C # call C DLL library structure types of how the data transfer and accept returns, bosses code inst-CodePudding

C # written call c + + DLL library structure types of how the data transfer and accept returns, bosses code instruction;

CodePudding user response:

[MarshalAs (UnmanagedType ByValArray, SizeConst=20)]

CodePudding user response:

Public struct A
{
[MarshalAs (UnmanagedType ByValArray, SizeConst=20)]
Public String x {get; set; }
[MarshalAs (UnmanagedType ByValArray, SizeConst=20)]
Public String y {get; set; }
}

Public struct B
{
[MarshalAs (UnmanagedType ByValArray, SizeConst=20)]
Public StringBuilder X {get; set; }
[MarshalAs (UnmanagedType ByValArray, SizeConst=20)]
Public StringBuilder Y {get; set; }
}

CodePudding user response:

Please first baidu "c # pinvoke" information, understand the basic knowledge, because behind my hand knock code, just write general meaning,

 [ChartSet=ChartSet. Ansi]//there are some features labeling, according to what you baidu you understand 

Int VicQuery (CardidPacket pszCaridPacket, ref VicPacket pszVicPacket) 

[StructLayout (LayoutKind. Sequential CharSet=CharSet. Ansi)] 
Struct CardidPacketNo 
{
[MarshalAs (UnmanagedType ByValTStr, SizeConst=30)] 
Public string CardNo. 

//basic so, I'll seal a field, behind you continue to seal according to the above things, you are pictures, I this context compared with typing some small depressed 
} 

//behind another structure according to the above that you come, I will not continue to