我是想要將用vfw所擷取的影像秀在Image1上,參考了前輩的做法,但是不行...是不是還缺少什麼呢?? //---------------------------------------------------------------------------    #include  #pragma hdrstop #include "Unit1.h" #include "vfw.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; //--------------------------------------------------------------------------- LPVIDEOHDR VideoStr; HWND ghCapWnd; __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { int i; String msg=""; capCreateCaptureWindow("My Capture Window", WS_CHILD | WS_VISIBLE,0, 0,352,288,ghCapWnd, 0); //³]©wCaptureWindows Panel1->Width=352; Panel1->Height=288; i=int(capDriverConnect (ghCapWnd, 0)); //»PÅX°Êµ{¦¡³sµ² if (i==1) msg="webcam ¤w³s½u!!"; else msg="webcam³s½u¥¢±Ñ!!"; ShowMessage(msg); } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { capPreview(ghCapWnd,true); //§ì¨ú¼v¹³¥X²{¦bµøµ¡¤¤ capPreviewScale(ghCapWnd,true); //¨Ï¼v¹³©µ¦ù¨ì©Ò³]©wªºµøµ¡¤j¤p capPreviewRate(ghCapWnd, 1000/30); //¨C¬í¼v¹³ÅܤƱi¼Æ } //--------------------------------------------------------------------------- void __fastcall TForm1::Button2Click(TObject *Sender) { String msg2="WebCam¤w°±¤îÂ^¨ú!!"; capPreview(ghCapWnd,false); ShowMessage(msg2); Close(); } //--------------------------------------------------------------------------- void __fastcall TForm1::Button3Click(TObject *Sender) { capSetCallbackOnFrame (ghCapWnd, &FrameCallBack); } //--------------------------------------------------------------------------- LRESULT CALLBACK FrameCallBack( HWND hwnd, Longint lpvhdr ) { static BITMAPINFOHEADER BitmapHead; static BITMAPINFO BitmapInfo; static BITMAPFILEHEADER BitmapFileHead; CAPSTATUS status; int BIHsize, byte; Byte *ptr; TMemoryStream *stream = new TMemoryStream; VideoStr=LPVIDEOHDR(lpvhdr); capGetStatus( ghCapWnd, &status, sizeof(status) ) ; BIHsize=capGetVideoFormatSize( ghCapWnd ); capGetVideoFormat( ghCapWnd, &BitmapHead, BIHsize); BitmapInfo.bmiHeader=BitmapHead; stream->Size=sizeof(BitmapFileHead) sizeof(BitmapHead) BitmapHead.biSizeImage; BitmapFileHead.bfType=0x4D42; BitmapFileHead.bfSize=stream->Size; BitmapFileHead.bfOffBits=sizeof(BitmapFileHead) sizeof(BitmapHead); // ???imagedata?? stream->Position=0; stream->WriteBuffer( &BitmapFileHead, sizeof(BitmapFileHead) ); stream->WriteBuffer( &BitmapInfo, sizeof(BitmapInfo) ); (void*)ptr=stream->Memory; ptr = BitmapFileHead.bfOffBits; Move( VideoStr->lpData, ptr, BitmapHead.biSizeImage); stream->Position=0; Form1->Image1->Picture->Bitmap->LoadFromStream( stream ); delete( stream ); capSetCallbackOnFrame (ghCapWnd, NULL); return(0); } 編譯後會出現: [C Error] Unit1.cpp(50): E2451 Undefined symbol 'FrameCallBack' 是什麼原因呢?? 或是有提供vfw擷取影像至Image1的程式可以下載來參考??(之前看有些網友說可以下載的到??)

你少加一個定義,麻煩你在TForm1 *Form1;底下再加以下這一組: LRESULT CALLBACK FrameCallBack(HWND,Longint);//宣告callbackonframe函式    這樣應該就沒問題了!! 寒窗苦讀十年書；只待今朝狀元時！~~ ︵ / / ︵ ( ∩ ∩ ) ○ ︶ ○

------
Keni Lin

//---------------------------------------------------------------------------    #include  #pragma hdrstop #include "Unit2.h" #include "vfw.h" //--------------------------------------------------------------------------- #pragma package(smart_init) #pragma resource "*.dfm" TForm1 *Form1; LRESULT CALLBACK FrameCallBack(HWND,Longint);//«Å§icallbackonframe¨ç¦¡ //--------------------------------------------------------------------------- LPVIDEOHDR VideoStr; HWND ghCapWnd; __fastcall TForm1::TForm1(TComponent* Owner) : TForm(Owner) { int i; String msg=""; hCapWnd=capCreateCaptureWindow("My Capture Window", WS_CHILD | WS_VISIBLE,0, 0,352,288,ghCapWnd, 0); //³]©wCaptureWindows i=int(capDriverConnect (ghCapWnd, 0)); //»PÅX°Êµ{¦¡³sµ² if (i=1) msg="webcam ¤w³s½u!!"; else msg="webcam³s½u¥¢±Ñ!!"; ShowMessage(msg); } //--------------------------------------------------------------------------- void __fastcall TForm1::Button1Click(TObject *Sender) { capPreview(ghCapWnd,true); //§ì¨ú¼v¹³¥X²{¦bµøµ¡¤¤ FrameCallBack(ghCapWnd,1000); capPreviewScale(ghCapWnd,true); //¨Ï¼v¹³©µ¦ù¨ì©Ò³]©wªºµøµ¡¤j¤p capPreviewRate(ghCapWnd, 1000/30); //¨C¬í¼v¹³ÅܤƱi¼Æ } //--------------------------------------------------------------------------- void __fastcall TForm1::Button2Click(TObject *Sender) { String msg2="WebCam¤w°±¤îÂ^¨ú!!"; capPreview(ghCapWnd,false); ShowMessage(msg2); Close(); } //--------------------------------------------------------------------------- LRESULT CALLBACK FrameCallBack( HWND hwnd, Longint lpvhdr ) { static BITMAPINFOHEADER BitmapHead; static BITMAPINFO BitmapInfo; static BITMAPFILEHEADER BitmapFileHead; CAPSTATUS status; int BIHsize, byte; Byte *ptr; TMemoryStream *stream = new TMemoryStream; VideoStr=LPVIDEOHDR(lpvhdr); capGetStatus( ghCapWnd, &status, sizeof(status) ) ; BIHsize=capGetVideoFormatSize( ghCapWnd ); capGetVideoFormat( ghCapWnd, &BitmapHead, BIHsize); BitmapInfo.bmiHeader=BitmapHead; stream->Size=sizeof(BitmapFileHead) sizeof(BitmapHead) BitmapHead.biSizeImage; BitmapFileHead.bfType=0x4D42; BitmapFileHead.bfSize=stream->Size; BitmapFileHead.bfOffBits=sizeof(BitmapFileHead) sizeof(BitmapHead); // ???imagedata?? stream->Position=0; stream->WriteBuffer( &BitmapFileHead, sizeof(BitmapFileHead) ); stream->WriteBuffer( &BitmapInfo, sizeof(BitmapInfo) ); (void*)ptr=stream->Memory; ptr = BitmapFileHead.bfOffBits; Move( VideoStr->lpData, ptr, BitmapHead.biSizeImage); stream->Position=0; Form1->Image1->Picture->Bitmap->LoadFromStream( stream ); delete( stream ); capSetCallbackOnFrame (ghCapWnd, NULL); return(0); } 加上函數的宣告後,就可以執行了....但是當我按下button1要執行影像擷取時,會出現有關memory的錯誤,我想是不是函式呼叫的參數數入錯誤了?? 另外我想請教,"LRESULT CALLBACK"是什麼樣的資料型態??什麼時候可以用??

"LRESULT CALLBACK"主要是定義長變數&FrameCallBack,當然是做影像擷取時使用! 我注意一下你的程式,雖然和你同樣用> #> #> //--------------------------------------------------------------------------- #>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

------
Keni Lin

KENI LIN大大....真的太感謝您了....我會試試看的...若有不了解 的地方,還希望您能不吝賜教!!!

引言: "LRESULT CALLBACK"主要是定義長變數&FrameCallBack,當然是做影像擷取時使用! 我注意一下你的程式,雖然和你同樣用> #> #> //--------------------------------------------------------------------------- #>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>< face="Verdana, Arial, Helvetica"> 你好，我執行button4功能時會出錯，請問這是什麼原因？謝謝你的答覆。 發表人 - wccheng 於 2005/06/12 03:54:46 發表人 - wccheng 於 2005/06/12 03:56:07