struct

问题 I want to convert data from a device from bites to float I use the code from this answer bytes to float import struct byte_file = b'+001.80\r' print(type(byte_file)) y = struct.unpack('f' , byte_file) print(y) I get this struct.error: unpack requires a buffer of 4 bytes The correct outcome should be 1.80 do I need to implement a buffer argument ? 回答1: struct is used for binary packed data - data that is not human-readable. b'+001.80\r' is 8 bytes long: b'+', b'0', b'0', b'1', b'.', ... . You

问题 Is there any workaround for the error CS1663 ("Fixed size buffer type must be one of the following: bool, byte, short, int, long, char, sbyte, ushort, uint, ulong, float or double.")? I need to declare a unsafe fixed array from another blittable custom type struct but I'm stuck in this compiler error. Showing some code to elucidate the problem below. struct s1 { byte _b1; byte _b2; } unsafe struct s2 { fixed s1 _s1[5]; // CS1663 here... } Note that the two structs are blittable, so the error

问题 Is there any workaround for the error CS1663 ("Fixed size buffer type must be one of the following: bool, byte, short, int, long, char, sbyte, ushort, uint, ulong, float or double.")? I need to declare a unsafe fixed array from another blittable custom type struct but I'm stuck in this compiler error. Showing some code to elucidate the problem below. struct s1 { byte _b1; byte _b2; } unsafe struct s2 { fixed s1 _s1[5]; // CS1663 here... } Note that the two structs are blittable, so the error

问题 I need to create a matrix containing structs. My struct: typedef struct { int a; int b; int c; } myStruct; My method to create matrix: myStruct (*matrix)[WIDTH] = malloc(HEIGHT * sizeof *matrix); How can I pass my matrix to a function to do something? 回答1: In C89, WIDTH must be a constant and you can simply pass the matrix this way: #include <stdlib.h> #define WIDTH 5 typedef struct { int a; int b; int c; } myStruct; void init_matrix(myStruct matrix[][WIDTH], int height) { for (int i = 0; i <

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 20 hours ago . Improve this question Been programming for a while(C#). However, as I have been getting more in depth concerning the Stack and Heap, the concept of instances of a class type(user-defined and/or predefined) and a struct type(user-defined and/or predefined) still confuses me. This

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 20 hours ago . Improve this question Been programming for a while(C#). However, as I have been getting more in depth concerning the Stack and Heap, the concept of instances of a class type(user-defined and/or predefined) and a struct type(user-defined and/or predefined) still confuses me. This

问题 I have a main function, where I initiate a variable, a client. For example: func main() { myClient := my.MustNewClient("localhost") } Now I want to pass this client to another package, but for some reason I cannot figure out how to do this. My package looks like this: package rest import ( "net/http" "github.com/Sirupsen/logrus" ) type AssetHandler struct { mc my.Client } func (f AssetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { logrus.Info("bla") // here I want to use the

问题 I have a main function, where I initiate a variable, a client. For example: func main() { myClient := my.MustNewClient("localhost") } Now I want to pass this client to another package, but for some reason I cannot figure out how to do this. My package looks like this: package rest import ( "net/http" "github.com/Sirupsen/logrus" ) type AssetHandler struct { mc my.Client } func (f AssetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { logrus.Info("bla") // here I want to use the

问题 I have two projects one in C and the other in C++ and I try to cast a class object in C++ to a structure object in C. For example, I have an object from myClass which I'm trying to cast to myStru as follows: In my C++ project I have this class: class myClass{ myClass(); ~myClass(); char *data; int var; } In my C project I have this structure: struct myStru { char *data; int var; }; typedef struct myStru myStru; Now in my C++ project I create an object from myClass : myClass *classObj = new

问题 I mean to use a struct to hold a "table": % Sample data % idx idxstr var1 var2 var3 % 1 i01 3.5 21.0 5 % 12 i12 6.5 1.0 3 The first row contains the field names. Assume I created a struct ds2 = struct( ... 'idx', { 1, 12 }, ... 'idxstr', { 'i01', 'i12' }, ... 'var1', { 3.5, 6.5 }, ... 'var2', { 21, 1 }, ... 'var3', { 5, 3 } ... ); How can I retrieve the value for field var2 , for the row corresponding to idxstr equal to 'i01' ? Note: that I cannot ensure the length of idxstr elements will