c++builder建立及调用dll

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1、C++Builder建立及调用DLLDLL简称动态链接库,是Windows中程序的重要组成部分。想象一下，一个程序需要多人共同完成开发，怎么个共同法？这时我们就要考虑把程序分为好几个模块，团队每一个成员开发一个模块。问题来了：如何将模块组合并成一个完整系统？还有，我们开发的软件需要不断升级，如何升级？难道每次非得把整个工程重新编译一次再发布给用户吗？解决这些问题的科学办法，就是开发动态链接库DLL。现在以开发myDLL.dll动态链接库为例，讲讲BCB中开发动态链接库的方法。1、新建立一个工程：File-New-Ot

2、her...在New卡中选择DLLWizard2、将工程存为myDLL.bpr3、在myDLL.cpp中写接口代码：////---------------------------------------------------------------------------#include#include#pragmahdrstop////------------------------------------------------------------------------

3、---////  ImportantnoteaboutDLLmemorymanagementwhenyourDLLusesthe////  staticversionoftheRunTimeLibrary:////////  IfyourDLLexportsanyfunctionsthatpassStringobjects(orstructs/////  classescontainingnestedStrings)asparameterorfunctionresults,////  youwillneedtoadd

4、thelibraryMEMMGR.LIBtoboththeDLLprojectand////  anyotherprojectsthatusetheDLL.YouwillalsoneedtouseMEMMGR.LIB////  ifanyotherprojectswhichusetheDLLwillbeperformingnewordelete////  operationsonanynon-TObject-derivedclasseswhichareexportedfromthe////  DLL.AddingME

5、MMGR.LIBtoyourprojectwillchangetheDLLanditscalling////  EXE'stousetheBORLNDMM.DLLastheirmemorymanager.Inthesecases,////  thefileBORLNDMM.DLLshouldbedeployedalongwithyourDLL.////////  ToavoidusingBORLNDMM.DLL,passstringinformationusing"char*"or////  ShortStringp

6、arameters.////////  IfyourDLLusesthedynamicversionoftheRTL,youdonotneedto////  explicitlyaddMEMMGR.LIBasthiswillbedoneimplicitlyforyou////---------------------------------------------------------------------------extern"C"__declspec(dllexport)__stdcallintmyAdd(

7、int,int);extern"C"__declspec(dllexport)__stdcallAnsiStringaboutMe(void);intadd(intn1,intn2);#pragmaargsusedintWINAPIDllEntryPoint(HINSTANCEhinst,unsignedlongreason,void*lpReserved){       return1;}////------------------------------------------------------------

8、---------------__declspec(dllexport)__stdcallintmyAdd(intn1,intn2){intT;T=add(n1,n2);returnT;}intadd(intn1,intn2){returnn1+n2;}__declspec(dllexport)__stdcallAnsiStringaboutM