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How to create a Android SO library dinamically loaded in yo
ur FMX projects? by Emailx45
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盒子上朋友Emailx45又发布了贴子，在FMX项目中如何建立并使用Android动态库？又是一篇实用的文章，转贴过
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Later very searches on internet and almost nothing found, I have solved the question.
First, let's remeber about that a library is, pratically, the same that an executable application. Of course, the speci
allists can define better than me.
The RAD Studio can create library in MSWindows, Linux and macOS platform systems. Just use the wizard do cr
eate it in your IDE:
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File ->
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Other
-> New 博客
:
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Dinamic Library (MSWindows, macOS)
页
Android Service (Android)
注
Here, we can note that there is not a Linux option, but Android is a not a Linux at end?
But this is not the point here.
The point is: What is the difference between a library to MSWindows and Posix systems?
Good point!!!
The point more significant is how the code is called and intepreted by CPU target.
Certainly this matter is beyond my knowledge, and therefore we will leave it to the engineers on duty.
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Returning内容精选
to my
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博客 world学堂
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humble
of knowledge,
above, RAD
Studio can
generate such LeaTech全球CTO领导力峰会
code t
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hat will be supported by the target CPU supported by RAD Studio, so there is no need to go into much depth at th
is point.
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关
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Let's pay attention to the following points that the programmer must obey:
create library file according to desired target CPU
test the code to check for possible design flaws
check the access permissions on the target disk (at least read and write in case of MSWindows, and in Posix, exe
cute permission if necessary)
deploy the library to the target operating system
in the client software, always ask the end user for their consent to access the disk, and later access the library fil
e for dynamic loading.
after executing the tasks proposed by the library, always end the call, that is, freeing the memory consumed by th
e library.
Thus, avoiding memory accumulation and possibly a memory leak when terminating the software.
As RAD Stuido is an advanced programming interface, many of the programmer's tasks are reduced to simple cli
cks and choices on the IDE's screen.
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This
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is fine,
however,博客
it makes学堂
the developer
lazy and careless.
Especially
if he is a开源基础软件社区
beginner or has aLeaTech全球CTO领导力峰会
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pplications in his domain.
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页the programmer
注
榜
栏 IDE you use.
We must not forget that
is you, not the
We must have it as a working tool, not as an excuse not to reason.
In a popular Brazilian saying, we say:
The rushed eat raw. (those in a hurry don't wait for the rice to be cooked as it should)
Now, on to the code!
Here I will demonstrate a way that will try to demystify the use of the RAD Studio IDE, and, by following, prove tha
t many codes found on the internet, and widely reproduced in many blogs, should not be or at least should be stu
died and used in other ways. shapes.
I will demonstrate that you can create a RAD Studio project file (*.DPR) manually (without using the RAD Studio I
DE). Naturally, some settings I'll do via IDE for the simple fact that RAD Studio creates many auxiliary files on dis
k, and creating them manually is really a karma that I don't want at this point.
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First I will create the DPR
which will be my library (OS) for Android 64bits.
首 file called
关 "mydprmanuallibrary.dpr",
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For that, I will use Notepad++ (generic file editor) to prove that is not necessary (at all) use the IDE from RAD Stu
dio do create it.
So, the contents of this file will be as follows:
1.
program mydprmanuallibrary;
2.
3.
{$R *.res}
4.
5.
// ---- this code will be added by RAD Studio IDE, ok?
6.
//
------- then, just ignore it for while....
7.
//
uses
8.
//
9.
//
because the auxiliar files used by RAD!
uUnitWithFunctions in 'uUnitWithFunctions.pas';
-----
10.
11.
begin
12.
end.
Pay attention in line with "program mydprmanuallibrary;" ... this is the real difference between a "Library MSWindo
ws" and a "Library to Posix".
--- MSWindows: library mydprmanuallibrary;
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--- Posix:内容精选
program
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mydprmanuallibrary;
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首 unit with
关my function
排行 in my library
订阅专
Now, I will go create my
1.
unit uUnitWithFunctions;
页
2.
3.
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interface
4.
5.
function IncrementThisValue(AValue: integer): integer; cdecl;
6.
7.
exports IncrementThisValue;
8.
9.
implementation
10.
11.
function IncrementThisValue(AValue: integer): integer;
12.
begin
13.
Inc(AValue);
14.
result := AValue;
15.
end;
16.
17.
end.
Now, our library SO Android is almost ready for use. Let's use the IDE to create all auxiliar files and configuration
s necessary for end it.
Auxiliar files to IDE development:
--- mydprmanuallibrary.identcache
--- mydprmanuallibrary.dproj.local
--- mydprmanuallibrary.dproj
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In your IDE RAD Studio,
file to complete
首 just open
关 the DPR
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you need just a little adjust in:
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--- Project -> Options -> Application -> Version Info: 1 or any other value > 0
--- Project -> Options -> Application -> Entitlement List: check the "Secure File Sharing"
--- Project -> Options -> Application -> Use Permissions: check the "read / write external storage" (if you go use i
t... any way, check it)
--- save your project to create the auxiliar files and store it in disk!
Now, all it's ready for use!
Now, you can create your FMX project for your client-app as expected in common use.
Let's create a sample for tests.
On RAD, do that:
--- File -> New - Firemonkey blank project
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--- add
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the
requirement
from
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--- add code to load the
catch the 排行
function address,
首library, 关
订阅专and release the library if not necessary any more.
页
注
Here my sample for your test:
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栏
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28
unit uView.FormMain;
interface
uses
System.SysUtils,
System.Types,
System.UITypes,
System.Classes,
System.Variants,
FMX.Types,
FMX.Controls,
FMX.Forms,
FMX.Graphics,
FMX.Dialogs,
FMX.Controls.Presentation,
FMX.StdCtrls,
System.Permissions,
FMX.Memo.Types,
FMX.ScrollBox,
FMX.Memo;
type
TForm1 = class(TForm)
BtnRequestPermissions: TButton;
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28.
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29.
How to create a Android SO library dinamically loaded in your FMX projects? by Emailx45_mb61025d8d39b66的技术博客_51CTO博客
BtnLoadSOandRun:
TButton;
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procedure FormCreate(Sender: TObject);
private
34.
页
注
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栏
procedure MyPermissionsHandler(Sender: TObject; const APermissions: TClassicStringDynArray; c
public
36.
37.
CTO训练营
procedure BtnLoadSOandRunClick(Sender: TObject);
32.
35.
企业培训
procedure首BtnRequestPermissionsClick(Sender:
关
排行
订阅专 TObject);
31.
33.
精培
Memo1: TMemo;
{ Public declarations }
end;
38.
39.
40.
var
Form1: TForm1;
41.
42.
implementation
43.
44.
45.
46.
47.
48.
uses
System.IOUtils,
Androidapi.JNI.JavaTypes,
Androidapi.Helpers,
Androidapi.JNI.Os;
49.
50.
{$R *.fmx}
51.
52.
53.
54.
const
MyFileSO: string
= 'libmydprmanuallibrary.so';
MyFuncName: string = 'IncrementThisValue';
55.
56.
57.
58.
var
MyFileSOPath: string;
MyFuncOnLib : function(AValue: integer): integer; cdecl;
59.
60.
procedure TForm1.MyPermissionsHandler(Sender: TObject; const APermissions: TClassicStringDynArray
61.
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63.
How to create a Android SO library dinamically loaded in your FMX projects? by Emailx45_mb61025d8d39b66的技术博客_51CTO博客
begin
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BtnLoadSOandRun.Enabled
:= 榜
true;
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Memo1.Lines.Add('permissions accepted by user');
end else begin
70.
BtnLoadSOandRun.Enabled := false;
71.
Memo1.Lines.Add('permissions refused by user');
73.
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//
begin
68.
72.
智能汽车
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JStringToString(TJManifest_permission.JavaClass.WRITE_EXTERNAL_STORAGE)]) then
67.
69.
学堂
JStringToString(TJManifest_permission.JavaClass.READ_EXTERNAL_STORAGE),
{ }
首
关
排行
订阅专
65.
66.
博客
if PermissionsService.IsEveryPermissionGranted([
end;
end;
74.
75.
procedure TForm1.BtnRequestPermissionsClick(Sender: TObject);
76.
begin
77.
PermissionsService.RequestPermissions([
{ }
78.
JStringToString(TJManifest_permission.JavaClass.READ_EXTERNAL_STORAGE),
79.
JStringToString(TJManifest_permission.JavaClass.WRITE_EXTERNAL_STORAGE)], { }
80.
MyPermissionsHandler);
81.
{ }
end;
82.
83.
procedure TForm1.FormCreate(Sender: TObject);
84.
begin
85.
86.
MyFileSOPath := IncludeTrailingPathDelimiter(TPath.GetDocumentsPath) + MyFileSO;
end;
87.
88.
procedure TForm1.BtnLoadSOandRunClick(Sender: TObject);
89.
var
90.
91.
MySOHandle: THandle;
begin
92.
MySOHandle
93.
@MyFuncOnLib := nil;
94.
//
:= 0;
95.
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96.
97.
How to create a Android SO library dinamically loaded in your FMX projects? by Emailx45_mb61025d8d39b66的技术博客_51CTO博客
//
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try
98.
Memo1.Lines.Add('trying
SafeLoadLibrary(MyFileSOPath)...
starting...');
首
关
排行
订阅专
99.
//
100.
Memo1.Lines.Add('Lib path: ' + MyFileSOPath);
101.
Memo1.Lines.Add('Lib
' + PWideChar(MyFileSOPath));
页
注 path: 榜
栏
102.
//
103.
(*
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104.
SafeLoadLibrary simply as a replacement for LoadLibrary.
105.
It has a second parameter witch is used to call SetErrorMode.
106.
That parameter is optional and defaults to SEM_NOOPENFILEERRORBOX which is NOT always what
107.
if the DLL you are loading depends on other DLLs which cannot be loaded, you will get a sys
108.
if not dialog error, not info about the "error" ... is it not?
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109.
110.
in Posix compilation:
111.
-- LoadLibrary(...), in fact, will calls: dlopen() function
112.
-- GetProcAddress(...), in fact, will calls: dlsym(), dladdr(), dlopne() and dlclose() func
113.
-- FreeLibrary(...), in fact, will calls: dlclose() function
114.
*)
115.
// MySOHandle := SafeLoadLibrary(MyFileSOPath);
116.
MySOHandle := LoadLibrary(PWideChar(MyFileSOPath)); // using Posix function:
117.
//
118.
if (MySOHandle > 0) then
119.
begin
dlopen(....)
120.
Memo1.Lines.Add('MySOHandle = ' + MySOHandle.ToString);
121.
//
122.
@MyFuncOnLib := GetProcAddress(MySOHandle, PWideChar(MyFuncName)); // using Posix function:
123.
//
124.
if Assigned(MyFuncOnLib) then
Memo1.Lines.Add('255 + 1 = ' + MyFuncOnLib(255).ToString)
125.
126.
else
Memo1.Lines.Add('MyFuncOnLib = nil');
127.
128.
129
end
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129.
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130.
131.
132.
How to create a Android SO library dinamically loaded in your FMX projects? by Emailx45_mb61025d8d39b66的技术博客_51CTO博客
else
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Memo1.Lines.Add('MySOHandle = 0');
finally
首
关
排行
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FreeLibrary(MySOHandle); // using Posix function:
133.
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dlclose(....)
//
134.
Memo1.Lines.Add('FreeLibrary(MySOHandle)...
done');
页
注
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end;
end;
end.
It's all folks!
good fun with this!
这是运行结果：
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别忘记发布so文件，如下图：
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