怎样在目录中寻找文件

下面的代码说明了怎样在一个给定的目录中从上到下地搜索整个目录树.本例子只将结果输出到system debug screen.

调用下面的类函数,搜索完成之后,将出现一个信息框.

void CTestView::OnSearch()
{

// szFilename is declared in the header as array of char
// look for MyFile.txt (or whatever)

strcpy(szFilename,”MyFile.txt”);

// go to root directory (or to whichever directory that you wish)

_chdir(“C:\\”);

// search for the filename

SearchDirectory();

// announce when done

MessageBox(“Done Searching”);
}

函数 SearchDirectory() 在函数 OnSearch()中被调用. SearchDirectory() 然后反复回调,直到整个目录,包括子目录都被搜索.

void CTestView::SearchDirectory()
{
struct _finddata_t filestruct;
long hnd;
char buffer[_MAX_PATH];

// set _findfirst to find everthing

hnd = _findfirst(“*”,&filestruct);

// if handle fails, drive is empty…

if((hnd == -1)) return;

// get first entity on drive – check if it’s a directory

if(::GetFileAttributes(filestruct.name) & FILE_ATTRIBUTE_DIRECTORY
&& !(::GetFileAttributes(filestruct.name) & FILE_ATTRIBUTE_HIDDEN)) {

// if so, change to that directory and recursively call SearchDirectory

if(*filestruct.name != ‘.’) {

_chdir(filestruct.name);

SearchDirectory();

// go back up one directory level

_chdir(“..”);
}
}
else {

// if it’s not a directory and it matches what you want…

if(!stricmp(filestruct.name,szFilename)) {

// output the filename with path to debugger

_getcwd(buffer,_MAX_PATH);
strcat(buffer,”\\”);
strcat(buffer,filestruct.name);
strcat(buffer,”\r\n”);
OutputDebugString(buffer);
}
}

while(!(_findnext(hnd,&filestruct))) {

if(::GetFileAttributes(filestruct.name) & FILE_ATTRIBUTE_DIRECTORY
&& !(::GetFileAttributes(filestruct.name) & FILE_ATTRIBUTE_HIDDEN)) {

if(*filestruct.name != ‘.’) {
_chdir(filestruct.name);

SearchDirectory();

_chdir(“..”);
}
}
else {

if(!stricmp(filestruct.name,szFilename)) {
_getcwd(buffer,_MAX_PATH);
strcat(buffer,”\\”);
strcat(buffer,filestruct.name);
strcat(buffer,”\r\n”);
OutputDebugString(buffer);
}
}
}

_findclose(hnd);
}