C ++在C＃非托管的DLL [英] C++ unmanaged DLL in c#
问题描述
我一直在问到G642.44各级摄像头ZoneTrigger在我的项目。在该网站提供的SDK是C ++也样本。我已经能够得到一些功能工作。我一直停留的地方是一个函数，其中的char *是传递参数。我做了很多的挖掘，并已经开始知道的MarshalAs已经被使用...
我想从
C导入功能++代码
//头文件
结构ZT_TRIG_STRUCT
{
INT asize的; // STRUCT大小
INT CameraIndex;
INT SpotIndex;
INT SpotType;
焦炭SpotName [32];
DWORD假人[16];
};
的typedef INT（WINAPI * f_ZT_EnumerateHotSpots）（INT SpotIndex，字符*名称，INT * SpotType）;
/ *
。您的应用程序可以调用此功能是通过遍历SpotIndex参数检索有关的信息点。
名称是指向您的应用程序提供一个32字节的缓冲区。
SpotType是一个指向应用程序的32位整数。
返回值：
0 =成功，名称和SpotType已初始化与区域触发
1 =错误，我们已经失去了通信2 = Enumaration结束后，所有的景点有被枚举。您的应用程序应增加SpotIndex，直到该函数将返回区域触发
INT 2.
* /
//代码
//枚举当前点I = 0;
焦炭SpotName [32];
INT SpotType;
查看= ZT_EnumerateHotSpots（I，SpotName，&安培; SpotType）;
同时（检查== 0）
{
浮动灵敏度= ZT_GetSensitivity（I）
的printf（区域触发点：％s的灵敏度：0.1F％%% \r\\\
，SpotName，灵敏度* 100）;
查看= ZT_EnumerateHotSpots（++我，SpotName，&安培; SpotType）;
}
转换为C＃
$ B $时，
所以， b
函数[DllImport（ZTcom.dll）]
私人静态外部INT ZT_EnumerateHotSpots（INT I，[的MarshalAs（UnmanagedType.LPWStr）裁判串SpotName，文献INT SpotType）;
公共不安全结构ZT_TRIG_STRUCT
{
公众诠释asize的; // STRUCT大小
公众诠释CameraIndex;
公众诠释SpotIndex;
公众诠释SpotType;
公共字符串SpotName;
//[MarshalAs(UnmanagedType.LPStr，SizeConst = 256）]串SpotName;
//公众的IntPtr SpotName;
}
//在代码中
INT I = 0;
串SpotName;
INT SpotType;
查看= ZT_EnumerateHotSpots（I，REF SpotName，裁判SpotType）;
以上行给出：
键入System.ExecutionEngineException引发的异常。
错误。
我知道，问题是SpotName，它是一个字节[32]，如果我不使用的MarshalAs，而不是我用的只是烧焦它的工作原理n给出的第一个字符..
，其中它工作正常n中的代码给出第一个字符是以下
公共不安全结构ZT_TRIG_STRUCT
{
公众诠释asize的; // STRUCT大小
公众诠释CameraIndex;
公众诠释SpotIndex;
公众诠释SpotType;
公共字符SpotName;
}
函数[DllImport（ZTcom.dll）]
私人静态外部INT ZT_EnumerateHotSpots（INT I，楼盘焦炭SpotName，楼盘INT SpotType）;
公共字符SpotName;
INT I = 0;
查看= ZT_EnumerateHotSpots（I，REF SpotName，裁判SpotType）;
同时（检查== 0）
{
浮动灵敏度= ZT_GetSensitivity（I）
textBox1.Text = textBox1.Text +\r\\\
+区域触发点：+ SpotName +灵敏度：+（感光度* 100）的ToString（）;
查看= ZT_EnumerateHotSpots（++我，裁判SpotName，裁判SpotType）;
}
但如果我把的char []它给
方法的类型签名不兼容互操作。 ERROR
我在这里跑出选项....我在哪里出了错？我应该使用的MarshalAs或的char []？
请帮助.....
在此先感谢....
我可以' ZT_TRIG_STRUCT T看到你正在使用，但应该声明如下：
[StructLayout（LayoutKind.Sequential，字符集= CharSet.Ansi）]
公共结构ZT_TRIG_STRUCT
{
公众诠释asize的;
公众诠释CameraIndex;
公众诠释SpotIndex;
公众诠释SpotType;
[的MarshalAs（UnmanagedType.ByValTStr，SizeConst = 32）]
公共字符串SpotName;
[的MarshalAs（UnmanagedType.ByValArray，SizeConst = 16）]
公共UINT []假;
}
你有另一个问题是在的声明ZT_EnumerateHotSpots 。这应该是：
函数[DllImport（ZTcom.dll，字符集= CharSet.Ansi）]
私有静态EXTERN INT ZT_EnumerateHotSpots（
INT SpotIndex，
StringBuilder的SpotName，
OUT INT SpotType
）;
当我读它， SpotName 实际上是out参数，即您提供一个缓冲和 ZT_EnumerateHotSpots 写吧。
然后调用这个像这样
INT SpotIndex = 0;
StringBuilder的SpotName =新的StringBuilder（32）;
INT SpotType;
INT结果= ZT_EnumerateHotSpots（SpotIndex，SpotName，出SpotType）;
I've been asked to intergrate webcam ZoneTrigger in my project. The SDK provided in the site is C++ also the sample. I've been able to get few functions to work. the place i've been stuck is a function where char* is a parameter passed. I did a lot of digging and have come to know that MarshalAs has to be used...
the function i'd like to import from c++ code
//header file
struct ZT_TRIG_STRUCT
{
int aSize; //STRUCT size
int CameraIndex;
int SpotIndex;
int SpotType;
char SpotName[32];
DWORD Dummy[16];
};
typedef int (WINAPI *f_ZT_EnumerateHotSpots)(int SpotIndex, char *Name, int *SpotType);
/*
You application can call this functions to retrieve information about spots by iterating the SpotIndex param.
Name is a pointer to a 32 byte buffer supplied by your application.
SpotType is a pointer to an 32 bit integer in your application.
Return value:
0 = Success, the Name and SpotType have been initialized
1 = Error, we have lost communication with Zone Trigger
2 = Enumaration is over, all spots have been enumerated. Your application should increment SpotIndex until this function returns 2.
*/
//code
//Enumerate current spots in Zone Trigger
int i=0;
char SpotName[32];
int SpotType;
check = ZT_EnumerateHotSpots(i, SpotName, &SpotType);
while (check == 0)
{
float sensitivity = ZT_GetSensitivity(i);
printf("Zone Trigger spot: %s Sensitivity: %0.1f%%\r\n", SpotName, sensitivity*100);
check = ZT_EnumerateHotSpots(++i, SpotName, &SpotType);
}
So when converting to c#
[DllImport("ZTcom.dll")]
private static extern int ZT_EnumerateHotSpots(int i, [MarshalAs(UnmanagedType.LPWStr)]ref string SpotName, ref int SpotType);
public unsafe struct ZT_TRIG_STRUCT
{
public int aSize; //STRUCT size
public int CameraIndex;
public int SpotIndex;
public int SpotType;
public string SpotName ;
//[MarshalAs(UnmanagedType.LPStr, SizeConst = 256)] string SpotName;
// public IntPtr SpotName;
}
//In code
int i = 0;
string SpotName;
int SpotType;
check = ZT_EnumerateHotSpots(i, ref SpotName, ref SpotType);
the above line gives:
Exception of type 'System.ExecutionEngineException' was thrown.
ERROR.
i know that the problem is in SpotName,Its a byte[32], if i dont use marshalAs,instead i use just char it works n gives the first char.. the code where it works fine n gives first char is below
public unsafe struct ZT_TRIG_STRUCT
{
public int aSize; //STRUCT size
public int CameraIndex;
public int SpotIndex;
public int SpotType;
public char SpotName ;
}
[DllImport("ZTcom.dll")]
private static extern int ZT_EnumerateHotSpots(int i, ref char SpotName, ref int SpotType);
public char SpotName;
int i = 0;
check = ZT_EnumerateHotSpots(i, ref SpotName, ref SpotType);
while (check == 0)
{
float sensitivity = ZT_GetSensitivity(i);
textBox1.Text = textBox1.Text + "\r\n" +"Zone Trigger spot: " + SpotName + " Sensitivity: " + (sensitivity * 100).ToString();
check = ZT_EnumerateHotSpots(++i, ref SpotName, ref SpotType);
}
but if i put char[] it gives
Method's type signature is not Interop compatible. ERROR
i've run out of options here.... where have i gone wrong? should i use MarshalAs or char[]??? please help..... thanks in Advance....
I can't see where you are using ZT_TRIG_STRUCT, but that should be declared like this:
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct ZT_TRIG_STRUCT
{
public int aSize;
public int CameraIndex;
public int SpotIndex;
public int SpotType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)]
public string SpotName;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
public uint[] Dummy;
}
The other problem you have is in the declaration of ZT_EnumerateHotSpots. That should be:
[DllImport("ZTcom.dll", CharSet=CharSet.Ansi)]
private static extern int ZT_EnumerateHotSpots(
int SpotIndex,
StringBuilder SpotName,
out int SpotType
);
As I read it, SpotName is actually an out parameter, i.e. you supply a buffer and ZT_EnumerateHotSpots writes to it.
You then call this like so
int SpotIndex = 0;
StringBuilder SpotName = new StringBuilder(32);
int SpotType;
int result = ZT_EnumerateHotSpots(SpotIndex, SpotName, out SpotType);
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