我有一个棘手的错误,我找不到。我正在从C#到我编写的本地DLL绑定。 后期绑定似乎工作正常。我添加回调后出现问题。C到C#的回调在一段时间后引发异常
的回调定义为这样(在C)(在DLL中全球范围):
typedef void (*FinishedDelegate) (ProcessResult a_bResult);
typedef void (*DownloadStatusUpdateDelegate) (int a_iParametersDownloaded, int a_iTotalParameters);
typedef void (*DownloadFinishedDelegate) (char* a_sConfiguration_values, ProcessResult a_bResult);
DownloadStatusUpdateDelegate pfDownloadStatusUpdateDelegate = NULL;
DownloadFinishedDelegate pfDownloadFinishedDelegate = NULL;
此功能输出:
PLUGIN_API BOOL DownloadConfigration(DownloadStatusUpdateDelegate a_pfStatusDelegate, DownloadFinishedDelegate a_pfFinishedDelegate);
这是本机功能的实现:
DWORD WINAPI DownloadThreadFunc(void* a_pParam)
{
while (g_iParameterDownloaded < PARAMETER_COUNT)
{
if (IsEventSignaled(g_hAbortEvent))
{
CallDownloadFinished(PROCESS_ABORT);
return 0;
}
Sleep(STATUS_DELAY);
CallDownloadStatusUpdate();
g_iParameterDownloaded += STATUS_PARAMS_JUMP;
}
CallDownloadFinished(PROCESS_SUCCESS);
return 0;
}
PLUGIN_API BOOL DownloadConfigration(DownloadStatusUpdateDelegate a_pfStatusDelegate, DownloadFinishedDelegate a_pfFinishedDelegate)
{
if (IsEventSignaled(g_hInProcessEvent))
return false;
pfDownloadStatusUpdateDelegate = a_pfStatusDelegate;
pfDownloadFinishedDelegate = a_pfFinishedDelegate;
g_iParameterDownloaded = 0;
DWORD l_dwResult = WaitForSingleObject(g_hThreadsStructGuardian, INFINITE);
if (l_dwResult == WAIT_OBJECT_0)
{
g_ahThreads[PLUGIN_THREAD_DOWNLOAD] = CreateThread(NULL, 0, DownloadThreadFunc, 0, 0, NULL);
ReleaseMutex(g_hThreadsStructGuardian);
return true;
}
return false;
}
在管理端,功能在这里称为:
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void DownloadStatusUpdateDelegate(int a_iParametersDownloaded, int a_iTotalParameters);
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
private delegate void DownloadFinishedDelegate_Native(StringBuilder a_sConfigurationValues, EPluginProcessResult a_eResult);
private void OnDownloadStatusUpdate(int a_iParametersDownloaded, int a_iTotalParameters)
{
if (DownloadStatusUpdate != null)
{
DownloadStatusUpdate(a_iParametersDownloaded, a_iTotalParameters);
}
}
private void OnDownloadFinished(StringBuilder a_sConfigurationValues, EPluginProcessResult a_eResult)
{
if (DownloadFinished != null)
{
DownloadFinished(a_sConfigurationValues.ToString(), a_eResult);
}
}
public bool DownloadConfiguration()
{
bool l_bResult = DLLDownloadConfigration(OnDownloadStatusUpdate, OnDownloadFinished);
return l_bResult;
}
奇怪的是 - 它工作了一段时间。一段时间后,我会得到一个“特权指令”异常,但是当我降低STATUS_DELAY时,发生的情况会更少。异常显示在IsEventSignaled函数 - 但没有什么。
下载线程会同步到c#GUI线程以更新GUI。
我一直在这个问题上的方式太多的时间。它看起来像一个经典的调用约定问题,但我彻底验证了它!
任何想法?
是的,就是这样 - 你不能将托管函数传递给非托管代码。这就是为什么我首先定义了这些代表。 – Nitay
对不起,在代码混乱。谢谢你的帮助! – Nitay