文件复制过程中显示进度条(九)

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文件复制过程中显示进度条(九)

本文讲述如何在文件复制过程中显示进度条。

1. 创建一个对话框工程：CopyFileProcessor

2. 添加一个文本框，用来显示浏览出来的源文件路径，添加一个按钮“浏览”，来选择源文件，如下：

CFileDialoglog(TRUE,"文件","*.*",OFN_HIDEREADONLY,"FILE(*.*)|*.*||",NULL);

if(log.DoModal()==IDOK)

{

pathname=log.GetPathName();

strname=log.GetFileName();

GetDlgItem(IDC_EDADD)->SetWindowText(pathname);

}

3. 添加一个文本框来显示浏览出来的目标存放路径，添加一个按钮“浏览”，来选择目标存放路径，如下：

if(strname.IsEmpty())

return;

BROWSEINFObi;

charbuffer[MAX_PATH];

ZeroMemory(buffer,MAX_PATH);

bi.hwndOwner=GetSafeHwnd();

bi.pidlRoot=NULL;

bi.pszDisplayName=buffer;

bi.lpszTitle="选择一个文件夹";

bi.ulFlags=BIF_EDITBOX;

bi.lpfn=NULL;

bi.lParam=0;

bi.iImage=0;

LPITEMIDLISTpList=NULL;

if((pList=SHBrowseForFolder(&bi))!=NULL)

{

charpath[MAX_PATH];

ZeroMemory(path,MAX_PATH);

SHGetPathFromIDList(pList,path);

fullname=path;

if(fullname.Right(1)!="//")

fullname.Format("%s//%s",path,strname);

else

fullname.Format("%s%s",path,strname);

GetDlgItem(IDC_EDDEST)->SetWindowText(fullname);

}

4. 添加一个进度条控件，添加一个按钮“复制”，代码如下：

if(pathname.IsEmpty())

return;

if(fullname.IsEmpty())

return;

readfile = newCFile(pathname,CFile::modeRead);

HANDLEhfile = ::CreateFile(fullname,GENERIC_WRITE|GENERIC_READ,0,0,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,0);

CloseHandle(hfile);

writefile = newCFile(fullname,CFile::modeWrite);

filelen = readfile->GetLength();

ldiv_tr;

r = ldiv(filelen,100);

longpos = r.quot;

longipos;

ipos = pos;

inti = 0;

hGlobal = GlobalAlloc(GMEM_MOVEABLE,512);

pvData = GlobalLock(hGlobal);

while(1)

{

ZeroMemory(pvData,512);

readlen = readfile->ReadHuge(pvData,512);

poslen = readfile->GetPosition();

if(poslen>ipos)

{

ipos += pos;

i++;

}

m_fileproc.SetPos(i);

m_fileproc.Invalidate();

writefile->WriteHuge(pvData,readlen);

if(poslen == filelen)

break;

}

AfxMessageBox("复制完成");

m_fileproc.SetPos(0);

GlobalUnlock(hGlobal);

readfile->Close();

writefile->Close();

注意，其中有些变量的声明如下：

CStringstrname;

CStringfullname;

CStringpathname;

HGLOBALhGlobal;

CFile* writefile;

CFile* readfile;

longreadlen,poslen,filelen;

LPVOIDpvData;

并在构造函数中初始化，如下：

readfile = NULL;

writefile = NULL;

pvData = NULL;

完成。