C++builder 图像字符流的存储和加载

__fastcall TForm6::TForm6(TComponent* Owner)
    : TForm(Owner)
{
#if 1          //for debug
    AllocConsole();
    AttachConsole( GetCurrentProcessId() ) ;
    freopen( "CON", "w", stdout ) ;
#endif
    Image1->Picture->LoadFromFile("HeadImage-UI/Photo-001.bmp");
    strcpy(text,"图片信息.a");
}
//---------------------------------------------------------------------------
void __fastcall TForm6::LoadImageClick(TObject *Sender)
{

    String strFileName = "123.bat";
    //打开或创建目标文件
    int nFileHandle;
    if(FileExists(strFileName))
        nFileHandle = FileOpen(strFileName,fmOpenWrite);
    else
        nFileHandle = FileCreate(strFileName);

    //定位到文件头
    FileSeek(nFileHandle,0x0,0);

    //把Image中的位图存入流中
    TMemoryStream *ms = new TMemoryStream;
    Image1->Picture->Bitmap->SaveToStream(ms);

    //先把图片流的大小写入文件中
    DWORD dw = ms->Size;
    FileWrite(nFileHandle,&dw,sizeof(dw));
    //再把图片流吸入文件中
    FileWrite(nFileHandle,ms->Memory,ms->Size);
    //接着写入Edit文本的长度
    dw = strlen(text);
    cout<<dw<<endl;
    FileWrite(nFileHandle,&dw,sizeof(dw));
    //再把Edit的文本写入文件
    FileWrite(nFileHandle,text,dw);

    delete ms;
    FileClose(nFileHandle);

    Image1->Picture->Assign(NULL);
    Edit1->Clear();

}
//---------------------------------------------------------------------------
void __fastcall TForm6::ShowImageClick(TObject *Sender)
{
    String strFileName = "123.bat";
    //打开图片流文件
    int nFileHandle;
    if(FileExists(strFileName))
        nFileHandle = FileOpen(strFileName,fmOpenRead);
    else
    {
        ShowMessage("File not find");
        return;
    }
    //定位到文件头
    FileSeek(nFileHandle,0x0,0);
    //先读取图像流的大小
    DWORD dw;
    FileRead(nFileHandle,&dw,sizeof(dw));
    //根据图像流的大小，从文件中读取图像流
    TMemoryStream *ms = new TMemoryStream;
    byte *p = new byte[dw];
    FileRead(nFileHandle,p,dw);
    ms->Write(p,dw);
    delete p;

    //把图像流中的位图显示到Image上面
    ms->Position = 0;
    Image1->Picture->Bitmap->LoadFromStream(ms);
    //接着读取文本长度
    FileRead(nFileHandle,&dw,sizeof(dw));

    //然后把指定长度的内容写到Edit中
    char *str = new char[dw*2];
    FileRead(nFileHandle,str,dw);
    str[dw]=0x0;
    Edit1->Text = str;
    cout<< dw <<endl;
    delete str;
    delete ms;
}
//---------------------------------------------------------------------------

原文链接: https://www.cnblogs.com/mypsq/p/5109321.html

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