Indispensable Windows Native (1), windowsnative

Indispensable Windows Native (1), windowsnative

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Indispensable Windows Native (1)-C language: hello c

Author: webabcd


Introduction
Indispensable C language for Windows Native

• Call C/C ++ in Windows Store Apps
• Hello c

Example
1. demonstrate how to call C/C ++ in Windows Store Apps (C #) and create a Windows Runtime Component (C ++) project
NativeDll/Simple. h

/**. H header file * // ensure that the header file is compiled only once (even if it is referenced multiple times, it is compiled only once) # pragma once namespace NativeDll // namespace {public ref class Simple sealed // class {public: int Add (int x, int y); // method };}

NativeDll/Simple. cpp

/**. Cpp implementation file ** to support Windows Runtime Component, Microsoft created the Visual C ++ component extensions (C ++/CX) is introduced ), it can be seen as a bridge between the "Caller" and "C/C ++". The metadata is windows metadata (. winmd) files * to enable the "Caller" to call Windows Runtime Component, C ++/CX has its own data types, for example, the String is of the Platform: String ^ type, in this way, the caller can call * for knowledge about C ++/CX, see: https://msdn.microsoft.com/en-us/library/hh755822.aspx */# include "pch. h "// pre-compiled header file # include" Simple. h "// the header file to be implemented // The namespace using namespace NativeDll defined in the header file; // The method int Simple: Add (int x, int y) in the header file) {return x + y ;}

NativeDemo/Simple. xaml. cs

/** Demonstrate how to use C # To Call The Windows Runtime Component (C ++) corresponding to C ++ **. For details, refer to the NativeDll project * Note: The Windows Runtime Component project will be generated. winmd file, winmd-Windows Metadata, Which is language-independent */using Windows. UI. xaml. controls; using Windows. UI. xaml. navigation; namespace NativeDemo. demo {public sealed partial class Simple: Page {public Simple () {this. initializeComponent ();} protected override void OnNavigatedTo (NavigationEventArgs e) {// call the NativeDll function in C ++. simple simple = new NativeDll. simple (); int result = simple. add (1, 1); lblMsg. text = "1 + 1 =" + result. toString ();}}}

Readme.txt

1. To use the C language, you need to select the corresponding. c file-> right-click-> properties-> c/c ++-> advanced-> compile as C ++ code (/TP) 2. For example, if you want to use strcpy, you will be warned in vs, asking you to use strcpy_s, but strcpy_s is owned by Microsoft. To remove this warning, you can do this:) define # define _ CRT_SECURE_NO_WARNINGS B at the beginning of the file) or use the following method once and for all: dll project-> right-click-> properties-> c/c ++-> pre-processor-> Add "_ CRT_SECURE_NO_WARNINGS" in "pre-processor definition" 3. debug the local code: select solution-> right-click-> properties-> debug-> debugger type-> select "hybrid (managed and local)" 4. How to Create c code, the default format is UTF-8: Modify the "hfile" template file in a directory similar to D: \ Program Files (x86) \ Microsoft Visual Studio 12.0 \ VC \ vcprojectitems. h and newc ++ file. cpp File Format: UTF-8

2. hello c
CHello. h

// C. h file // header file is generally used for placement: macro definitions to be exposed, global variable declaration, function declaration // prevent secondary compilation of the same file. For example, you have two c files, both of which include the same header file. during compilation, these two c files will be compiled together, the Declaration conflict problem occurs. # ifndef _ MYHEAD_HELLO _ // is the abbreviation of if not defined, if _ MYHEAD_HELLO _ is not defined, execute this section # define _ MYHEAD_HELLO _ // write the c language code in c ++ # ifdef _ cplusplus // If currently, the c ++ environment extern "C" // tells c ++ that the {} block is written in the c language code {# endif // function declaration char * demo_cHello (char * name ); # ifdef _ cplusplus // if the current environment is c ++} # endif/* // in windows, this can be abbreviated as # ifdef _ cplusplusextern "C" # endifchar * demo_cHello (char * name); */# endif/# ifndef _ MYHEAD_HELLO _

CHello. c

/** Hello c */# include "pch. h "// pre-compiled header file # include" cHello. h "// introduce the header file to be implemented # include" cHelper. h "// the header file char * demo_cHello (char * name) {return str_concat2 (" hello: ", name);} // This demo cannot demonstrate the main function, so here are some text descriptions about the main function. // The main function is an entry function and cannot be called by other functions. // assume that the command is: executable File name parameter 1 parameter 2 parameter 3int main (int argc, char * argv []) // The main function can also be return value without any parameters, that is: int main (void) {} or void main (void) {} can both be {// argc is the number of parameters; argv is the parameter value // argc-equals to 4 (note: "executable file name" is also a parameter) // argv [0]-executable file name; argv [1]-parameter 1; argv [2]-parameter 2; argv [3]-parameter 3 // return 0 indicates normal return 0 ;}

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