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分享C# 调用DLL动态库返回值的问题，请教~~~急！！！
c++里的函数
int GetInfo(long handle,unsigned char *tmp/*这个值要返回出来*/)
{
....................
retnum = classA->ReadData(tmp,1024);
}
int ClassA::ReadData(unsigned char* buffer/*void * buffer会报Invalid access to memory location错误*/, int limit )
{
...................
}
c#调用
[DllImport("CLib.dll", CharSet = CharSet.Ansi,EntryPoint = "GetInfo", CallingConvention = CallingConvention.Cdecl)]
public static extern int GetInfo(long handle,StringBuilder sb/*这里的值用ref，byte[] 都用过了，还不行*/)
请教~~~急！！！
int GetInfo(long handle,unsigned char *tmp/*这个值要返回出来*/)
{
....................
retnum = classA->ReadData(tmp,1024);
}
int ClassA::ReadData(unsigned char* buffer/*void * buffer会报Invalid access to memory location错误*/, int limit )
{
...................
}
c#调用
[DllImport("CLib.dll", CharSet = CharSet.Ansi,EntryPoint = "GetInfo", CallingConvention = CallingConvention.Cdecl)]
public static extern int GetInfo(long handle,StringBuilder sb/*这里的值用ref，byte[] 都用过了，还不行*/)
请教~~~急！！！
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tcmakebest 2013-08-27
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这是DLL的标准方式，只要修改 DllImport 里的就好了，如下：
CallingConvention.StdCall
LVOLCANO 2013-08-27
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多谢各位兄弟，我的编译方式改为 __stdcall 就好了，不知道为啥子
xfyxq 2013-08-26
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public static extern int GetInfo(int handle,StringBuilder sb)
FTD_2009 2013-08-26
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public static extern int GetInfo(int handle,StringBuilder sb)你这样改成试试支持二楼一下
zjzhong 2013-08-26
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[System.Runtime.InteropServices.DllImportAttribute("CLib.dll", EntryPoint="GetInfo")]
public static extern int GetInfo(int handle, System.IntPtr tmp) ;
string str = new string(' ', 1024);
IntPtr tmp = Marshal.StringToHGlobalAnsi(str);
int i = GetInfo(10, tmp);
string returnStr = Marshal.PtrToStringAnsi(tmp);
