在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
;PJWd|3
+n]U3b 一、实现方法
]S[zD|U% m El*{] 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
IEdC
_6G |*7uF<ink6 #pragma data_seg("shareddata")
a8-2:8Su HHOOK hHook =NULL; //钩子句柄
Rv6{'\: UINT nHookCount =0; //挂接的程序数目
!Ljs9 =UF static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
#:Di1I9<O7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
su(y*187A static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
0iW]#O/ static int KeyCount =0;
&eT)c<yhyK static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
'N],d&fu^^ #pragma data_seg()
I;L$Nf{v bh?Vufd%) 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
uYS?# g =8j;!7p DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
pc5-'; n SHPaSq'&N BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Rs:<'A cKey,UCHAR cMask)
G.O0*E2V {
#H(|+WEu BOOL bAdded=FALSE;
)]!Ps` ,u for(int index=0;index<MAX_KEY;index++){
7ju7QyR if(hCallWnd[index]==0){
Gu<3*@Ng hCallWnd[index]=hWnd;
I~MBR2$9 HotKey[index]=cKey;
yE-&TW_q:> HotKeyMask[index]=cMask;
hZ.Sj~>7` bAdded=TRUE;
_Q/D%7[pa KeyCount++;
j_\sdH*r break;
kqSCKY1 }
{SW104nb }
|,5b[Y"Dt return bAdded;
0X -u'=Bs }
er^z:1' //删除热键
fSl+;|Kn BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>\8Bu#&s4 {
tuK"}HepB BOOL bRemoved=FALSE;
b/ 'fC%o, for(int index=0;index<MAX_KEY;index++){
t/_w} if(hCallWnd[index]==hWnd){
#;a
1=8H if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
UKQ,]VC hCallWnd[index]=NULL;
Fg?Gx(g4 HotKey[index]=0;
qI<6% ^i HotKeyMask[index]=0;
,v$gQU2 bRemoved=TRUE;
M'W@K KeyCount--;
hyL3fkMJ, break;
n
w @cAv }
e6k}-<W*q }
_$0<]O$ }
jwTb09 return bRemoved;
D*`|MzlQ }
PX[taDN ^M
PU?k UMo=bs DLL中的钩子函数如下:
&6PZX0M oKz|hks[6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Uq~{=hMX {
>c\'4M8Cz BOOL bProcessed=FALSE;
i=reJ(y- if(HC_ACTION==nCode)
_+%-WFS| {
xg'z_W if((lParam&0xc0000000)==0xc0000000){// 有键松开
E$34myOVf switch(wParam)
iquB]z' {
ss% ahs case VK_MENU:
jio1#& MaskBits&=~ALTBIT;
$B*E k>EK break;
RqXcL,,9 case VK_CONTROL:
vd SV6p.d MaskBits&=~CTRLBIT;
4<70mUnt break;
5P
-IZ8~$ case VK_SHIFT:
De4UGX MaskBits&=~SHIFTBIT;
IQoz8!guh: break;
mmAikT#k default: //judge the key and send message
j.sxyW?3 break;
Y1H8+a5@ }
$91c9z;f^ for(int index=0;index<MAX_KEY;index++){
D.j'n-yw if(hCallWnd[index]==NULL)
p<'#f,o continue;
~o= Sxaf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oU$Niw9f {
m7^aa@^m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
z;GnQfYG bProcessed=TRUE;
$=4T# W=m }
&iR>:=ksN }
6/wAvPB$ }
^u:7U4 else if((lParam&0xc000ffff)==1){ //有键按下
A0cC)bd& switch(wParam)
X +*@ {
(X,Ua+{ case VK_MENU:
za1MSR MaskBits|=ALTBIT;
vO%n~l= break;
R(kr@hM case VK_CONTROL:
_,=A\C_b@ MaskBits|=CTRLBIT;
|J'@-*5?[8 break;
Cv>|>Ob# case VK_SHIFT:
%8>s :YG MaskBits|=SHIFTBIT;
4g b2$" ! break;
A$WE:<^ default: //judge the key and send message
{^Vkxf] break;
BP,"vq $'+ }
2Auhv!xV for(int index=0;index<MAX_KEY;index++){
gtyo~f if(hCallWnd[index]==NULL)
I(#Y\>DG continue;
Z2(z,pK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pB&3JmgR$) {
(LA%q6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
JaXT
B"e bProcessed=TRUE;
G`8gI)$u }
iP~5= }
8t!(!<iF0 }
#gMMhB= if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
#Bg88!-4 for(int index=0;index<MAX_KEY;index++){
&vLz{ if(hCallWnd[index]==NULL)
,icgne1j continue;
mFjX if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
EQSOEf[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,@tkL!"9q //lParam的意义可看MSDN中WM_KEYDOWN部分
*$Z}v&-0k }
iN"kv }
JC(rSs* }
$/Gvz)M return CallNextHookEx( hHook, nCode, wParam, lParam );
VJDF/)X3$ }
P_B# -/ ;y*mP 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
;3U-ghj & 1p\.Y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
UZi^ & BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-ZlBg~E zIi|z}WJ 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
NEa: &W-L`aFd0 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
FAfk;<#'n+ {
x9Y1v1!5Pu if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;gYW!rM {
=MEv{9_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
5DK>4H: SaveBmp();
K}tl,MMU return FALSE;
(wEaa'XL }
L@HPU;< …… //其它处理及默认处理
q&Y'zyHLP }
gS _)( vp?87h nBI?~hkP3 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
u =z$**M^ :6S!1roi 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
VLC<ju! B]L5K~d 二、编程步骤
U&yXs'3a& Rq )&v*= 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
QG*=N {%5 t.$3?"60~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
H;s BAG)
- 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
XE*
@* 7Ab&C&3 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
4sasf94 ,;)Y1q}Q 5、 添加代码,编译运行程序。
}l~|c{WH` &PVos|G 三、程序代码
7yD=~l\Bbs /x,gdZPX ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
e:fp8 k< #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
91qk0z`N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
PElC0qCn[ #if _MSC_VER > 1000
<cNXe4( #pragma once
WSi`)@.XO #endif // _MSC_VER > 1000
NUbw]Y90~ #ifndef __AFXWIN_H__
u~[HC)4(0 #error include 'stdafx.h' before including this file for PCH
fuSfBtLPR# #endif
LSQWveZz #include "resource.h" // main symbols
59!yz'feF class CHookApp : public CWinApp
t~ruP',~\ {
Zt4g G KG public:
3I&=1o CHookApp();
?%%
'GX // Overrides
|I-;CoAg // ClassWizard generated virtual function overrides
~qt)r_jW //{{AFX_VIRTUAL(CHookApp)
W^npzgDCo public:
n|2`y? virtual BOOL InitInstance();
Z>gxECi virtual int ExitInstance();
*GleeJWz //}}AFX_VIRTUAL
7 4Xk^8 //{{AFX_MSG(CHookApp)
PtCO';9[ // NOTE - the ClassWizard will add and remove member functions here.
NAjY,)>'K // DO NOT EDIT what you see in these blocks of generated code !
IROX]f}r ( //}}AFX_MSG
4)0 %^\p DECLARE_MESSAGE_MAP()
sd9$4k" };
i!+D
,O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
F1) B-wW BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vQ/}E@?u BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
yI/2 e [ BOOL InitHotkey();
nlmc/1C BOOL UnInit();
*vt5dxB #endif
A'r 3%mC E9z^# @s //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
qzS 9ls>> #include "stdafx.h"
CF"$&+ s9 #include "hook.h"
rCfr&>nn #include <windowsx.h>
K~ ,|~ #ifdef _DEBUG
ZycV?ob8} #define new DEBUG_NEW
5I/wP qR[ #undef THIS_FILE
x2x)y08 static char THIS_FILE[] = __FILE__;
1{l18B` #endif
Ri4t/H #define MAX_KEY 100
kR$>G2$! #define CTRLBIT 0x04
Wt5x*p-!C #define ALTBIT 0x02
OLh`R]Sd #define SHIFTBIT 0x01
|$"2R3 #pragma data_seg("shareddata")
!$Aijd s5 HHOOK hHook =NULL;
]T|9>o! UINT nHookCount =0;
Xou1X$$z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
)OQhtxK static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
WeDeD\zy static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
maAZI-H{ static int KeyCount =0;
L1=3_fO static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
L08>9tf` #pragma data_seg()
,<?iL~> % HINSTANCE hins;
d\aKGq;8C void VerifyWindow();
u>c\J|K_V BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
?#;
oqH< //{{AFX_MSG_MAP(CHookApp)
^2f'I iE // NOTE - the ClassWizard will add and remove mapping macros here.
S^q)DuF5! // DO NOT EDIT what you see in these blocks of generated code!
+v4P9V|s //}}AFX_MSG_MAP
w1HE^
/ END_MESSAGE_MAP()
rt">xVl <X[TjP CHookApp::CHookApp()
h/~:}Bof {
r>73IpJI // TODO: add construction code here,
_svEPHU // Place all significant initialization in InitInstance
h 'VN& T, }
j.FA!4L 4w,=6|# CHookApp theApp;
5v"r>q[
X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
uD4=1g6[s {
1=BDqSZ@9 BOOL bProcessed=FALSE;
Td#D\d\R if(HC_ACTION==nCode)
V.zKjoky@ {
)"k>}&' if((lParam&0xc0000000)==0xc0000000){// Key up
lyGQ6zlSn switch(wParam)
UjibQl3:m {
272j$T case VK_MENU:
]=\Mf< MaskBits&=~ALTBIT;
m|q?gX9R break;
z'@j9vT case VK_CONTROL:
n8<o*f&&9> MaskBits&=~CTRLBIT;
dFY]~_P472 break;
n\d`Fk case VK_SHIFT:
i`[5%6\"& MaskBits&=~SHIFTBIT;
+5J "G/f break;
'J^ M`/ default: //judge the key and send message
<$\vL break;
s ^NO( }
pR_cI]{=SA for(int index=0;index<MAX_KEY;index++){
FTM(y CN if(hCallWnd[index]==NULL)
Jf\lnJTyU8 continue;
dw
%aoe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f[,9WkC {
%Q]u_0P* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lfjY45= bProcessed=TRUE;
yXU-@~ }
(vte8uQe }
bqugo }
s2Gi4fY? else if((lParam&0xc000ffff)==1){ //Key down
Y.I-hl1<r switch(wParam)
zJ{?'kp {
6o@}k9AN case VK_MENU:
{\-rZb==F2 MaskBits|=ALTBIT;
!NWz break;
B;9"=0 case VK_CONTROL:
)"?6Es SF MaskBits|=CTRLBIT;
qz7:jq3N-{ break;
[8*Ovd case VK_SHIFT:
cBf9-k MaskBits|=SHIFTBIT;
;t!n%SnK9! break;
w0QN5? default: //judge the key and send message
e&[gde( break;
wX}N=== }
;\`~M for(int index=0;index<MAX_KEY;index++)
Enee\!@v {
gfQ&U@N if(hCallWnd[index]==NULL)
"zW3dKVc continue;
=4GJYhj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(]wi^dE {
b?Wg|D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
3L/qU^` bProcessed=TRUE;
VM{`CJ2 }
j]7|5mC78 }
{Z[yY6Nu }
c>fLSf if(!bProcessed){
#.O,JG#H for(int index=0;index<MAX_KEY;index++){
:T~Aa(%( if(hCallWnd[index]==NULL)
\8\)5#? continue;
f.V;Hl, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
qh
Ezv~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V~LZ%NZ8 }
x4v@Kk/ }
w+VeT @ }
}HS:3Dt return CallNextHookEx( hHook, nCode, wParam, lParam );
Ke[doQ#c }
dDH+`;$. F\1nc"K/( BOOL InitHotkey()
y7SOz'd {
:0o
$qz2 if(hHook!=NULL){
h"VQFqQy nHookCount++;
Tk s;,C return TRUE;
cT{iMgdI? }
AoHA+>&U else
Lm+!/e hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
VlW#_. if(hHook!=NULL)
~^/zCPy[w nHookCount++;
J5L P#o(V return (hHook!=NULL);
$mm =$. }
r`u}n BOOL UnInit()
rUfW0 {
3{_A zL if(nHookCount>1){
3WyK!@{ nHookCount--;
ga#,42)H return TRUE;
tb,.f3; }
$w%oLI@kl BOOL unhooked = UnhookWindowsHookEx(hHook);
/^96| if(unhooked==TRUE){
!8&,GT nHookCount=0;
J*6I@_{/U hHook=NULL;
E%eao$ }
3ojK2F(1D return unhooked;
1wUZ0r1' }
Cw?AP6f% xrx{8pf BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6QdNGpN {
O{8"f\* BOOL bAdded=FALSE;
^)N[x''a for(int index=0;index<MAX_KEY;index++){
^&<~6y}U^ if(hCallWnd[index]==0){
47I:o9E hCallWnd[index]=hWnd;
sBuJK' HotKey[index]=cKey;
>V(>2eD'S HotKeyMask[index]=cMask;
.jMm-vox} bAdded=TRUE;
mFayU w KeyCount++;
]i*q*]x2u break;
@_YEK3l]l }
zF/}s_><* }
[i[G" %Q return bAdded;
vZ
4Z+;. }
4zghM< jIE>t5 fy BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kFv\V {
7UHqiA`L BOOL bRemoved=FALSE;
ih`/1n for(int index=0;index<MAX_KEY;index++){
Z_' %'&Y if(hCallWnd[index]==hWnd){
q?z6|]M|u if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$n `Zvl2 hCallWnd[index]=NULL;
Qpd-uC_Ni HotKey[index]=0;
YN] w_= HotKeyMask[index]=0;
}7hpx!s, bRemoved=TRUE;
j5z, l KeyCount--;
*F:]mgg break;
'R_U,9y` }
D,xWc|V }
9CJUOB>] }
Af=%5% return bRemoved;
`'Ta=kd3 }
Js+d4``W ^FgNg'"[3 void VerifyWindow()
~m!>e])P?X {
yG&kP:k< for(int i=0;i<MAX_KEY;i++){
/6{`6(p if(hCallWnd
!=NULL){ B2d$!Any
if(!IsWindow(hCallWnd)){ > 0 !J]gK
hCallWnd=NULL; 4\pA^%73
HotKey=0; d1e'!y}R5
HotKeyMask=0; &o"Hb=k<
KeyCount--; }=A6Jv(j
} 7i{Rn K6*
} rQ}4\PTi
} !Go(8`>
} m?<8 ':
R
$'}Z
BOOL CHookApp::InitInstance() 3FPy"[[
{ &Wd,l$P<O
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 2?t(%uf]
hins=AfxGetInstanceHandle(); t)XV'J
InitHotkey(); ORQGay
return CWinApp::InitInstance(); iN<5[ztd
} 6?*iIA$b
SJU93n"G/
int CHookApp::ExitInstance() n!Y.?mU6
{ t{~"vD9Am
VerifyWindow(); 5YS`v#+
UnInit(); vlIdi@V
return CWinApp::ExitInstance(); v{
C]\8
} QN_5q5
V EY !0PIj
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @mP@~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /l(:H
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ q,nj|9z V
#if _MSC_VER > 1000 gEKJrAA
#pragma once }/c.>U
#endif // _MSC_VER > 1000 #PXl*~PrQ/
4L!{U@'
class CCaptureDlg : public CDialog IUd>jHp`6
{ |<y[gj4`T/
// Construction KH pxWq
public: KXw
\N!
BOOL bTray; um,/^2A
BOOL bRegistered; w2{k0MW
BOOL RegisterHotkey(); /2'\ya4B
UCHAR cKey; nr&G4t+%Hv
UCHAR cMask; z*yN*M6t
void DeleteIcon(); u"T5m
void AddIcon(); ls*^3^O
UINT nCount; zN5i}U=|r
void SaveBmp(); e}[$ =
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4]
?
// Dialog Data oPa2GW8
//{{AFX_DATA(CCaptureDlg) *qOo,e
enum { IDD = IDD_CAPTURE_DIALOG }; d1y(Jt
CComboBox m_Key; 8.k"kXU@n
BOOL m_bControl;
IR/0gP
BOOL m_bAlt; 0@AK
BOOL m_bShift; (59<Zo
CString m_Path; yv3myaS
CString m_Number; |lJXI:GG
//}}AFX_DATA /2l4'Q=
// ClassWizard generated virtual function overrides D%^EG8i n.
//{{AFX_VIRTUAL(CCaptureDlg) \XRViG,|5
public: ?-@hNrx
virtual BOOL PreTranslateMessage(MSG* pMsg);
^[zF_df
protected: s ^)W?3t]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FNc[2sI
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o{-PT'
//}}AFX_VIRTUAL /c'#+!19
// Implementation 0w+hf3K+:
protected: c"O\fX
HICON m_hIcon; L7D'wf
// Generated message map functions g"T~)SQP
//{{AFX_MSG(CCaptureDlg) ?Fi-,4
virtual BOOL OnInitDialog(); f[|xp?ef
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TqQ>\h"&_
afx_msg void OnPaint(); 0eQ5LG?)
afx_msg HCURSOR OnQueryDragIcon(); ORtl~V'
virtual void OnCancel(); :~T:&;q0
afx_msg void OnAbout(); uL-i>!"L!}
afx_msg void OnBrowse(); =,T~F3pK
afx_msg void OnChange(); #v&&GuF
//}}AFX_MSG ;U20g:K
DECLARE_MESSAGE_MAP() Q 5@~0
}; a'T|p)N.;T
#endif j,1,;
}WCz*v1Wq
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2o\\qEYg
#include "stdafx.h" up:e0di{
#include "Capture.h" o.Cj+`0} 5
#include "CaptureDlg.h" -q+Fj;El
#include <windowsx.h> 0A1l"$_|
#pragma comment(lib,"hook.lib") tkuN$Jl
#ifdef _DEBUG u8?ceM^r
#define new DEBUG_NEW R8],}6,;E}
#undef THIS_FILE zb;'}l;+
static char THIS_FILE[] = __FILE__; 4&y_+
#endif L\-T[w),z7
#define IDM_SHELL WM_USER+1 q>Q|:g&:
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2iH,U
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .5dZaI)
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @Rx/]wyH
class CAboutDlg : public CDialog K/%aoTO}
{ {qx"/;3V
public: QGLm4 Wl9
CAboutDlg(); .IKK.G
// Dialog Data " g_\W
//{{AFX_DATA(CAboutDlg) BV!Kiw
enum { IDD = IDD_ABOUTBOX }; `E|IMUB~
//}}AFX_DATA cA/2,i
// ClassWizard generated virtual function overrides dUe"qH29s
//{{AFX_VIRTUAL(CAboutDlg) {Ua5bSbh
protected: {X"X.`p
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *g=*}2
//}}AFX_VIRTUAL D6ck1pxkx
// Implementation x65e,'
protected: QPFpGS{d
//{{AFX_MSG(CAboutDlg) !4 hs9b
//}}AFX_MSG @x=CMF15
DECLARE_MESSAGE_MAP() "n8_Ag@r
}; ;l`8w3fDt
~Yr.0i.W
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (>8fcQUBb
{ N@A#e/8
//{{AFX_DATA_INIT(CAboutDlg) F8=6!Qj
//}}AFX_DATA_INIT @ym7hk.
} ,U2D&{@
<v2R6cj5
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D:F!;n9
{ [0~qs|27
CDialog::DoDataExchange(pDX); >K
&b,o,[
//{{AFX_DATA_MAP(CAboutDlg) { j/w3
//}}AFX_DATA_MAP t 1&p>
v
} ar^`r!ABEh
$K,aLcu
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ' l!QGKz
//{{AFX_MSG_MAP(CAboutDlg) lhjPS!A~
// No message handlers
k,@1rOf
//}}AFX_MSG_MAP C u?$!|V
END_MESSAGE_MAP() &1?Q]ZRp
DX!$k[
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6g.@I!j E
: CDialog(CCaptureDlg::IDD, pParent) )b-G2< kb
{ zh4o<f:-
//{{AFX_DATA_INIT(CCaptureDlg) snK9']WXo
m_bControl = FALSE; H~$|y9>qI
m_bAlt = FALSE; |j!D _j#U
m_bShift = FALSE; 4B> l|%
m_Path = _T("c:\\"); /z'j:~`E
m_Number = _T("0 picture captured."); PAc~p8S
nCount=0; MRC5c:(
bRegistered=FALSE; e1IuobT
bTray=FALSE; /0\pPc*kA{
//}}AFX_DATA_INIT S\X_!|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $jzk4V
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); u(~s$ENl
} H{}6`;W
]':C~-RV{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (%r:PcGMEV
{ u3<])}I'
CDialog::DoDataExchange(pDX); Z6*RIdD>
//{{AFX_DATA_MAP(CCaptureDlg) -Kc-eU-&q
DDX_Control(pDX, IDC_KEY, m_Key); |/(5GX,X
DDX_Check(pDX, IDC_CONTROL, m_bControl); r;'!qwr
DDX_Check(pDX, IDC_ALT, m_bAlt); s=d?}.E$
DDX_Check(pDX, IDC_SHIFT, m_bShift); !*cf}<Kmw
DDX_Text(pDX, IDC_PATH, m_Path); },"g*
DDX_Text(pDX, IDC_NUMBER, m_Number); mb/3
#)
//}}AFX_DATA_MAP O^<6`ku
} y>#j4%D~4
m2}&5vD8-
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %EpK=;51U
//{{AFX_MSG_MAP(CCaptureDlg) *CG2sAeB
ON_WM_SYSCOMMAND() Hv=coS>g:
ON_WM_PAINT() \.{JS>!
ON_WM_QUERYDRAGICON() YW'Y=*
ON_BN_CLICKED(ID_ABOUT, OnAbout) "E8!{
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LNg1q1P3
ON_BN_CLICKED(ID_CHANGE, OnChange) K)14v;@
//}}AFX_MSG_MAP <AIsNqr
END_MESSAGE_MAP() F0!r9U((
&B.r&K&
BOOL CCaptureDlg::OnInitDialog() dn5v|[ dJ
{ q{@Wn]!k
CDialog::OnInitDialog(); q3[LnmH
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); UkYQ<MNO
ASSERT(IDM_ABOUTBOX < 0xF000); %z2nas$$g
CMenu* pSysMenu = GetSystemMenu(FALSE); F+6ZD5/
if (pSysMenu != NULL) p!691LI
{ O3_Mrn(R
CString strAboutMenu; !of7]s
strAboutMenu.LoadString(IDS_ABOUTBOX);
jab]!eY
if (!strAboutMenu.IsEmpty()) K4rr.f6
{ t.zSJ|T_&O
pSysMenu->AppendMenu(MF_SEPARATOR); z6!X+`&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'l}3Iua6qk
} vIRE vj#U
} lAGxE-B^a"
SetIcon(m_hIcon, TRUE); // Set big icon 5bAXa2Vt
SetIcon(m_hIcon, FALSE); // Set small icon WDX?|q9rCt
m_Key.SetCurSel(0); #[si.rv->
RegisterHotkey(); H z6H,h
CMenu* pMenu=GetSystemMenu(FALSE); q[#\qT&QU
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u1"e+4f
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]@f6O*&=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i" )_M|
return TRUE; // return TRUE unless you set the focus to a control l?~ci
;lG
} lz*PNT{E
w iq{Jo#
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }iC~B}
{ AVJk
if ((nID & 0xFFF0) == IDM_ABOUTBOX) tL5Xfd?u
{ }/LYI
CAboutDlg dlgAbout; I*ej_cFQ^
dlgAbout.DoModal(); _c&*'IY[V
} 4EpzCaEZ
else Za} |Ee
{ ke%zp-2c
CDialog::OnSysCommand(nID, lParam); 06`__$@h
} ?yz%r`;r
} w(yU\
N
08f~vw"
void CCaptureDlg::OnPaint() -3V~YhG
{ i`Yf|^;@2>
if (IsIconic()) b'OO~>86
{ !69^kIi$
CPaintDC dc(this); // device context for painting -r2cK{Hhp&
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cU>&E*wD
// Center icon in client rectangle 7mjj%
int cxIcon = GetSystemMetrics(SM_CXICON); QA3l:D}u
int cyIcon = GetSystemMetrics(SM_CYICON); KZE.}8^%D
CRect rect; 2eK\$_b_
GetClientRect(&rect); e!8_3BE
int x = (rect.Width() - cxIcon + 1) / 2; <_>6a7ra
int y = (rect.Height() - cyIcon + 1) / 2; /;0>*ft4
// Draw the icon d{he
dc.DrawIcon(x, y, m_hIcon); EH:1Z*|Z{\
} q^cF D
else C0W~Tk\C2
{ v Y\O=TZT
CDialog::OnPaint(); ^M9oTNk2
} P=@lkF!\#
} w(U/(C7R
D6]$P%t9
HCURSOR CCaptureDlg::OnQueryDragIcon() D7.P
{ K4yYNlY
return (HCURSOR) m_hIcon; hK"=~\,
} lEDHx[q
I Q L~I13
void CCaptureDlg::OnCancel() HLk"a-+'
{ 9e&#;6l
if(bTray) F:g{rm[
DeleteIcon(); 3azc `[hl
CDialog::OnCancel(); )eEvyU
} ob7_dWAG
'k67$H
void CCaptureDlg::OnAbout() s,v#lJ]d0W
{ >2:S v1T
CAboutDlg dlg; c 2@@Rd~M
dlg.DoModal(); l!y
_P
} +m.8*^
!VHIl&Mos
void CCaptureDlg::OnBrowse() Ib\G{$r
{ WK}+f4tdW[
CString str; jq]"6/xxb
BROWSEINFO bi; $ddYH
char name[MAX_PATH]; {t:ND
ZeroMemory(&bi,sizeof(BROWSEINFO)); O)|4>J*B
bi.hwndOwner=GetSafeHwnd(); 0%F.]+6[O4
bi.pszDisplayName=name; \.a .'l
bi.lpszTitle="Select folder"; G7;}309s
bi.ulFlags=BIF_RETURNONLYFSDIRS; EM*OrUe
LPITEMIDLIST idl=SHBrowseForFolder(&bi); LPn}QzH
if(idl==NULL) Zsogx}i-
return; w2+]C&B*
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #}(Df&
str.ReleaseBuffer(); |w2AB7EU
m_Path=str; }#x3IE6'
if(str.GetAt(str.GetLength()-1)!='\\') 55LF
m_Path+="\\"; fB96Q
UpdateData(FALSE); mv.I.EL
} V^z;^mdd
)T5h\ZO`;
void CCaptureDlg::SaveBmp() %m) h1/l
{ )JQQ4D
CDC dc; {Yk20Zn
dc.CreateDC("DISPLAY",NULL,NULL,NULL); BmFME0
CBitmap bm; *F*fH>?C#
int Width=GetSystemMetrics(SM_CXSCREEN); 0|!<|N<
int Height=GetSystemMetrics(SM_CYSCREEN); j2 ^T:q[
bm.CreateCompatibleBitmap(&dc,Width,Height); [Be53U{=
CDC tdc; "T%'Rp`j|
tdc.CreateCompatibleDC(&dc); p.] .M"A
CBitmap*pOld=tdc.SelectObject(&bm); AV4HX\`{P0
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cu^*x/0,
tdc.SelectObject(pOld); @!/fvP
BITMAP btm; 25n(&NV
bm.GetBitmap(&btm); 'F?Znd2L
DWORD size=btm.bmWidthBytes*btm.bmHeight; !s*''v*
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8ysK VF
BITMAPINFOHEADER bih; eJGos!>*
bih.biBitCount=btm.bmBitsPixel; jgKL88J*\
bih.biClrImportant=0; ].P(/~FS9
bih.biClrUsed=0; }l?_Cfvu
bih.biCompression=0; SzlfA%4+GR
bih.biHeight=btm.bmHeight; !TL}~D:J
bih.biPlanes=1; K('lH-3wS
bih.biSize=sizeof(BITMAPINFOHEADER); 51opP8
bih.biSizeImage=size; d 4\E
bih.biWidth=btm.bmWidth; >MWpYp
bih.biXPelsPerMeter=0; ynbpew aa
bih.biYPelsPerMeter=0; P&3/nL$9N
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :@`(}5F4
static int filecount=0; s|j<b#<xQ
CString name; &9_\E{o%]
name.Format("pict%04d.bmp",filecount++); <o7#?AcPu
name=m_Path+name; yXV|4
BITMAPFILEHEADER bfh; (g/X(3
bfh.bfReserved1=bfh.bfReserved2=0; AJ`
v
bfh.bfType=((WORD)('M'<< 8)|'B'); AV 5\W}
bfh.bfSize=54+size; O;e8ft
'|
bfh.bfOffBits=54; e_k
_ty`
CFile bf; FT/5 _1i
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o-=d|dWG
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); FNm6/_u3
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XVDd1#h
bf.WriteHuge(lpData,size); +%qSB9_>N{
bf.Close(); QiE<[QP{g
nCount++; Gz|%;
} x~9z`d{!
GlobalFreePtr(lpData); Ipz
1+
#s'
if(nCount==1) d6@jEa-
m_Number.Format("%d picture captured.",nCount); #O9*$eMw
else k\c &2T]W
m_Number.Format("%d pictures captured.",nCount); EcU'*
UpdateData(FALSE); -iDEh_pts
} b({Nf,(a2
|] !o*7"4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mOgOHb2
{ q$?7
~*M;x
if(pMsg -> message == WM_KEYDOWN) uz#PBV8Q
{ q _]
if(pMsg -> wParam == VK_ESCAPE) U 'CfP9=
return TRUE; myWmU0z/
if(pMsg -> wParam == VK_RETURN) {pe7]P?
return TRUE; HCx%_9xlm
} 'ztL3(|X6
return CDialog::PreTranslateMessage(pMsg); Vo 6y8@\
} B3>Uba*-)}
\l]pe|0EW
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'y6!%k*
{ {y&\?'L'
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a()6bRc~T
SaveBmp(); BgkB x
return FALSE; 9Z0CF~Y5
} 9]L! .
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [7e{=\`=
CMenu pop; 02W4-*)
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]]uzl0LH
CMenu*pMenu=pop.GetSubMenu(0); >C:"$x2"#(
pMenu->SetDefaultItem(ID_EXITICON); Z;fm;X%4
CPoint pt; 0Z
A#T:4
GetCursorPos(&pt);
'9 *|N=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c{,y{2c]LT
if(id==ID_EXITICON) =X`]Ct8Z
DeleteIcon(); /NW>;J}C
else if(id==ID_EXIT) Im?= e
OnCancel(); tt7PEEf
return FALSE; gVa+.x]
} 3|K=%jr[
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -7k|6"EwM
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K$<`4#i
AddIcon(); 5%QC
][,
return res; =XMD+
} hJ;f1dZ7}
s!@=rq
void CCaptureDlg::AddIcon() {UdcX~\~
{ AB2mt:^
NOTIFYICONDATA data; \ W
'i0+
data.cbSize=sizeof(NOTIFYICONDATA); CGd[3}"
CString tip; GJC!0{8;
tip.LoadString(IDS_ICONTIP); *(d6Z#
data.hIcon=GetIcon(0); 8O8\q
;US
data.hWnd=GetSafeHwnd(); d2C[wQF
strcpy(data.szTip,tip); }fJ:wku
data.uCallbackMessage=IDM_SHELL; rnn2u+OG
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Y]~ HAv '
data.uID=98; ]27>a"p59Y
Shell_NotifyIcon(NIM_ADD,&data); FJa[ToZ4+
ShowWindow(SW_HIDE); U]V3DDN
bTray=TRUE; I|KY+k> /
} 8h&oSOkQk,
hv$uH7Fz
void CCaptureDlg::DeleteIcon() fiE>H~
{ G2CZwm{/f
NOTIFYICONDATA data; 5)d,G9
data.cbSize=sizeof(NOTIFYICONDATA); sf |oNOz
data.hWnd=GetSafeHwnd(); y+4?U
data.uID=98; }BI~am_
Shell_NotifyIcon(NIM_DELETE,&data); ,DQGv_
ShowWindow(SW_SHOW); L$Hx?^3
SetForegroundWindow(); {cR_?Y@
ShowWindow(SW_SHOWNORMAL); a=J@yK
bTray=FALSE; iK5]y+@8
} +{,N X
Vs_\ykO
void CCaptureDlg::OnChange() r6d0x
{ k4qLB1&,
RegisterHotkey(); z5XYpi_;[
} _M8G3QOx
Z/2,al\
BOOL CCaptureDlg::RegisterHotkey() 3]O`[P,*%
{ IL~]m?'V(
UpdateData(); P0%N
Q1bn
UCHAR mask=0; n-b>m7O(
UCHAR key=0; S}oG.r
9
if(m_bControl) 7?6xPKQ)H
mask|=4; e[x?6He,$
if(m_bAlt) A Gv!c($
mask|=2; r NxrQ
if(m_bShift) K\RWC4
mask|=1; Pm$F2YrO3
key=Key_Table[m_Key.GetCurSel()];
#4vV%S
if(bRegistered){ `Y\gSUhzS
DeleteHotkey(GetSafeHwnd(),cKey,cMask); yGb a
bRegistered=FALSE; :3f-9aRC!
} S~+O`y^
cMask=mask; E2^ KK:4s
cKey=key; Uc_jQ4e_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U7^7/s/.
return bRegistered; .:w#&yM [U
} f ,tW_g
\hs/D+MCk
四、小结 ppAmN0=G
oR*ztM
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。