請問各位大大... 我使用ComboBox1選擇檔名，並按下Button1開啟.txt檔 如下 code:

void __fastcall TForm1::Button1Click(TObject *Sender)
{
  if(ComboBox1->Text == "Test1")
  {
    ShellExecute(0,"open","notepad.exe","D:\\Test data\\Test1.txt",NULL,SW_SHOW);
  }      if(ComboBox1->Text == "Test2")
  {
    ShellExecute(0,"open","notepad.exe","D:\\Test data\\Test2.txt",NULL,SW_SHOW);
  }      if(ComboBox1->Text == "Test3")
  {
    ShellExecute(0,"open","notepad.exe","D:\\Test data\\Test3.txt",NULL,SW_SHOW);
  }
}
 

以上是ok的沒問題 但我為了以後方便開啟多個不同的txt檔 而改寫成

 
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  if(ComboBox1->Text == String(ComboBox1->Text))
  {
    ShellExecute(0,"open","notepad.exe","D:\\Test data\\"+String(ComboBox1->Text)+".txt",NULL,SW_SHOW);
  }
}

為何就會有錯誤呢 [C++ Error] Unit1.cpp(40): E2034 Cannot convert 'AnsiString' to 'const char *' [C++ Error] Unit1.cpp(40): E2342 Type mismatch in parameter 'lpParameters' (wanted 'const char *', got 'AnsiString') 請各位大大幫我看看code要怎麼改...TKS

您好: 改成下面這樣應該就可以了

 
if(ComboBox1->Text == String(ComboBox1->Text))
   {
      AnsiString FileName = "D:\\Test data\\" String(ComboBox1->Text) ".txt";
      ShellExecute(0, "open", "notepad.exe", FileName.c_str(), NULL, SW_SHOW);
   }

順心

感謝taishyang副站長大大解答!!