终于在TreeView里加进了背景！！！

2003-01-25 10:39:39 127 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

基于车牌识别的停车收费系统的设计与实现(源码+开题) 本系统（程序源码）带文档lw万字以上文末可获取一份本项目的java源码和数据库参考。系统程序文件列表开题报告内容研究背景：随着城市化进程的加速和汽车保有量的增加，停车难成为了一个普遍存在的问题。传统的停车收费方式存在着效率低下、管理混乱等问题。因此，开发一款基于车牌识别的停车收费系统具有重要的现实意义。研究意义：基于车牌识别的停车收费系统可以有效地解决传统停车收费方式在效率和准确性方面的问题，提高停车服务的效率和质量。阅读详情

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
Graphics::TBitmap *bmp;
TWndMethod ms;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
bmp=new Graphics::TBitmap();
bmp->LoadFromFile("E:\\Gif\\071_03.BMP");
TV->Canvas->Brush->Bitmap=bmp;
ms=TV->WindowProc;
TV->WindowProc=proc;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::proc(TMessage &msg)
{
if(msg.Msg==WM_ERASEBKGND) return;
if(msg.Msg==WM_PAINT)
{
TRect ARect=TV->ClientRect;
int W=ARect.Width();
int H=ARect.Height();

HDC memdc=CreateCompatibleDC(TV->Canvas->Handle);
HBITMAP membmp=CreateCompatibleBitmap(TV->Canvas->Handle,W,H);
SelectObject(memdc,membmp);
ms(msg);
BitBlt(memdc,0,0,W,H,TV->Canvas->Handle,0,0,SRCCOPY);

HDC maskdc=CreateCompatibleDC(TV->Canvas->Handle);
HBITMAP maskbmp=CreateBitmap(W,H,1,1,NULL);
SelectObject(maskdc,maskbmp);
BitBlt(maskdc,0,0,W,H,memdc,0,0,SRCCOPY);

TV->Canvas->FillRect(ARect);

SetBkColor(memdc,RGB(0,0,0));
SetTextColor(memdc,RGB(255,255,255));
BitBlt(memdc,0,0,W,H,maskdc,0,0,SRCAND);

SetBkColor(TV->Canvas->Handle,RGB(255,255,255));
SetTextColor(TV->Canvas->Handle,RGB(0,0,0));

BitBlt(TV->Canvas->Handle,0,0,W,H,maskdc,0,0,SRCAND);
BitBlt(TV->Canvas->Handle,0,0,W,H,memdc,0,0,SRCPAINT);

DeleteObject(memdc);
DeleteObject(membmp);
DeleteObject(maskdc);
DeleteObject(maskbmp);
}
else
ms(msg);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
delete bmp;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::TVExpanded(TObject *Sender, TTreeNode *Node)
{
TV->Repaint();
}
//---------------------------------------------------------------------------

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