编辑(谢谢 ildjarn!):通过将委托(和要匹配的回调函数签名)更改为解决
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void InstallStatusDel([MarshalAs(UnmanagedType.LPStr)]string Mesg, int Status);
原帖:
我有一个用 C# 编写的调用 C dll 中的函数的 .net 应用程序的问题。我看过其他有类似问题的主题,但我一定错过了一些不同的东西。当我在 C# 中调试它时,我能够在 InstallStatusCallback 中打断点,但是当执行退出 InstallStatusCallback 时,会出现 AccessViolationException。我尝试使用 C 进行调试,并且在执行从回调返回之前发生访问冲突。感谢您的任何意见。
C dll 中的项目设置默认设置为使用 __cdecl。在 C DLL 领域中,有以下代码:
typedef void (__cdecl *StatusCallback)(const char* Mesg, int Status);
__declspec(dllexport) int Install(void* thing1, void* thing2, void* thing3, StatusCallback Func);
int Install(void* thing1, void* thing2, void* thing3, StatusCallback Func)
{
Func("msg", 3);
return 0;
}
在 C# 中,我有:
public partial class InstallerStatus : Form
{
[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
public delegate void InstallStatusDel(StringBuilder Mesg, int Status);
public static extern int Install(IntPtr thing1, IntPtr thing2, IntPtr thing3, InstallStatusDel Func);
[DllImport("myDll.dll", CallingConvention = CallingConvention.Cdecl)]
private IntPtr mThing1;
private IntPtr mThing2;
private InstallStatusDel mInstallStatusFunc;
private BackgroundWorker mInstallWorker;
public InstallerStatus(IntPtr pThing1, IntPtr pThing2)
{
InitializeComponent();
mThing1 = pThing1;
mThing2 = pThing2;
mInstallStatusFunc = InstallStatusCallback;
mProgressBar.Minimum = 0;
mProgressBar.Maximum = 100;
mProgressBar.Value = 0;
mInstallWorker = new BackgroundWorker();
mInstallWorker.DoWork += new DoWorkEventHandler(InstallWork);
mInstallWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(InstallWork_Completed);
}
private void InstallWork(object sender, DoWorkEventArgs e)
{
Install(mThing1, mThing2, IntPtr.Zero, mInstallStatusFunc);
}
private void InstallWork_Completed(object sender, RunWorkerCompletedEventArgs e)
{
Close();
}
private void InstallStatusCallback(StringBuilder PartName, int Status)
{
}
private void InstallLoad_Shown(object sender, EventArgs e)
{
mInstallWorker.RunWorkerAsync();
}
}