"hInstance"未定义。C++ WIN32 应用程序

"hInstance" is undefined. c++ WIN32 APP

本文关键字：WIN32 应用程序 C++ hInstance 未定义      更新时间：2023-10-16

Win32 应用程序。在MyRegisterClass中，wc.hInsance = hInstance.显然"hInstane是一个未定义的idetifier。这是为什么呢？我使用的是Visual Studio 2013，并且正在关注Jonathan S Harbours关于游戏编程的书。

法典。

include <Windows.h>
include <time.h>
include <iostream>
using namespace std;
const string APPTITLE = "Game Loop";
HWND window;
HDC device;
bool gameover = false;
void DrawBitmap(char *filename, int x, int y){
    HBITMAP image = (HBITMAP)LoadImage(0, "c.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
    BITMAP bm;
    GetObject(image, sizeof(BITMAP), &bm);
    HDC hdcImage = CreateCompatibleDC(device);
    SelectObject(hdcImage, image);
    BitBlt(
           device,
           x, y,
           bm.bmWidth, bm.bmHeight,
           hdcImage,
           0, 0,
           SRCCOPY);
    DeleteDC(hdcImage);
    DeleteObject((HBITMAP)image);
}
bool Game_Init(){
    srand(time(NULL));
    return 1;
}
void Game_Run(){
    if (gameover == true)return;
    RECT rect;
    GetClientRect(window, &rect);
    int x = rand() % (rect.right - rect.left);
    int y = rand() % (rect.bottom - rect.top);
    DrawBitmap("c.bmp", x, y);
}
void Game_End(){
    ReleaseDC(window, device);
}
LRESULT CALLBACK WinProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
    switch (message){
        case WM_DESTROY:{
            gameover = true;
            PostQuitMessage(0);
            break;
        }
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    ATOM MyRegisterClass(HINSTANCE hInstance); {
        WNDCLASSEX wc;
        wc.cbSize = sizeof(WNDCLASSEX);
        wc.style = CS_HREDRAW | CS_VREDRAW;
        wc.lpfnWndProc = (WNDPROC)WinProc;
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        wc.hInstance = hInstance;
        wc.hIcon = NULL;
        wc.hCursor = LoadCursor(NULL, IDC_ARROW);
        wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
        wc.lpszMenuName = NULL;
        wc.lpszClassName = APPTITLE.c_str();
        wc.hIconSm = NULL;
    }
}

代码的结尾应该是：

}
ATOM MyRegisterClass(HINSTANCE hInstance) {
    WNDCLASSEX wc;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = (WNDPROC)WinProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = NULL;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = APPTITLE.c_str();
    wc.hIconSm = NULL;
    return ::RegisterClassEx(&wc);
}

注意：

  • MyRegisterClass定义中没有分号
  • MyRegisterClass末尾只有一个大括号
    • 在
  • 定义上方添加右大括号MyRegisterClass

这样代码就可以正确编译。

程序中有一个杂散的分号：

ATOM MyRegisterClass(HINSTANCE hInstance); { // <-- Delete this

尝试删除它，看看它是否能解决问题。

希望这有帮助！

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