CB2010中，在new vcl component时，出现“Unresolved external 'Extctrls::TTime
如题,(新建一个元件时)，求大侠帮手，是否写法出错还是少了什么头文件等？
/* Component1.h */
//---------------------------------------
#ifndef Component1H
#define Component1H
//---------------------------------------
#include <SysUtils.hpp>
#include <Classes.hpp>
#include <sysdyn.h>
#include <extctrls.hpp>
//---------------------------------------
class PACKAGE My : public TComponent
{
private:
protected:
public:
TTimer *CommTimer; /* 添加的一个 定时器指针 */
__fastcall My(TComponent* Owner);
__published:
};
//---------------------------------------
#endif
/* Component1.cpp */
//---------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Component1.h"
#pragma package(smart_init)
static inline void ValidCtrCheck(My *)
{
new My(NULL);
}
//---------------------------------------
__fastcall My::My(TComponent* Owner)
: TComponent(Owner)
{
/* 如下3行 是添加的 */
CommTimer= new TTimer(this);
CommTimer->Enabled=false;
CommTimer->Interval =10;
}
//---------------------------------------
namespace Component1
{
void __fastcall PACKAGE Register()
{
TComponentClass classes[1] = {__classid(My)};
RegisterComponents(L"Samples", classes, 0);
}
}
//---------------------------------------
在选择Project->Builder All Projects 时，出现如下Error:
Checking project dependencies...
Building LeoPackage.cbproj (Debug configuration)
[ILINK32 Error] Error: Unresolved external 'Extctrls::TTimer::' referenced from C:\USERS\LEO\DOCUMENTS\RAD STUDIO\PROJECTS\DEBUG\COMPONENT1.OBJ
[ILINK32 Error] Error: Unresolved external '__fastcall Extctrls::TTimer::TTimer(Classes::TComponent *)' referenced from C:\USERS\LEO\DOCUMENTS\RAD STUDIO\PROJECTS\DEBUG\COMPONENT1.OBJ
[ILINK32 Error] Error: Unresolved external '__fastcall Extctrls::TTimer::SetEnabled(bool)' referenced from C:\USERS\LEO\DOCUMENTS\RAD STUDIO\PROJECTS\DEBUG\COMPONENT1.OBJ
[ILINK32 Error] Error: Unresolved external '__fastcall Extctrls::TTimer::SetInterval(unsigned int)' referenced from C:\USERS\LEO\DOCUMENTS\RAD STUDIO\PROJECTS\DEBUG\COMPONENT1.OBJ
[ILINK32 Error] Error: Unable to perform link
Failed
Elapsed time: 00:00:00.5
[解决办法]
这个错误不是找不到TTimer的声明，而是TTimer的实现部分没有找到。
将$(BCB)\lib\bcbsmp.bpi添加到工程中即可。
$(BCB)是指你的C++Builder安装目录。
