "V")){
rb_ary_push(v_args, Qnil);
}
else{
rb_raise(rb_eArgError,
"wrong number of parameters: expected %ld, got %ld",
RARRAY_LEN(v_proto), RARRAY_LEN(v_args)
);
}
}
len = RARRAY_LEN(v_proto);
for(i = 0; i < len; i++){
v_arg = RARRAY_PTR(v_args)[i];
// Convert nil to NULL. Otherwise convert as appropriate.
if(NIL_P(v_arg))
param.params[i] = (uintptr_t)NULL;
else if(v_arg == Qtrue)
param.params[i] = TRUE;
else if(v_arg == Qfalse)
param.params[i] = FALSE;
else
switch(ptr->prototype[i]){
case _T_LONG:
param.params[i] = NUM2SIZET(v_arg);
break;
case _T_INTEGER:
param.params[i] = NUM2INT(v_arg);
break;
case _T_POINTER:
if(FIXNUM_P(v_arg)){
param.params[i] = NUM2SIZET(v_arg);
}
else{
StringValue(v_arg);
rb_str_modify(v_arg);
param.params[i] = (uintptr_t)StringValuePtr(v_arg);
}
break;
case _T_CALLBACK:
ActiveCallback = v_arg;
param.params[i] = (LPARAM)NUM2SIZET(rb_iv_get(ActiveCallback, "@address"));;
break;
case _T_STRING:
param.params[i] = (uintptr_t)RSTRING_PTR(v_arg);
break;
default:
param.params[i] = NUM2SIZET(v_arg);
}
}
/* Call the function, get the return value */
if(strcmp(StringValuePtr(RARRAY_PTR(v_proto)[0]), "V") == 0 && len == 1)
{
return_value = ptr->function();
}
else
{
switch(len)
{
case 0:
return_value = ptr->function();
break;
case 1:
return_value = ptr->function(param.params[0]);
break;
case 2:
return_value = ptr->function(param.params[0], param.params[1]);
break;
case 3:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2]);
break;
case 4:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3]);
break;
case 5:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4]);
break;
case 6:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5]);
break;
case 7:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6]);
break;
case 8:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7]);
break;
case 9:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8]);
break;
case 10:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9]);
break;
case 11:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10]);
break;
case 12:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11]);
break;
case 13:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12]);
break;
case 14:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13]);
break;
case 15:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],
param.params[14]);
break;
case 16:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],
param.params[14], param.params[15]);
break;
case 17:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],
param.params[14], param.params[15], param.params[16]);
break;
case 18:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],
param.params[14], param.params[15], param.params[16], param.params[17]);
break;
case 19:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],
param.params[14], param.params[15], param.params[16], param.params[17],
param.params[18]);
break;
case 20:
return_value = ptr->function(param.params[0], param.params[1],
param.params[2], param.params[3], param.params[4], param.params[5],
param.params[6], param.params[7], param.params[8], param.params[9],
param.params[10], param.params[11], param.params[12], param.params[13],