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Pipe is a worm hole connecting C and C++

In C programming language, the observer design pattern is implemented with function pointer (aka callback function). But in Qt library, it introduces signal and slot. How to link a callback function from the C callback function to the C++ siganl and slot is a problem I encounter. Call back function can only be static, but signal and slot can not. There are some triky way to pretend a non-static function to a static function. But the easiest way is to use pipe. the callback function create a pipe and do the read operation, while the siganl function wait for and read at the other end of the pipe.
The pipe is like a worm hole connecting C and C++, two different time and space. How cool! ......

Pipe is a worm hole connecting C and C++

In C programming language, the observer design pattern is implemented with function pointer (aka callback function). But in Qt library, it introduces signal and slot. How to link a callback function from the C callback function to the C++ siganl and slot is a problem I encounter. Call back function can only be static, but signal and slot can not. There are some triky way to pretend a non-static function to a static function. But the easiest way is to use pipe. the callback function create a pipe and do the read operation, while the siganl function wait for and read at the other end of the pipe.
The pipe is like a worm hole connecting C and C++, two different time and space. How cool! ......

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¡¡¡¡const int n = 5;
¡¡¡¡int a[n];
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Java¿çƽ̨µÄÌØÐÔʹJavaÔ½À´Ô½ÊÜ¿ª·¢ÈËÔ±µÄ»¶Ó­£¬µ«Ò²ÍùÍù»áÌýµ½²»Éٵı§Ô¹£ºÓÃJava¿ª·¢µÄͼÐÎÓû§´°¿Ú½çÃæÃ¿´ÎÔÚÆô¶¯µÄʱºò¶¼»áÌø³öÒ»¸ö¿ØÖÆÌ¨´°¿Ú£¬Õâ¸ö¿ØÖÆÌ¨´°¿ÚÈñ¾À´·Ç³£°ôµÄ½çÃæÊ§É«²»ÉÙ¡£ÔõôÄܹ»ÈÃͨ¹ýJava¿ª·¢µÄGUI³ÌÐò²»µ¯³öJavaµÄ¿ØÖÆÌ¨´°¿ÚÄØ£¿ÆäʵÏÖÔںܶàÁ÷ÐеĿª·¢»·¾³ÀýÈçJBuilder¡¢Eclipse¶¼ÊÇʹÓô¿Java¿ª·¢µÄ¼¯³É»·¾³¡£ÕâЩ¼¯³É»·¾³Æô¶¯µÄʱºò²¢²»»á´ò¿ªÒ»¸öÃüÁî´°¿Ú£¬ÒòΪËüʹÓÃÁËJNI£¨Java Native Interface£©µÄ¼¼Êõ¡£Í¨¹ýÕâÖÖ¼¼Êõ£¬¿ª·¢ÈËÔ±²»Ò»¶¨ÒªÓÃÃüÁîÐÐÀ´Æô¶¯Java³ÌÐò£¬¿ÉÒÔͨ¹ý±àдһ¸ö±¾µØGUI³ÌÐòÖ±½ÓÆô¶¯Java³ÌÐò£¬ÕâÑù¾Í¿É±ÜÃâÁíÍâ´ò¿ªÒ»¸öÃüÁî´°¿Ú£¬Èÿª·¢µÄJava³ÌÐò¸ü¼Óרҵ¡£
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Excel writing and reading with pure c API

Reading and Writing Excel file with pure C api in windows system. tested on windows 2000, hope it can help you:
#ifndef _WINXLS_H_
#define _WINXLS_H_
/*============================================================================*
*      Include Files
*============================================================================*/
#include <windows.h>
#include <Oleauto.h>    /* SysAllocString */
#include <objbase.h>    /* CoCreateInstance, ... */
#pragma comment(lib, "ole32.lib")
#include "mytypes.h"    /* tInt32, ...        */
#include "mydll.h"    /* define EXPORT     */
/*============================================================================*
*    define/typedef/struct
*============================================================================*/
#define DISP_CELL &nbs ......
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