我一直在测试一些gdi函数,并想用字符串测试一些东西.但是由于某种原因,当我运行此程序时,我收到以下错误:'string'未在此范围内声明
我甚至试图在开头包含"using namespace std"(通常我不必为创建字符串而做)但在这种情况下,在声明std :: string myString之后; 我得到另一个错误说:错误:'string'不是'std'的成员
我能做错什么?完整的代码在这里:
#define _WIN32_WINNT 0x0500 #include#include LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM); TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp"); int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nCmdShow) { HWND hwnd; /* This is the handle for our window */ MSG messages; /* Here messages to the application are saved */ WNDCLASSEX wincl; /* Data structure for the windowclass */ /* The Window structure */ wincl.hInstance = hThisInstance; wincl.lpszClassName = szClassName; wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */ wincl.style = CS_DBLCLKS; /* Catch double-clicks */ wincl.cbSize = sizeof (WNDCLASSEX); /* Use default icon and mouse-pointer */ wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION); wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION); wincl.hCursor = LoadCursor (NULL, IDC_ARROW); wincl.lpszMenuName = NULL; /* No menu */ wincl.cbClsExtra = 0; /* No extra bytes after the window class */ wincl.cbWndExtra = 0; /* structure or the window instance */ /* Use Windows's default colour as the background of the window */ wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND; /* Register the window class, and if it fails quit the program */ if (!RegisterClassEx (&wincl)) return 0; /* The class is registered, let's create the program*/ hwnd = CreateWindowEx ( WS_EX_LAYERED,// | WS_EX_TRANSPARENT, /* Extended possibilites for variation */ szClassName, /* Classname */ _T("Code::Blocks Template Windows App"), /* Title Text */ WS_OVERLAPPEDWINDOW, /* default window */ CW_USEDEFAULT, /* Windows decides the position */ CW_USEDEFAULT, /* where the window ends up on the screen */ 544, /* The programs width */ 375, /* and height in pixels */ HWND_DESKTOP, /* The window is a child-window to desktop */ NULL, /* No menu */ hThisInstance, /* Program Instance handler */ NULL /* No Window Creation data */ ); COLORREF greyishColor = RGB(212, 208, 200); SetLayeredWindowAttributes(hwnd, greyishColor, 0, LWA_COLORKEY); /* Make the window visible on the screen */ ShowWindow (hwnd, 3);//nCmdShow); HDC hdc; hdc = GetDC(hwnd); //drawing a rectangle Rectangle(hdc, 100, 100, 200, 300); ReleaseDC(hwnd, hdc); ///again doing the hdc bit hdc = GetDC(hwnd); HPEN hPenOld; HPEN hLinePen; COLORREF qLineColor = RGB(255, 0 , 0); hLinePen = CreatePen(PS_SOLID, 7, qLineColor); hPenOld = (HPEN)SelectObject(hdc, hLinePen); MoveToEx(hdc, 100, 100, NULL); LineTo(hdc, 500, 250); SelectObject(hdc, hPenOld); DeleteObject(hLinePen); ///again releasing ReleaseDC(hwnd, hdc);
// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
string myString; /* Run the message loop. It will run until GetMessage() returns 0 */ while (GetMessage (&messages, NULL, 0, 0)) { /* Translate virtual-key messages into character messages */ TranslateMessage(&messages); /* Send message to WindowProcedure */ DispatchMessage(&messages); } /* The program return-value is 0 - The value that PostQuitMessage() gave */ return messages.wParam; } /* This function is called by the Windows function DispatchMessage() */ LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) /* handle the messages */ { case WM_DESTROY: PostQuitMessage (0); /* send a WM_QUIT to the message queue */ break; default: /* for messages that we don't deal with */ return DefWindowProc (hwnd, message, wParam, lParam); } return 0; }
Xarn.. 13
std::string
生活在string
头部.#include
在尝试使用它之前,您可能想要实际使用它.