Check if a textbox control is empty C++ Win32

Question

i have this code that put the value of a textbox field in the variable. The textbox is a Ip Address Control. How can i check if when the user press the OK button the field is empty or not? Thank you

char *myVar = new char[16];
*myVar = NULL;

GetDlgItemTextA(hDlg, IDC_MYVAR, myVar, 16);

delete [] myVar;

Answer 1

我只需要掌握控件的HWND ，将其发送给WM_GETTEXTLENGTH并将答案与零进行比较即可。

Answer 2

您可能必须使用IPM_ISBLANK消息（我不是winapi的专家，所以我可能会误会）。

Answer 3

Just check whether myVar[0] is zero after calling GetDlgItemTextA .

char myVar[16];
GetDlgItemTextA(hDlg, IDC_MYVAR, myVar, 16);
if (myVar[0] == 0) // then field is empty

Answer 4

参见此处： GetWindowText函数