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C language Standardin 1978, Dennis Ritchie (Dennis Ritchie) and Brian Kernighan published the first edition of the "C programming language". The C language standard described in the book is also called "Kr C" by C language programmers, and the second edition contains some ANSI C standards. Kr c mainly introduces the following features:Structure (struct) typeLong int typeunsigned integer (unsigned int) typeChange the operator =+ and =-to + = and =. Bec

these data types.# Include For example:Long L = 222;Ing I = 100;_ Variant_t lval (L );Lval = (long) I; The use of colevariant is basically the same as that of the _ variant_t method. See the following example:Colevariant V3 = "string", V4 = (long) 1999;Cstring STR = (BSTR) v3.pbstrval;Long I = v4.lval; 6. Other COM Data Types Obtain CLSID Based on progidHresult clsidfromprogid (lpcolestr lpszprogid, lpclsid pclsid );CLSID;Clsidfromprogid (L "mapi. folder", CLSID ); Obtain th

/binyun#path% Now, we use the following command: C:/IL> ilasm/nologo/quiet a. Il This will generate the following error: Source file is ANSI Error: No entry point declared for executable * ***** Failure ***** In the future, we will not display the first and last lines of output generated by ilasm. We will also remove blank rows between non-blank rows. In Il, we can use periods. as the beginning of a line. This is an instruction that requires the compi

　I. BSTR, lpstr, and lpwstrIn all programming methods of Visual C ++. net, we often use such basic string types, such as BSTR, lpstr, and lpwstr. These data types are similar to the above because of data exchange between different programming languages and support for ANSI, Unicode, and multi-byte character sets (MBCS.So What Are BSTR, lpstr, and lpwstr?BSTR (Basic string, basic string) is a unicode string of the olechar * type. It is described as a T

Document directory 1. Run-Time Library 2. Common compilation Parameters 3. subsystem and executable file startup 4. Do not display the console program in the console window 5. MFC library files 6. Resolution of default library conflicts in VC In the same title, the content of the two articles is slightly different, so I will combine them. The following content is from: Http://blog.163.com/bestfighter_210@126/blog/static/10361887200811206310788/ Http://demon.tw/programming/vc-compile-sk

function in C ++:Int function (void){Return 1;} The following call is invalid:Function (2 ); In C ++, the function parameter void means that this function does not accept any parameters. We compile in Turbo C 2.0:# I nclude "stdio. H"Fun (){Return 1;}Main (){Printf ("% d", fun (2 ));Getchar ();} Compiling is correct and 1 is output. In C, parameters of any type can be transferred to a function without parameters. However, compiling the same code in C ++ compiler will cause an error. In C ++, no

1. Differences among wchar_t, Char, and wchar ANSI: Char. Available string processing functions: strcat (), strcpy (), strlen (), and other functions with str headers. UNICODE: wchar_t is the data type of Unicode characters. It is actually defined in: Typedef unsigned short wchar_t; In addition, the header file has the following definition: typedef wchar_t wchar; so wchar is actually wchar_t Wchar_t can be used as a string processing function: wcscat

2.6.5. ANSI character encoding and Windows 1252In order to support English and Western European characters, Windows designed a code that corresponds to the code page number 1252, which is called Windows 1252.The design of Windows 1252 is a reference to the ANSI draft (ANSI Draft).The ANSI draft later developed into a f

feature are as follows:1. CallingConvention indicates the CallingConvention value used when passing method parameters to an unmanaged implementation.CALLINGCONVENTION.CDECL: The caller cleans up the stack. It enables you to invoke a function that has varargs.Callingconvention.stdcall: The callee cleans up the stack. It is frommanagedCode calls the default convention for unmanaged functions.2. CharSet controls the name version of the calling function and indicates how to marshal the String param

declaration is added. 　　The code's "self-explanatory" code can annotate itself. Rule two if the function has no arguments, declare that its argument is void in C++the language declares a function like this:intfunctionvoid){return 1;} It is not legal to make the following call: function (2); Because in C++, the function parameter is void meaning that the function does not accept any arguments. We're in Turbo C .2. 0 Compilation: #i nclude'stdio.h'Fun () {return 1;} Main () {printf ('%d', Fun (2)

few use four bytes.iso8859-1: (The Comrades who use Oracle may have seen this we8iso89859p1, yes, it is.) ）ü iso8859-1 Character set : ASCII character set + several Western European characters, such as Letter Â, E.ü iso8859-1 encoding : Use 8 bits to represent one character, and remove the control (i.e. [0-31], and 127) from the original ASCII encoding.code page: (You can think of "code page" as a synonym for "coding".) Why does it have this name? Problems left over from history. ）ü

. We compile in Turbo C 2.0: #include"stdio.h" fun() { return1; } main() { printf("%d",fun(2)); getchar(); } Compiling is correct and 1 is output. In C, parameters of any type can be transferred to a function without parameters. However, compiling the same code in C ++ compiler will cause an error. In C ++, no parameters can be transferred to a function without parameters. If an error occurs, the system prompts "'fun ': function does not take 1 parameters ". T

www.2cto.comAccording to the ANSI (American National Standards Institute) standard, you cannot perform algorithm operations on the void pointer, that is, the following operations are invalid:Void * pvoid;Pvoid ++; // ANSI: ErrorPvoid + = 1; // ANSI: Error// The ANSI standard determines this because it insists that the

C + +, if the function does not accept any arguments, be sure to indicate that the argument is void.Rule three: Be careful with the void pointer typeBy the ANSI (American National standards Institute) standard, you cannot perform algorithmic operations on void pointers, that is, the following operations are not valid:void * PVOID;pvoid++; ANSI: ErrorPVOID + = 1; ANSI