c语言怎么做ui界面？

c语言制作UI界面需要相关的UI库

如windows操作系统本身就提供了UI的接口

一个简单的示例代码如下

#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hinstance,HINSTANCE hprevinstance,LPSTR line,int cmd)

{

static TCHAR AppName[]=TEXT("99");

HWND hwnd;

MSG msg;

WNDCLASS 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.hCursor=LoadCursor(NULL,IDC_ARROW);

wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

wndclass.lpszMenuName=NULL;

wndclass.lpszClassName=AppName;

if(!RegisterClass(&wndclass))

{

MessageBox(NULL,TEXT("This program requires Windows NT!"),AppName,MB_ICONERROR);

return 0;

}

hwnd=CreateWindow(AppName,TEXT("九九乘法口诀表"),\

WS_OVERLAPPEDWINDOW,\

CW_USEDEFAULT,\

CW_USEDEFAULT,\

CW_USEDEFAULT,\

CW_USEDEFAULT,\

NULL,\

NULL,\

hinstance,\

NULL);

ShowWindow(hwnd,cmd);

UpdateWindow(hwnd);

while(GetMessage(&msg,NULL,0,0))

{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wparam,LPARAM lparam)

{

HDC hdc;

PAINTSTRUCT ps;

RECT rect;

static x,y;

int i,j;

int len;

TCHAR buf[50];

TEXTMETRIC tm;

switch(message)

{

case WM_CREATE:

hdc=GetDC(hwnd);

GetTextMetrics(hdc,&tm);

x=tm.tmAveCharWidth;

y=tm.tmHeight+tm.tmExternalLeading;

ReleaseDC(hwnd,hdc);

//MessageBox(NULL,TEXT("Create Successed!"),TEXT("Successed"),MB_OK);

//PlaySound(TEXT("hello.wav"),NULL,SND_FILENAME|SND_ASYNC);

return 0;

case WM_PAINT:

hdc=BeginPaint(hwnd,&ps);

GetClientRect(hwnd,&rect);

//DrawText(hdc,TEXT("Hello World!"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);

//TextOut(hdc,rect.right/2-(strlen("Hello World!")/2)*x,rect.bottom/2-y/2,TEXT("Hello World!"),12);

for(i=1;i!=10;++i)

{

for(j=1;j!=i+1;++j)

{

len=wsprintf(buf,TEXT("%dx%d=%-4d"),j,i,i*j);

TextOut(hdc,j*len*x,i*y,buf,len);

}

}

EndPaint(hwnd,&ps);

return 0;

case WM_DESTROY:

PostQuitMessage(0);

return 0;

}

return DefWindowProc(hwnd,message,wparam,lparam);

}

上面是一个打印windows下拥有窗口界面的九九乘法口诀表的c语言程序代码

同样的c语言也会有其它的UI库

比如Gtk，Gtk是可移植的UI库

可以使用它在Linux、windows包括mac等等操作系统上做ui程序设计

一个简单的示例代码如下

#include <gtk/gtk.h>

int main(int argc,char **argv)

{

GtkWidget *win;

GtkWidget *label;

int i,j;

GString *str;

gtk_init(&argc,&argv);

win=gtk_window_new(GTK_WINDOW_TOPLEVEL);

gtk_window_set_position(GTK_WINDOW(win),GTK_WIN_POS_CENTER);

g_signal_connect(G_OBJECT(win),"delete-event",G_CALLBACK(gtk_main_quit),NULL);

str=g_string_new(NULL);

for(i=1;i <= 9;++i)

{

for(j=1;j != i+1;++j)

g_string_append_printf(str,"%dx%d=%-4d",j,i,i*j);

g_string_append(str,"\n");

}

label=gtk_label_new(str->str);

gtk_container_add(GTK_CONTAINER(win),label);

gtk_widget_show_all(win);

gtk_main();

g_string_free(str,TRUE);

return 0;

}