c++ - 从编辑控件中获取文本(纯 Win32 API)

Question

多年来，我一直在努力让它发挥作用，但无济于事(悲伤的表情)。

int iChars = GetWindowTextLength (GetDlgItem(handle,ID))+1; // Room for '\0'
char* pstrText;
pstrText = (char*) malloc (sizeof(char)*iChars);
if (pstrText != NULL) {
    //GetWindowText (GetDlgItem(handle,ID), pstrText, iChars);
        GetDlgItemText(handle,ID,pstrText,iChars);
}
return pstrText; // Memory gets freed after it returns

工作示例:

char* MWC::System::TextBox::GetText(){
    int len = SendMessage(handle, WM_GETTEXTLENGTH, 0, 0);
    char* buffer = new char[len];
    SendMessage(handle, WM_GETTEXT, (WPARAM)len+1, (LPARAM)buffer);
    return buffer;
}

Answer 1

此处wParam参数错误:

SendMessage(handle, WM_GETTEXT, (WPARAM)len, (LPARAM)buffer);

由于零终止符，您应该传递 len+1。