Vala GUI和C ++中的逻辑

问题描述

我有一个使用SDL的绘图程序，用C ++编写。我想只在Vala创建一个图形界面，并使用它从一个程序调用函数（函数是准备使用，我只想从GUI调用它们）。我正在寻找解决方案作为VAPI，我在想使用GObject，但我不能接受两者。有没有人做过类似的事情，你能建议我解决我的问题吗？

解决方案

如果你想使用C ++代码Vala我们正确地准备他们。这是一个例子。

首先，你必须告诉 valac 编译器函数定义在其他地方。让我们使用 extern 指令。

  // ccodetest.vala 
 extern void cpp_test_function ）; 
 
 void main（）{
 stdout.printf（This is Vala code\\\
）; 
 cpp_test_function（）;然后，C ++中的函数与从C中派生的对象文件正确链接，因此，我们将它们声明为 externC。
  // cpplibrary.cpp 
＃ include 
 
 using namespace std; 
 
 externCvoid cpp_test_function（）{
 cout< 这是一个C ++代码\\\
; 
} 
  
当我们准备好，我们可以编译Vala代码到C.我们得到 ccodetest.c 。
 
 
 
  valac -C ccodetest.vala  
 
 
 
现在我们可以使用 gcc 来编译目标文件。我们得到 ccodetest.o 。
 
 
 
  gcc-o ccodetest.o ccodetest.ccI / usr / include / glib-2.0 / -I /usr/include/glib-2.0/glib/ -I /usr/lib/glib-2.0/include /  
 
 
 
 File C ++编译如下。
 
 
 
  g ++ -o cpplibrary.cpp.o cpplibrary.cpp -c  
 
 
 
最后我们链接这两个文件。
 
 
 
  g ++ -o ccode_test ccodetest.o cpplibrary.cpp.o -L / usr / lib / -lglib-2.0 -lgobject-2.0  
 
 
 
如下：
  $ ./ccode_test 
这是Vala代码
这是一个C ++代码
  
 
I have a drawing program that uses SDL, written in C++. I would like to create a graphical interface only in Vala and use it to call functions from a program (functions are ready to use and I only want to call them from the GUI). I was looking for solutions as VAPI, and I was thinking of using GObject, but I can not embrace both. Has anyone done similar things and can you suggest me a solution to my problem?
 解决方案 
If you want to use the C++ code in Vala we prepare them properly. Here's an example.
First you have to tell the valac compiler that the function is defined somewhere else. Let's use the extern directive.
// ccodetest.vala
extern void cpp_test_function ();

void main () {
    stdout.printf ("This is Vala code\n");
    cpp_test_function ();
}
Then the functions in C++ are properly linked with the object files derived from C, we declare them as extern "C".
// cpplibrary.cpp
# include

using namespace std;

extern "C" void cpp_test_function () {
    cout << "This is a C + + code\n";
}
When we are so ready, we can compile Vala code to C. We get ccodetest.c.
valac -C ccodetest.vala
Now we can use gcc to compile the object file. We get ccodetest.o.
gcc-o ccodetest.o ccodetest.c-c-I /usr/include/glib-2.0/ -I /usr/include/glib-2.0/glib/ -I /usr/lib/glib-2.0/include/
File C++ compile as follows.
g++ -o cpplibrary.cpp.o cpplibrary.cpp -c
At the end we linking both files.
g++ -o ccode_test ccodetest.o cpplibrary.cpp.o -L /usr/lib/ -lglib-2.0 -lgobject-2.0
The program works as follows:
$ ./ccode_test
This is Vala code
This is a C++ code
                        
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