我正在尝试使用cgo从dll运行功能。该库是用c ++编写的，因此我创建了一个C头，这里是定义的函数和一个.cpp文件，其中是实现。
lib.h：
#ifdef __cplusplus
extern "C" {
#endif
void* LoadEngine(char*);
#ifdef __cplusplus
}
#endif
lib.cpp：
#include <Engine.h> //the library
void* LoadEngine(char *sn) {
Engine *e;
GetEngineObject(sn, &e); //function from the dll, here it fails
return (void*) e;
}
然后通过以下方式调用它：
package main
/*
#include "lib.h"
*/
import "C"
func main() {
e := C.LoadEngine(C.CString("foobar")
...
}
我有go1.12 windows/amd64
和mingw-w64-posix-seh
也尝试过mingw-w64-posix-sjlj，mingw-w64-win32-seh，mingw-w64-win32-sjlj，但是结果相同，或者根本无法编译
仅使用go build和：
#cgo windows CFLAGS: -IC:/Engine/Inc
#cgo windows CPPFLAGS: -IC:/Engine/Inc
#cgo windows LDFLAGS: -LC:/Engine/Bin64 -lEngine -lEngineObj -lole32 -loleaut32 -luuid
在win8上它运行正常，但是在win10 +上它不起作用，如果该函数调用来自dll的GetEngineObject，它将失败并显示以下信息：
Exception 0x40010006 0x1 0x8deb90 0x7ffbc9ada388
PC=0x7ffbc9ada388
runtime: unknown pc 0x7ffbc9ada388
stack: frame={sp:0x8dea80, fp:0x0} stack=[0x0,0x8dfdf0)
00000000008de980: 0000000002000002 000000002a080321
00000000008de990: 0000000090000191 0000000000000321
00000000008de9a0: 0000000500000008 0000000500000000
00000000008de9b0: feeefeeefeeefeee 00000000024c0150
00000000008de9c0: 0000000000000000 0000000000000000
00000000008de9d0: 00000000024c0000 00007ffbccb730ac
00000000008de9e0: 0000000002680000 00000000024c1e30
00000000008de9f0: 00000000026a2d90 00000000026ad480
00000000008dea00: 0000000000000df1 0000000000000000
00000000008dea10: 0000000000000df1 0000000000000df1
00000000008dea20: 0000000000001bf8 0000000000000000
00000000008dea30: 0000000090000191 0000000000000003
00000000008dea40: 0000bcc3daf1f4cb 00000000026a2d00
00000000008dea50: 0000000000000000 000002fffb442d78
00000000008dea60: 0000000000000000 00000000008dfb00
00000000008dea70: 0000000000000020 00007ffbc9ada388
00000000008dea80: <00000000024c0000 000000002fbe1490
00000000008dea90: 00000000008df970 00000000ffffffff
00000000008deaa0: 0000000040010006 0000000000000000
00000000008deab0: 00007ffbc9ada388 0000000000000002
00000000008deac0: 0000000000000001 00000000008deb90
00000000008dead0: 00000000001b0150 0000000000800000
00000000008deae0: 00000000026ad480 0000000000000000
00000000008deaf0: 00000000001b10b0 0000000000690000
00000000008deb00: 00000000024c0000 00007ffbccbbcafa
00000000008deb10: 00000000024c0000 00007ffbccb76ff8
00000000008deb20: 00000000026a2d90 00000000026a9c30
00000000008deb30: 0000000000000000 0000000000000001
00000000008deb40: 00002c98037a65f6 000000000000001f
00000000008deb50: 00000000026a9430 000000002fd8a367
00000000008deb60: 0000000000006000 00000000024c0000
00000000008deb70: 0000000000000df1 0000000000000000
runtime: unknown pc 0x7ffbc9ada388
stack: frame={sp:0x8dea80, fp:0x0} stack=[0x0,0x8dfdf0)
00000000008de980: 0000000002000002 000000002a080321
00000000008de990: 0000000090000191 0000000000000321
00000000008de9a0: 0000000500000008 0000000500000000
00000000008de9b0: feeefeeefeeefeee 00000000024c0150
00000000008de9c0: 0000000000000000 0000000000000000
00000000008de9d0: 00000000024c0000 00007ffbccb730ac
00000000008de9e0: 0000000002680000 00000000024c1e30
00000000008de9f0: 00000000026a2d90 00000000026ad480
00000000008dea00: 0000000000000df1 0000000000000000
00000000008dea10: 0000000000000df1 0000000000000df1
00000000008dea20: 0000000000001bf8 0000000000000000
00000000008dea30: 0000000090000191 0000000000000003
00000000008dea40: 0000bcc3daf1f4cb 00000000026a2d00
00000000008dea50: 0000000000000000 000002fffb442d78
00000000008dea60: 0000000000000000 00000000008dfb00
00000000008dea70: 0000000000000020 00007ffbc9ada388
00000000008dea80: <00000000024c0000 000000002fbe1490
00000000008dea90: 00000000008df970 00000000ffffffff
00000000008deaa0: 0000000040010006 0000000000000000
00000000008deab0: 00007ffbc9ada388 0000000000000002
00000000008deac0: 0000000000000001 00000000008deb90
00000000008dead0: 00000000001b0150 0000000000800000
00000000008deae0: 00000000026ad480 0000000000000000
00000000008deaf0: 00000000001b10b0 0000000000690000
00000000008deb00: 00000000024c0000 00007ffbccbbcafa
00000000008deb10: 00000000024c0000 00007ffbccb76ff8
00000000008deb20: 00000000026a2d90 00000000026a9c30
00000000008deb30: 0000000000000000 0000000000000001
00000000008deb40: 00002c98037a65f6 000000000000001f
00000000008deb50: 00000000026a9430 000000002fd8a367
00000000008deb60: 0000000000006000 00000000024c0000
00000000008deb70: 0000000000000df1 0000000000000000
goroutine 1 [syscall]:
path/to/package._Cfunc_LoadEngine(0x23a2c20, 0x0)
_cgo_gotypes.go:518 +0x51
path/to/package.Load(0x4d05ad, 0x1d, 0x0, 0x0, 0x0)
C:/Users/microo8/Documents/workspace/src/path/to/package/fre.go:55 +0x89
main.main()
W:/Workspace/src/path/to/package/test/test.go:12 +0x41
rax 0x3e00003e
rbx 0x2fbe1490
rcx 0xfffffffffffffffe
rdi 0xffffffff
rsi 0x8df970
rbp 0x20
rsp 0x8dea80
r8 0x2fca2793
r9 0x3a0f4c0
r10 0x2fca2701
r11 0x26aadb0
r12 0x8dfb00
r13 0x0
r14 0x2fffb442d78
r15 0x0
rip 0x7ffbc9ada388
rflags 0x202
cs 0x33
fs 0x53
gs 0x2b
我还尝试使用mingw的__try1和__except1捕获异常，但是无论如何它还是失败了。使用-ldflags="-linkmode internal"尝试了不同的mingw版本，但这无法编译，-ldflags="-linkmode external"也会出现此异常。
EDIT：也尝试从C程序调用{{1}}函数（来自LoadEngine），并且工作正常。将lib.h与lib.cpp编译为g++。并将其链接到lib.o，我刚刚从test.c函数中调用了LoadEngine。因此，也许怎么了？如何将库链接到cgo？
答案 0 :(得分：0)
出于某种原因，在win10 +上它将提高DBG_PRINTEXCEPTION_C。这是由OutputDebugStringW引起的，并且没有调试器在监听。
我认为通常可以使用Microsoft的__try and __except完成，但是在MinGW中，只有__try1和__except1，我认为它们只能在32位系统上运行（关于这方面的文档很少）
但是我发现，您可以添加一个Exception Handler
现在是lib.cpp：
#include <Engine.h> //the library
#ifdef _WIN32
#include <windows.h>
LONG WINAPI VectoredHandler(struct _EXCEPTION_POINTERS *ExceptionInfo) {
UNREFERENCED_PARAMETER(ExceptionInfo);
return EXCEPTION_CONTINUE_EXECUTION; //just continue
}
#endif
void* LoadEngine(char *sn) {
#ifdef _WIN32
PVOID handler = AddVectoredContinueHandler(1, VectoredHandler);
#endif
Engine *e;
GetEngineObject(sn, &e);
#ifdef _WIN32
RemoveVectoredContinueHandler(handler);
#endif
return (void*) e;
}
因为使用该库从加载引擎开始到卸载引擎结束，并且引擎是单例，所以我刚刚将PVOID handler设置为全局单例，并且将AddVectoredContinueHandler设置为{ {1}和LoadEngine在RemoveVectoredContinueHandler中。