我想在Win 7上用gcc编译一个基本的hello word winform应用程序。
代码是这样的：
/* WINHELLO.C "Hello, world!", Win32 style. */ #include <windows.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); /* WinMain(), our entry point */ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int iCmdShow) { static char szAppName[] = "winhello"; HWND hwnd; MSG msg; WNDCLASSEX wndclass; /* Fill in WNDCLASSEX struct members */ wndclass.cbSize = sizeof(wndclass); wndclass.style = CS_HREDRAW | CS_VREDRAW; wndclass.lpfnWndProc = WndProc; wndclass.cbClsExtra = 0; wndclass.cbWndExtra = 0; wndclass.hInstance = hInstance; wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION); wndclass.hCursor = LoadCursor(NULL, IDC_ARROW); wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); wndclass.lpszClassName = szAppName; wndclass.lpszMenuName = NULL; /* Register a new window class with Windows */ RegisterClassEx(&wndclass); /* Create a window based on our new class */ hwnd = CreateWindow(szAppName, "Hello, world!", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL); /* Show and update our window */ ShowWindow(hwnd, iCmdShow); UpdateWindow(hwnd); /* Retrieve and process messages until we get WM_QUIT */ while ( GetMessage(&msg, NULL, 0, 0) ) { TranslateMessage(&msg); /* for certain keyboard messages */ DispatchMessage(&msg); /* send message to WndProc */ } /* Exit with status specified in WM_QUIT message */ return msg.wParam; } /* Window procedure */ LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) { PAINTSTRUCT ps; HDC hdc; /* Switch according to what type of message we have received */ switch ( iMsg ) { case WM_PAINT: /* We receive WM_PAINT every time window is updated */ hdc = BeginPaint(hwnd, &ps); TextOut(hdc, 100, 100, "Hello, world!", 13); EndPaint(hwnd, &ps); return 0; case WM_DESTROY: /* Window has been destroyed, so exit cleanly */ PostQuitMessage(0); return 0; } /* Send any messages we don't handle to default window procedure */ return DefWindowProc(hwnd, iMsg, wParam, lParam); } 我给编译器的命令是gcc C:\Users\Bobby\Desktop\myfile.c
那么，它寻找图书馆：
C:\Users\Bobby\desktop>gcc C:\Users\Bobby\Desktop\myfile.c C:\Users\Bobby\AppData\Local\Temp\ccT0bq97.o:myfile.c:(.text+0x88): undefined reference to `GetStockObject@4' C:\Users\Bobby\AppData\Local\Temp\ccT0bq97.o:myfile.c:(.text+0x1db): undefined reference to `TextOutA@20' collect2: ld returned 1 exit status PS C:\Users\Scruffy\desktop> .\build.bat C:\Users\Bobby\desktop>gcc C:\Users\Bobby\Desktop\myfile.c -I Gdi32.lib C:\Users\Bobby\AppData\Local\Temp\ccylV5js.o:myfile.c:(.text+0x88): undefined reference to `GetStockObject@4' C:\Users\Bobby\AppData\Local\Temp\ccylV5js.o:myfile.c:(.text+0x1db): undefined reference to `TextOutA@20' collect2: ld returned 1 exit status PS C:\Users\Bobby\desktop> C:\MinGW\
我做了一些谷歌search，我发现，第一个GetStockObject@4是在一个名为Gdi32.lib文件。 所以我search了我的硬盘，并通过MinGW，找不到它。 Lib在哪里find这个函数以及链接到它的方法是什么？ 另外我想我必须链接到TextOutA@20
在这种情况下，应该使用-mwindows子系统选项，而不是显式链接到GDI32：
gcc -Wall -mwindows winhello.c -o winhello.exe
注意：
gcc等人 比.lib更喜欢.a文件，所以你应该一直在寻找libgdi32.a 。 你仍然可以通过给文件名作为参数来链接：
gcc src.c /path/to/example1.lib /path/to/libexample2.a
或对.a文件使用-l选项：
gcc src.c /path/to/example1.lib -L/path/to -lexample2
Windows DLL需要链接器的所谓的导入库来解析对其导出函数的引用。 Microsoft为Windows SDK提供包括Gdi32.lib在内的导入库。 这个文件不应该被部署到最终用户。