【C++ Builder 11】选择文件夹的三种方式

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• 一、如何选择文件夹？
• 二、使用步骤
• • 1.浏览模式
  • 2.选择模式
  • 3.多选模式
• 三、完整代码

RAD C++ Builder 通过SelectDirectory函数实现。

代码如下（示例）：

void __fastcall TForm1::Button1Click(TObject *Sender)
{

	UnicodeString uniSDir;
	if (SelectDirectory(uniSDir, TSelectDirOpts() << sdAllowCreate << sdPerformCreate << sdPrompt, 0))//需要Vcl.FileCtrl.hpp文件定义支持
	{
		this->Edit1->Text = uniSDir;
	}
}

效果图：

代码如下（示例）：

void __fastcall TForm1::Button2Click(TObject *Sender)
{
	UnicodeString uniSDir;
	if(SelectDirectory(L"请选择文件夹的位置", L"", uniSDir, TSelectDirExtOpts() << TSelectDirExtOpt::sdNewUI << TSelectDirExtOpt::sdNewFolder << TSelectDirExtOpt::sdShowEdit, this))
	{
		this->Edit2->Text = uniSDir;
	}
}

效果图：

代码如下（示例）：

void __fastcall TForm1::Button3Click(TObject *Sender)
{
	DynamicArray uniSDirectories;
	if(SelectDirectory(L"", uniSDirectories, TSelectDirFileDlgOpts() << sdAllowMultiselect, L"请选择文件夹的位置", L"文件夹名字", L"选择文件夹"))
    {
		UnicodeString uniSDir = L"多选文件夹为：";
		for(int i=0; i
			uniSDir += L"rn" + uniSDirectories[i];
        }
		this->Memo1->Lines->Add(uniSDir);
	}
}

效果图：

unit1.h：

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

#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
//---------------------------------------------------------------------------
class TForm1 : public TForm
{
__published:	// IDE-managed Components
	TPanel *Panel2;
	TButton *Button1;
	TButton *Button2;
	TButton *Button3;
	TEdit *Edit1;
	TEdit *Edit2;
	TMemo *Memo1;
	TLabel *Label1;
	void __fastcall Button1Click(TObject *Sender);
	void __fastcall Button2Click(TObject *Sender);
	void __fastcall Button3Click(TObject *Sender);
	void __fastcall FormCreate(TObject *Sender);
private:	// User declarations
public:		// User declarations
	__fastcall TForm1(TComponent* Owner);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

unit1.cpp：

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

#include 
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
	: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
	UnicodeString uniSDir;
	if (SelectDirectory(uniSDir, TSelectDirOpts() << sdAllowCreate << sdPerformCreate << sdPrompt, 0))//需要Vcl.FileCtrl.hpp文件定义支持
	{
		this->Edit1->Text = uniSDir;
	}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
	UnicodeString uniSDir;
	if(SelectDirectory(L"请选择文件夹的位置", L"", uniSDir, TSelectDirExtOpts() << TSelectDirExtOpt::sdNewUI << TSelectDirExtOpt::sdNewFolder << TSelectDirExtOpt::sdShowEdit, this))
	{
		this->Edit2->Text = uniSDir;
	}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{ 
	DynamicArray uniSDirectories;
	if(SelectDirectory(L"", uniSDirectories, TSelectDirFileDlgOpts() << sdAllowMultiselect, L"请选择文件夹的位置", L"文件夹名字", L"选择文件夹"))
    {
		UnicodeString uniSDir = L"多选文件夹为：";
		for(int i=0; i
			uniSDir += L"rn" + uniSDirectories[i];
        }
		this->Memo1->Lines->Add(uniSDir);
	}
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
	this->Edit1->Clear();//清除文本框
	this->Edit2->Clear();
	this->Memo1->Clear();
}
//---------------------------------------------------------------------------