我想寫ㄧ個利用hook function跟GrabContinuous連續抓圖的程式，
程式如下
[code cpp]
//---------------------------------------------------------------------------
#include
#pragma hdrstop
#include
#include
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
Graphics::TBitmap *photo;
long xsize=640,ysize=480,data=0;
MIL_ID MilApplication, /* Application identifier. */
MilSystem, /* System identifier. */
MilDisplay, /* Display identifier. */
MilDigitizer, /* Digitizer identifier. */
MilImage, /* Image buffer identifier. */
ImageBuffer[10];
typedef volatile struct
{
MIL_ID *MilImage;
MIL_ID MilDigitizer;
MIL_ID GrabEndEvent;
long NbGrabStart;
long NbGrabEnd;
double Time;
} UserDataStruct;
UserDataStruct UserStruct;
int picture=0;
int i=0;
//--------------------------------------------------------
long MFTYPE FrameOneGrabEnd(long HookType, MIL_ID EventId, void MPTYPE *UserStructPtr)
{
int x,y;
unsigned char buf1[480][640];
Graphics::TBitmap *photo;
Byte *data;
MbufGet2d(MilImage,0L,0L,640L,480L,buf1);
for(y=0;y <=480;y )
{data=(Byte *)photo->ScanLine[y];
for(x=0;x<=640*3;x =3)
{
data[x]=buf1[y][x/3];
data[x 1]=buf1[y][x/3] ;
data[x 2] =buf1[y][x/3] ;
}
}
Image1->Picture->Assign(photo);
return 0;
}
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{ //extern PACKAGE TWinControl* __fastcall FindControl(HWND Handle); //開啟HWND
//Timer1->Enabled=true;
Graphics::TBitmap *photo=Image1->Picture->Bitmap;
photo->PixelFormat=pf24bit;
/* Allocate defaults.連線配置區 */
MappAlloc(M_SETUP,&MilApplication);
MsysAlloc(M_SYSTEM_CRONOSPLUS,M_DEFAULT,M_DEFAULT,&MilSystem);
MdigAlloc(MilSystem,M_DEFAULT,"Rs170.DCF",M_DEFAULT,&MilDigitizer);
MdispAlloc(MilSystem,M_DEFAULT,"M_DEFAULT",M_DEFAULT,&MilDisplay);
MbufAlloc2d(MilSystem,xsize,ysize,8 M_UNSIGNED,M_IMAGE M_DISP M_GRAB M_PROC,&MilImage);
/*for(i=0;i>9;i )
{MbufAlloc2d(MilSystem,xsize,ysize,8 M_UNSIGNED,M_IMAGE M_DISP M_GRAB M_PROC,&MilImage);
}*/
MdigHookFunction(MilDigitizer,M_GRAB_FRAME_END,FrameOneGrabEnd,(void *)(&UserStruct));
//MdispSelectWindow(MilDisplay,MilImage,Handle); //選擇HANDLE開啟錄影
//MdispSelect(MilDisplay,MilImage);
//MdigGrab(MilDigitizer, MilImage); //拍照 放入MilImage
MdigGrabContinuous(MilDigitizer, MilImage); /*攝影*/
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
//Timer1->Enabled=false;
//清除影像配置
MappFreeDefault(MilApplication, MilSystem, MilDisplay,MilDigitizer, MilImage);
MdigHookFunction(MilDigitizer, M_GRAB_FRAME_END M_UNHOOK, FrameOneGrabEnd, (void *)(&UserStruct));
}
//---------------------------------------------------------------------------
[/code]

但在compile時會顯示下面錯誤：
[C Error] Unit1.cpp(50): E2451 Undefined symbol 'Image1'
錯誤發生在FrameOneGrabEnd 這個函式裡面。
是因為在我自己寫的function裡面不能用Object嗎?
請各位大大幫幫忙....感謝<(_ _)>

編輯記錄

因為 FrameOneGrabEnd 的 Function 不是屬於 Form1

所以不能直接存取Image1



方法一:

把 Image1->Picture->Assign(photo); 改成 Form1->Image1->Picture->Assign(photo);

讓程式知道你要存取Form1的Image1元件



方法二:

把 Function 加入 Form1

.h 中

[code cpp]

long MFTYPE FrameOneGrabEnd(long HookType, MIL_ID EventId, void MPTYPE *UserStructPtr);

移到Form1的Public Class裡面，並且改成

long MFTYPE __fastcall FrameOneGrabEnd(long HookType, MIL_ID EventId, void MPTYPE *UserStructPtr);

[/code]



.cpp 中

[code cpp]

long MFTYPE FrameOneGrabEnd(long HookType, MIL_ID EventId, void MPTYPE *UserStructPtr)

改成

long MFTYPE __fastcall Form1::FrameOneGrabEnd(long HookType, MIL_ID EventId, void MPTYPE *UserStructPtr)

[/code]

編輯記錄

我用方法一解決了，
原來只是個基本的問題...
非常謝謝daldal大大的回答!!