C # calls C + + platform invoke p/invoke struct--one-dimensional, two-dimensional array with built-in data type, and string pointer "VI"

A one-dimensional array with built-in data types in the "1" structure

C + + code:

typedef struct _TESTSTRU3{INTIVALARRP[30]; WCHARSZCHARR[30];} TESTSTRU3;

Exportdll_api void Struct_changearr (TestStru3 *pstru) {if (NULL = = Pstru) {return;} Pstru->ivalarrp[0] = 8;LSTRCPYNW (Pstru->szcharr, L "as", +) wprintf (l "struct_changearr \ n");}

C # code: Define an array and specify its length through SizeConst (for character arrays, you can specify string directly)

[StructLayout (LayoutKind.Sequential, charset=charset.unicode)]public struct teststru3{    [MarshalAs ( UnmanagedType.ByValArray, sizeconst=30)] public    INT[]IVALARRP;    [MarshalAs (UnmanagedType.ByValTStr, SizeConst =)]    public string Szcharr;}; [DllImport ("ExportDll.dll", CharSet = charset.unicode)]public static extern void Struct_changearr (ref testStru3 Pstru);

Test:

Cexportdll.teststru3 stru3 = new Cexportdll.teststru3 (); Cexportdll.struct_changearr (ref STRU3);

a two-dimensional array with built-in data types in the "2" Structure

C + + code:

typedef struct _TESTSTRU7{INTM[5][5];} TestStru7;

Exportdll_api void Struct_change2darr (TestStru7 *pstru) {if (NULL = = Pstru) {return;} PSTRU->M[3][3] = 1;wprintf (L "Struct_change2darr \ n");}

C # code: splitting a two-dimensional array into two one-dimensional arrays

[StructLayout (LayoutKind.Sequential, charset=charset.unicode)]public struct teststru7pre{    [MarshalAs ( UnmanagedType.ByValArray, sizeconst=5)] public    int[]m;}; [StructLayout (layoutkind.sequential, CharSet = charset.unicode)]public struct teststru7{    [MarshalAs ( UnmanagedType.ByValArray, SizeConst = 5)] public    teststru7pre []m;}; [DllImport ("ExportDll.dll", CharSet = charset.unicode)]public static extern void Struct_change2darr (ref testStru7 Pstru );

Test:

Cexportdll.teststru7 stru7 = new Cexportdll.teststru7 (); Cexportdll.struct_change2darr (ref STRU7);

the "3" struct contains a string pointer

C + + code:

typedef struct _TESTSTRU9{WCHAR*PWCHARR; Char*pcharr;booliscbool; Boolisbool;} TestStru9;

Exportdll_api void Struct_changeptr (TestStru9 *pstru) {if (NULL = = Pstru) {return;} Pstru->isbool = True;pstru->isbool = True;pstru->pwcharr = (wchar*) cotaskmemalloc (8*sizeof (WCHAR));p stru- >pcharr = (char*) cotaskmemalloc (8*sizeof (CHAR)), LSTRCPYNW (Pstru->pwcharr, L "Ghj", 8); Lstrcpyna (pStru-> Pcharr, "Ghj", 8); wprintf (L "struct_changeptr \ n");}

C # code, defined as a string, note the difference between BOOL and bool :

[StructLayout (LayoutKind.Sequential, charset=charset.unicode)]public struct teststru9{    [MarshalAs ( UNMANAGEDTYPE.LPWSTR)] public    string Pwcharr;    [MarshalAs (UNMANAGEDTYPE.LPSTR)]    public string Pcharr;    [MarshalAs (UNMANAGEDTYPE.U1)]    public bool Iscbool;    [MarshalAs (Unmanagedtype.bool)]    public bool Isbool;}; [DllImport ("ExportDll.dll", CharSet = charset.unicode)]public static extern void Struct_changeptr (ref testStru9 Pstru);

Test:

<strong>cexportdll.teststru9 stru9 = new Cexportdll.teststru9 (); Cexportdll.struct_changeptr (ref stru9);</strong>

C # calls the C + + platform invoke P/invoke struct-a one-dimensional, two-dimensional array with built-in data types, and a string pointer of "six"