因为几天我试图从C调用一些D代码(带有为C和D定义的类/接口).
D代码
module BufferCppBinding;
extern (C++) void *createBufferCppBinding() {
BufferCppBinding ptr = new BufferCppBinding();
return cast(void*)ptr;
}
extern (C++) interface BufferCppBindingInterface {
void construct();
// ...
}
class BufferCppBinding : BufferCppBindingInterface {
public Buffer thisPtr;
public extern (C++) void construct() {
// doesn't do anything
}
}
用于将类型声明为C land的C代码:
class BufferCppBinding {
public:
virtual void construct();
};
为了初始化D运行时,我在D中编写了一个小函数,它在D land中执行:
extern (C++) void initDRuntime() nothrow{
try
{
Runtime.initialize();
//result = myWinMain(hInstance, hPrevInstance, lpCmdLine, iCmdShow);
//Runtime.terminate(&exceptionHandler);
}
catch (Throwable o)
{
//MessageBox(null, o.toString().toUTF16z, "Error", MB_OK | MB_ICONEXCLAMATION);
//result = 0;
}
}
用法(C):
BufferCppBinding *vertexBuffer = reinterpret_cast<BufferCppBinding*>(createBufferCppBinding());
// here happens the crash
vertexBuffer->construct();
我正在使用g 5.2和ldc2编译代码并将其与ldc2链接.
我刚拿到一个SIGSEGV.
最佳答案 返回指向GC堆的指针是一个坏主意 – 使用malloc / emplace(或std.experimental.allocator.make)代替并调用ffon.这不会运行析构函数,所以也许你想要公开一个调用destroy`的D函数.
顺便说一句,不需要返回void *并强制转换 – 只需从createBufferCppBinding返回BufferCppBindingInterface.