{"id":14219,"date":"2022-10-06T22:51:30","date_gmt":"2022-10-06T17:21:30","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-referencing-an-object-array-in-c-pinvoke\/"},"modified":"2022-10-06T22:51:30","modified_gmt":"2022-10-06T17:21:30","slug":"solved-referencing-an-object-array-in-c-pinvoke","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-referencing-an-object-array-in-c-pinvoke\/","title":{"rendered":"[Solved] Referencing an object array in C# PInvoke"},"content":{"rendered":"

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I finally found the solution to my problems, and am posting this for anyone who would need some clarification:<\/p>\n

First, as David pointed out, simply treating the referenced argument as a pointer and assigning it the array’s address does not work. You have to copy the entire array contents into the referenced array. Easily fixed.<\/p>\n

The second mistake was in the C# method signature; the descripton that was needed here was “[Out]”, with the brackets, compared to simply “out” (Once again, thanks David).<\/p>\n

So, the end result:<\/p>\n

The structs do not change, but the function signature in C# does:<\/p>\n

[DllImport(@\"Elemission.dll\", CallingConvention = CallingConvention.Cdecl)]\n    public static extern void getResults([Out] intensityType[] graphData);\n<\/code><\/pre>\n
and here is a snippet of the function call:<\/p>\n
int arraySize;\nDllMethods.executeAcquisition(out arraySize); \/\/ arraySize is the Struct array length\nintensityType[] resultData = new intensityType[arraySize];\nDllMethods.getResults(resultData);\n<\/code><\/pre>\n
Meanwhile in C++, the C# call is received by the wrapper and passed to the member function…<\/p>\n
__declspec(dllexport) void getResults(intensitytype* graphData)\n{\n    MainControl::getInstance()->getCamera()->getResults(graphData);\n}\n<\/code><\/pre>\n
…and lo and behold, the struct array is filled.<\/p>\n
void CameraControl::getResults(intensitytype* graphData)\n{\n    for (int i = 0; i < _spectroDataLength; i++)\n        graphData[i] = _spectroData[i];\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Referencing an object array in C# PInvoke <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] I finally found the solution to my problems, and am posting this for anyone who would need some clarification: First, as David pointed out, simply treating the referenced argument as a pointer and assigning it the array’s address does not work. You have to copy the entire array contents into the referenced array. Easily … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[361,324,421,3739],"class_list":["post-14219","post","type-post","status-publish","format-standard","hentry","category-solved","tag-arrays","tag-c","tag-pass-by-reference","tag-pinvoke"],"yoast_head":"\n[Solved] Referencing an object array in C# PInvoke - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-referencing-an-object-array-in-c-pinvoke\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Referencing an object array in C# PInvoke - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I finally found the solution to my problems, and am posting this for anyone who would need some clarification: First, as David pointed out, simply treating the referenced argument as a pointer and assigning it the array’s address does not work. 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