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:
4BF
\-lq~
]@LeyT'cY 一、实现方法
}ADdKK-
.nh }f}j 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:
Y<0}z>^ n sW# #pragma data_seg("shareddata")
xDJ@MW# HHOOK hHook =NULL; //钩子句柄
1fajTT? UINT nHookCount =0; //挂接的程序数目
%{"v^4 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
E "9` static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
t*J*?Ma static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
XLQt>y) static int KeyCount =0;
ul@G{N{L static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
lqdil l\ #pragma data_seg()
gkkT<hEV= -|_#6-9 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。
"]H_;:{f xb8S)zO]Q 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:
]c/k%]o~ A><w1-X&=o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
re}_+svU cKey,UCHAR cMask)
AIN Fv; {
\;#T.@c5 BOOL bAdded=FALSE;
f0!i<9< for(int index=0;index<MAX_KEY;index++){
b&]_5 GGc if(hCallWnd[index]==0){
r2!\Ts 5v hCallWnd[index]=hWnd;
H 5\k`7R HotKey[index]=cKey;
hJ|zX HotKeyMask[index]=cMask;
gu:8+/W8L bAdded=TRUE;
-]hk2Q0 KeyCount++;
my1FW,3 break;
U0X,g(2' }
gs/ i%O }
}(MI}o} return bAdded;
'\g-z }
ut/3?E1 Z //删除热键
`_;sT8 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,76xa%k(U| {
"|k 4<"] BOOL bRemoved=FALSE;
r~2>_LK for(int index=0;index<MAX_KEY;index++){
VAD9mS^~ if(hCallWnd[index]==hWnd){
E!Ljq 3iT` if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)/87<Y;o hCallWnd[index]=NULL;
9I1D'7wI^^ HotKey[index]=0;
IJ[r!&PY HotKeyMask[index]=0;
-w'_Q"o2 bRemoved=TRUE;
:o"9x, KeyCount--;
?Sj>b break;
THN//}d }
A.YXK%A% }
C
srxi'Pe }
F9}j iCom return bRemoved;
NoAgZ{)) }
Ga$ J7R MrU0Jrk4+ _/c1b>kcso DLL中的钩子函数如下:
\>]C <6rc8jYz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
nhdOo
{
|43dyJW BOOL bProcessed=FALSE;
V$?@
z>7 if(HC_ACTION==nCode)
VZ3{$0
+ {
(/ qOY if((lParam&0xc0000000)==0xc0000000){// 有键松开
Y W9+.Dc` switch(wParam)
'$q=r x {
sF4+(9 = case VK_MENU:
t@vVE{` MaskBits&=~ALTBIT;
%iq8dAW% break;
}mdk+IEt case VK_CONTROL:
qP k`e}D MaskBits&=~CTRLBIT;
$p;<1+! break;
g15~+;33N case VK_SHIFT:
rgw@ MaskBits&=~SHIFTBIT;
x>!bvZ2 break;
[C^&iLX/F* default: //judge the key and send message
UTS.o#d break;
tv 7"4$T }
pNnZ-R|u for(int index=0;index<MAX_KEY;index++){
p}e1!q;N if(hCallWnd[index]==NULL)
Fm#`}K_ continue;
t9eEcqMg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
eQU~A9 {
P _x(`H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IzI2w6a bProcessed=TRUE;
MHqk-4Mz }
`k.0d`3( }
!)4'[5t"U }
kxH`
c else if((lParam&0xc000ffff)==1){ //有键按下
p#aB0H3 switch(wParam)
'ju'O#A9 {
5q,ZH6\
{ case VK_MENU:
xOt
{Vsv MaskBits|=ALTBIT;
wTe 9OFv break;
Q+7+||RW case VK_CONTROL:
SpC6dkxD\ MaskBits|=CTRLBIT;
Zg&o][T break;
5V*R
Dh case VK_SHIFT:
,<s/K MaskBits|=SHIFTBIT;
8pXqgIbmb break;
-P:o ^_)g default: //judge the key and send message
g#%Egb1 break;
{!&^VXZIT }
L_sDbAT~< for(int index=0;index<MAX_KEY;index++){
z 4qEC if(hCallWnd[index]==NULL)
-q30tO. continue;
7 -S?U~s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,4HZ-|EOZ {
[NoO A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
yu}yON bProcessed=TRUE;
Wud-(19 }
kB9@
&t+ }
:/R>0 n, }
5t,X; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
VHm.uL_UW for(int index=0;index<MAX_KEY;index++){
4MrUo9L$s if(hCallWnd[index]==NULL)
wx8Qz,Z continue;
~e_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]&OI.p SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Vg~10Q //lParam的意义可看MSDN中WM_KEYDOWN部分
12@Ge] }
f^)iv
]p }
y!c<P,Lt3f }
dpvEY(Ds return CallNextHookEx( hHook, nCode, wParam, lParam );
w>e+UW25Y }
op($+Q H8kB.D[7Q 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:
~ycWcZi> Vn65:" O BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
26}fB BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
L[^.pO R|92T*h 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:
J1w,;T\55 OX7a72z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
<v!jS=T {
hU3sEOm> if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
_*cKu>,O {
N;a' `l //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
[P|kY SaveBmp();
y eam-8 return FALSE;
Aho-\9/x% }
:31?Z(fQ …… //其它处理及默认处理
Zrzv'; }
DVt^O[ KGGnypx` SmAii}-jf 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。
J!}\v=Rn caxOxRo\ 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。
2%|n}V[ p,tkVedR 二、编程步骤
$b[Ha{9(v Y6T{/! 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
yMD3h$w3a `(/xj{"Fr} 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
KAi_+/]K_ '#>Fe`[ 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;
<\$?.tTZ{ 2D a0*xn{ 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;
OdOn wY e jR_3K^ 5、 添加代码,编译运行程序。
3.9/mztS * \B(- 三、程序代码
+~|Jn_:A f 1<cx!=w' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
1!yd(p=cL #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Z;[xaP\S #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
I2-ue 63 ? #if _MSC_VER > 1000
C^c<s #pragma once
v2a(yH #endif // _MSC_VER > 1000
%&0/Ypp= #ifndef __AFXWIN_H__
^/cqE[V~, #error include 'stdafx.h' before including this file for PCH
HXX9D&c4R #endif
`[e0_g\ #include "resource.h" // main symbols
cB_9@0r[S class CHookApp : public CWinApp
$Ld-lQsL {
9g#
62oIg public:
S(^YTb7 CHookApp();
`GlOl- // Overrides
v$+A! eo // ClassWizard generated virtual function overrides
m2/S(f //{{AFX_VIRTUAL(CHookApp)
s
Ytn'&$\ public:
L,!\PV| virtual BOOL InitInstance();
qu!x#OY+ virtual int ExitInstance();
\t`Vq JLyu //}}AFX_VIRTUAL
wp'[AR} //{{AFX_MSG(CHookApp)
df {\O*6 // NOTE - the ClassWizard will add and remove member functions here.
`t44.=% // DO NOT EDIT what you see in these blocks of generated code !
;JgSA&'e //}}AFX_MSG
s];0-65) DECLARE_MESSAGE_MAP()
X"mPRnE330 };
&/:c?F?l LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
CIsX$W BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N"tX K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
(/Jy9=~ BOOL InitHotkey();
J`C 2}$
~ BOOL UnInit();
(kyRx+gA #endif
LN5BU,4= S6\E
I5S //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
e>6W ^ ) #include "stdafx.h"
MmU`i ,z #include "hook.h"
vl6|i)D #include <windowsx.h>
<%W&xk #ifdef _DEBUG
st~l|| #define new DEBUG_NEW
iQ1[60?)T #undef THIS_FILE
B*E"yB\NV static char THIS_FILE[] = __FILE__;
+uj;00 D #endif
s<Nw)Ynw #define MAX_KEY 100
Ao*:$:k #define CTRLBIT 0x04
9~2iA,xs #define ALTBIT 0x02
$ %|b6Gr/& #define SHIFTBIT 0x01
/VP #J<6L #pragma data_seg("shareddata")
5\O&pz@D HHOOK hHook =NULL;
XbeT x UINT nHookCount =0;
m(dW["8D static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
&j/,8 Z* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
;Xqi;EA static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
T,Q7 YI static int KeyCount =0;
j|qdf3^f static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]/3!t=La #pragma data_seg()
j9w{=( MV HINSTANCE hins;
~(NFjCUY? void VerifyWindow();
E7.{SGH} BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=h?%<2t9< //{{AFX_MSG_MAP(CHookApp)
^y93h8\y // NOTE - the ClassWizard will add and remove mapping macros here.
n=0^8QQ
// DO NOT EDIT what you see in these blocks of generated code!
%F$]v //}}AFX_MSG_MAP
k8SY=HP END_MESSAGE_MAP()
s<:);-tL [H9<JdUZ CHookApp::CHookApp()
"(~fl<; {
!\$4A, // TODO: add construction code here,
ep`8LQf // Place all significant initialization in InitInstance
ti]8_vP}* }
7fd,I% v xc05GJ CHookApp theApp;
%kH,Rl\g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
hY *^rY' {
u@+^lRGFh BOOL bProcessed=FALSE;
VP ?Q$?a if(HC_ACTION==nCode)
}N,v&B {
$RHw6*COG if((lParam&0xc0000000)==0xc0000000){// Key up
4(Y-TFaf switch(wParam)
[iyhrc:@ {
hh.`Yu L case VK_MENU:
M:d|M|' MaskBits&=~ALTBIT;
5nmE*( break;
?i!d00X case VK_CONTROL:
V=PK)FJ MaskBits&=~CTRLBIT;
An,TunX break;
Pp4Q)2X case VK_SHIFT:
<iH"5DEe MaskBits&=~SHIFTBIT;
bHTTxZ-% break;
<K/iX%b? default: //judge the key and send message
se bm break;
{n<1uh9~$8 }
-
s{&_]A~ for(int index=0;index<MAX_KEY;index++){
_?bF;R if(hCallWnd[index]==NULL)
6$csFW3R continue;
EIg:@o&Jj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
SpEu>9g& {
[Z1,~(3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
g`"_+x' bProcessed=TRUE;
Q%V530
P; }
c.>OpsF }
$UdFm8& }
=;?Maexp3$ else if((lParam&0xc000ffff)==1){ //Key down
'(3|hh)Tl switch(wParam)
F7=&CW 0 {
)Q|sW+AF case VK_MENU:
PBwKR D[I MaskBits|=ALTBIT;
.[6T7fdi break;
xp\6,Jyh case VK_CONTROL:
A2`Xh#o MaskBits|=CTRLBIT;
RNcnE1= break;
!4$o*{9Lx: case VK_SHIFT:
i*+N[#yp MaskBits|=SHIFTBIT;
^c){N-G break;
VlxHZ default: //judge the key and send message
'puiahA break;
U/\LOIs }
Cg^1(dBd[9 for(int index=0;index<MAX_KEY;index++)
U{9yfy {
Y1{*AV6ev6 if(hCallWnd[index]==NULL)
-}H
EV#ev continue;
8Tp!b
%2. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D}nRH@<` {
(
D@U% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
{9nH#yv bProcessed=TRUE;
aR%E"P-6l }
EOzw&M];r }
uu;1B.[b }
|,WP) if(!bProcessed){
]seOc],4 for(int index=0;index<MAX_KEY;index++){
>4]y)df5 if(hCallWnd[index]==NULL)
i
3i continue;
XywsjeI4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X.J$
5b SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
y}GFtRNG }
M|}V6F_y }
,]_<8@R }
J6RzN'j return CallNextHookEx( hHook, nCode, wParam, lParam );
p{oc}dWin }
Wr;9Mz&{ 7~m[:Eg6[s BOOL InitHotkey()
X@H/"B%u2 {
JbXd9AMh2 if(hHook!=NULL){
{&0u:
nHookCount++;
ytyB:# J return TRUE;
Y [%<s/ }
"-:-!1;Ji else
i.0.oy> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]jgMN7 if(hHook!=NULL)
rIQ%X`Y nHookCount++;
k8E{pc6; return (hHook!=NULL);
Vi'zSR28Z }
kB-]SD# BOOL UnInit()
Y>SpV_H% {
g1&>.V}! if(nHookCount>1){
,j e nHookCount--;
X|dlVNL8p return TRUE;
v?(z4oOD/> }
xzz0uk5
BOOL unhooked = UnhookWindowsHookEx(hHook);
HJjx!7h if(unhooked==TRUE){
6d/1PGB nHookCount=0;
e&-MP;kgW9 hHook=NULL;
;C,t`( }
{iYrC m[_ return unhooked;
WYd9p; k }
2"IDz01ne t_w2J =2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rk
&ME#<r {
B,U|V BOOL bAdded=FALSE;
=B0AG9Fz for(int index=0;index<MAX_KEY;index++){
8,-U`. if(hCallWnd[index]==0){
N^4CA@'{ hCallWnd[index]=hWnd;
:pvB}RYD HotKey[index]=cKey;
pMd!Jl#(N
HotKeyMask[index]=cMask;
(Rh$0^)A bAdded=TRUE;
G.]'pn KeyCount++;
z-_$P)[c break;
HsKq/Oyk }
.S*VYt%K7 }
L [&|<<c
return bAdded;
?D;7ut$~ }
WOi+y Q[)3r
,D BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Jk;dtLL}4 {
M}]4tAyT BOOL bRemoved=FALSE;
KzQuLD(e for(int index=0;index<MAX_KEY;index++){
lofP$ if(hCallWnd[index]==hWnd){
~ DP5Qi if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
lJdrrR)wg hCallWnd[index]=NULL;
Qt>Bvu Q HotKey[index]=0;
BvP++,a&Sa HotKeyMask[index]=0;
CbFO9q bRemoved=TRUE;
hWi2S!*Y KeyCount--;
2TgS
) break;
%xA-j]%?ep }
`=%G&_3_< }
ogqKM_ }
\%_sL#? return bRemoved;
Kx02 2rgDU }
a fLE9 )JY#8,{w void VerifyWindow()
08/Tk+ {
Q5]rc`}
5 for(int i=0;i<MAX_KEY;i++){
5xQ5)B4k if(hCallWnd
!=NULL){ .E;}.X
if(!IsWindow(hCallWnd)){ 9M-W 1prb
hCallWnd=NULL; `yh][gqVE~
HotKey=0; GJ:oUi
HotKeyMask=0; m[v%Qe|~
KeyCount--; ! LCy:>i!d
} KQ0f2?
} udPLWrPF\
} pm2]
} f8-~&N/_R
B<ZCuVWH:
BOOL CHookApp::InitInstance() D;z!C
ys
{ qp{~OW3
AFX_MANAGE_STATE(AfxGetStaticModuleState()); nfh<3v|kvR
hins=AfxGetInstanceHandle(); !QCErE;r
InitHotkey(); 8 %p+:6kP5
return CWinApp::InitInstance(); ),H1z`c&I
} E:;MI{;7
~MP/[,j`
int CHookApp::ExitInstance() EqOhz II^
{ yq!peFu
VerifyWindow(); Y=,9 M
UnInit(); Gn4XVzB`O
return CWinApp::ExitInstance(); b>]UNf"-
} >^SQrB
BZIU@^Q_Y[
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lT~WP)
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k"E|E";B
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8mt#S
#if _MSC_VER > 1000 %S^:5#9
#pragma once .g94|P
#endif // _MSC_VER > 1000 _#we1m
op3a*KG
class CCaptureDlg : public CDialog k>~D
{ Kd\d>&b
// Construction X9?0`6Li
public: HY;kV6g{P
BOOL bTray; ?5F;4oR2g
BOOL bRegistered; 3Kq/V_
BOOL RegisterHotkey(); ru|*xNXKgC
UCHAR cKey; _|{Z850AS
UCHAR cMask; 5g.Kyj|
void DeleteIcon(); g ;XK3R
void AddIcon(); GyVuQ51
UINT nCount; CZ>Ujw=&k
void SaveBmp(); qRz /$|.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ( X+2vN
// Dialog Data S;oRE'kk
//{{AFX_DATA(CCaptureDlg) J&B5Ll
enum { IDD = IDD_CAPTURE_DIALOG }; I9xkqj
CComboBox m_Key; FI~=A/:
BOOL m_bControl; :ciD!Ly
BOOL m_bAlt; -Ir>pY\!
BOOL m_bShift; E33WT{H&_'
CString m_Path; <9c{Kt.5(
CString m_Number; 24wr=5p]Q
//}}AFX_DATA K[x=knFO
// ClassWizard generated virtual function overrides "p+JME(
//{{AFX_VIRTUAL(CCaptureDlg) ]f}(iD
public: X~/-,oV=A
virtual BOOL PreTranslateMessage(MSG* pMsg); [.6bxK
protected: B
]sVlbt
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M.bkFuh
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?}= $zN
//}}AFX_VIRTUAL ~_IQ:]k
// Implementation Z~[eG"6zI
protected: 4~8-^^
HICON m_hIcon; TX7dwmt)N
// Generated message map functions sHPj_d#
//{{AFX_MSG(CCaptureDlg) "<f?.l\+
virtual BOOL OnInitDialog(); L(9AcP
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (*,R21<%
afx_msg void OnPaint(); e_g&L)
afx_msg HCURSOR OnQueryDragIcon(); BqDsf5}jpA
virtual void OnCancel(); JB=L{P J
afx_msg void OnAbout(); 43 <i3O
afx_msg void OnBrowse(); <9T,J"y
afx_msg void OnChange(); L+eK)Q
//}}AFX_MSG KHGUR(\Rd6
DECLARE_MESSAGE_MAP() )*Wz5x
}; 8VuLL<\|
#endif 0k4XVd+Nv
[k&7h,
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ):A.A,skf
#include "stdafx.h" _;:_ !`
#include "Capture.h" [;o>q;75Jz
#include "CaptureDlg.h" sbFIKq]
#include <windowsx.h> t~BWN
#pragma comment(lib,"hook.lib") vsQvJDna~
#ifdef _DEBUG l3/Cj^o4
#define new DEBUG_NEW }*O8]lG
#undef THIS_FILE @\M^Zuo
static char THIS_FILE[] = __FILE__; =k;X}/
#endif /!y;h-
#define IDM_SHELL WM_USER+1 [nlq(DGJhp
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )-Z*/uF^
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q8,,[R_
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .F[5{XV
class CAboutDlg : public CDialog k_?~@G[I
{ wDW/?lT&
public: 5+j):_
CAboutDlg(); 3(gOF&Uf9
// Dialog Data .[1@wW&L
//{{AFX_DATA(CAboutDlg) 8*|*@
enum { IDD = IDD_ABOUTBOX }; 2=%]Ax"R
//}}AFX_DATA 6Q{OM:L/;.
// ClassWizard generated virtual function overrides 51*[Ibx
//{{AFX_VIRTUAL(CAboutDlg) z4zPR?%:
protected: z46Sh&+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "
RIt
//}}AFX_VIRTUAL oa[O~z{~
// Implementation .Yz^r?3t
protected: e AaS }g
0
//{{AFX_MSG(CAboutDlg) &7\fj
//}}AFX_MSG *i!t&s
DECLARE_MESSAGE_MAP() ^t$uDQ[hA
}; @W~aoq6
QIJ/'72
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dP>FXgY
{ {<#b@=G
//{{AFX_DATA_INIT(CAboutDlg) |CQ0{1R1
//}}AFX_DATA_INIT 9E4^hkD&
} 2Uu!_n}tNF
7{9M
^.}
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L|;sB=$'{
{ i CB:p
CDialog::DoDataExchange(pDX); Uv~|Xj4.
//{{AFX_DATA_MAP(CAboutDlg) P:%b[7
//}}AFX_DATA_MAP Xn>>hzj-x?
} s?4nR:ZC}
#.C2_MN>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1s(i\&B
//{{AFX_MSG_MAP(CAboutDlg) [$:L|V!{
// No message handlers Y^;izM}
//}}AFX_MSG_MAP
bf2r8
END_MESSAGE_MAP() E}<i?;
| h+vdE8
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ] ;CJ6gM~
: CDialog(CCaptureDlg::IDD, pParent) 8!@}\6qM
{ .MID)PY-
//{{AFX_DATA_INIT(CCaptureDlg) v!$?;"d+
m_bControl = FALSE; @Pi]kWW})
m_bAlt = FALSE; nHp(,'R/
m_bShift = FALSE; m}S}fH(
m_Path = _T("c:\\"); |WfL'_?$
m_Number = _T("0 picture captured."); H<P d&
nCount=0; #\ysn|!J,
bRegistered=FALSE; >hV2p/D
bTray=FALSE; 0;`+e22
//}}AFX_DATA_INIT Cb.M
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ww#!-,*]o
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d\tY-X3
} BMV\@Sg
Y]uVA`%"b
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z+[W@5q
{ D(&WEmm\B
CDialog::DoDataExchange(pDX); cRNVqMpg
//{{AFX_DATA_MAP(CCaptureDlg) f&RjvVP?s
DDX_Control(pDX, IDC_KEY, m_Key); gr{*wYL
DDX_Check(pDX, IDC_CONTROL, m_bControl); Y>~jho
DDX_Check(pDX, IDC_ALT, m_bAlt); XD_!5+\H1
DDX_Check(pDX, IDC_SHIFT, m_bShift); _={mKKoHs
DDX_Text(pDX, IDC_PATH, m_Path); OPogH=vf
DDX_Text(pDX, IDC_NUMBER, m_Number); N|ZGc{?
//}}AFX_DATA_MAP 'iDkAmvD
} ?du*ITim
_#{qDG=
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {LCKt/Z>P
//{{AFX_MSG_MAP(CCaptureDlg) D]|{xK C}
ON_WM_SYSCOMMAND() D";clP05K
ON_WM_PAINT() sBqOcy
ON_WM_QUERYDRAGICON() 4T
v=sP
ON_BN_CLICKED(ID_ABOUT, OnAbout) gkKNOus
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sOS^
ON_BN_CLICKED(ID_CHANGE, OnChange) nNnfcA&W
//}}AFX_MSG_MAP xe3Jxo!U
END_MESSAGE_MAP() 3a=\$x@
i*A_Po
BOOL CCaptureDlg::OnInitDialog() yx ;K&>
{ 8LXK3D}?3
CDialog::OnInitDialog(); `9P`f4x
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); kf9]nIo
ASSERT(IDM_ABOUTBOX < 0xF000); P 6=5:-Hh
CMenu* pSysMenu = GetSystemMenu(FALSE); C',uY7}<
if (pSysMenu != NULL) 1F3Q^3+
{ :_,3")-v
CString strAboutMenu; R|Uu
strAboutMenu.LoadString(IDS_ABOUTBOX); -C!m#"PDW
if (!strAboutMenu.IsEmpty()) wByTNA7
{ Nei i$
pSysMenu->AppendMenu(MF_SEPARATOR); MIWc
@.i2
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); s vS)7]{cU
} }9;mtMR$
} 8qxZ7|Y@
SetIcon(m_hIcon, TRUE); // Set big icon M
8(w+h{
SetIcon(m_hIcon, FALSE); // Set small icon soX^$l
m_Key.SetCurSel(0); \pSRG=`
RegisterHotkey(); j7NOYm5N
CMenu* pMenu=GetSystemMenu(FALSE); av:%wJUl,$
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,wv>G]v
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0V`~z-#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8+32hg@^F
return TRUE; // return TRUE unless you set the focus to a control we@*;k@_
} U!JmSP
A6
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @3FQMs4
{ LW">9;n
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?wn<F}UH
{ :7(d6gEL
CAboutDlg dlgAbout; 7| j
rk
dlgAbout.DoModal(); t2rZ%[O
} r@wE?hK
else %*IH~/Ld;]
{ `49!di[
CDialog::OnSysCommand(nID, lParam); 3Ljj|5.q
} F5M|QX@-
} 9F~5Ht
dP]Z:
void CCaptureDlg::OnPaint() K5??WB63B
{ <DII%7q,6/
if (IsIconic()) PGVP0H+RV
{ U#XW}T=|
CPaintDC dc(this); // device context for painting :/RvtmW
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~~I]SI k{
// Center icon in client rectangle AgUjC
int cxIcon = GetSystemMetrics(SM_CXICON); =GeGlI6
int cyIcon = GetSystemMetrics(SM_CYICON); z=8l@&hYLq
CRect rect; mD*!<<Sw
GetClientRect(&rect); P4c}@Mq3
int x = (rect.Width() - cxIcon + 1) / 2; bQI.Qk
int y = (rect.Height() - cyIcon + 1) / 2; w6^TwjjZ$
// Draw the icon (Fq]y5
dc.DrawIcon(x, y, m_hIcon); oU*e=uehj
} Y ._Om}H
else -B-HZ_
{ C]ax}P>BQ
CDialog::OnPaint(); M*~X pT3
} =CCddLO
} s5MG#M 9
[[]NnWJ
HCURSOR CCaptureDlg::OnQueryDragIcon() + EKp*Vje
{ 6{fo.M?
return (HCURSOR) m_hIcon; z(>:LX"xz
} <7/7+_y
t_(S e
void CCaptureDlg::OnCancel() :r{W)(mm
{ 7ks!0``
if(bTray) /1= x8Sb
DeleteIcon(); n^l5M^.
CDialog::OnCancel(); I+jc
} |O"Pb`V+
'gsO}xj
void CCaptureDlg::OnAbout() H$
:BJ$x@
{ (dV7N
CAboutDlg dlg; RL/5o"
dlg.DoModal(); H;Gs0Qi;
} Lu[Hz8
v^[!NygShs
void CCaptureDlg::OnBrowse() *0r!eD
{ HPo><u
CString str; /^WawH6)6
BROWSEINFO bi; -;i:bE
char name[MAX_PATH]; F>%,}Y~B:
ZeroMemory(&bi,sizeof(BROWSEINFO)); 2<V`
bi.hwndOwner=GetSafeHwnd(); wGHVq
fm5
bi.pszDisplayName=name; ^a!oq~ZSy
bi.lpszTitle="Select folder"; ?3v-ppw%
bi.ulFlags=BIF_RETURNONLYFSDIRS; 87KSV"IU8
LPITEMIDLIST idl=SHBrowseForFolder(&bi); UM0#S}
if(idl==NULL) Kf$6D 79#
return; x@>~&eP
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8%MF<
str.ReleaseBuffer(); =Fq{#sC>
m_Path=str; 4r7aZDVA\
if(str.GetAt(str.GetLength()-1)!='\\') OXX D}-t
m_Path+="\\"; hIa,PZ/Q
UpdateData(FALSE); H3Zt3l1u+
} 1Eryw~,,9i
eV0eMDY5
void CCaptureDlg::SaveBmp() ?tT89m3_E
{ FE1En
CDC dc; v)*eLX$
dc.CreateDC("DISPLAY",NULL,NULL,NULL); a"k,x-EL(
CBitmap bm; Ct3+ga$
int Width=GetSystemMetrics(SM_CXSCREEN); "#Q"gC.K
int Height=GetSystemMetrics(SM_CYSCREEN); -YipPo"a
bm.CreateCompatibleBitmap(&dc,Width,Height); 0-d&R@lX.
CDC tdc; 1d&Q
E\2}
tdc.CreateCompatibleDC(&dc); ^6!8)7b
CBitmap*pOld=tdc.SelectObject(&bm); Lr`Gyl62
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wvr`~ e
tdc.SelectObject(pOld); |I.5]r-EK
BITMAP btm; GB6(WAmr
bm.GetBitmap(&btm); +>%AG&Pc
DWORD size=btm.bmWidthBytes*btm.bmHeight; 'sk M$jr
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;b_<5S
BITMAPINFOHEADER bih; Xxm7s S
bih.biBitCount=btm.bmBitsPixel; V:AA{<
bih.biClrImportant=0; ^[2siG
bih.biClrUsed=0; ]Rmu+N|
bih.biCompression=0; F5w=tK
bih.biHeight=btm.bmHeight; =[gFaB_H
bih.biPlanes=1; V:g XP1P
bih.biSize=sizeof(BITMAPINFOHEADER); c&`]O\D-c
bih.biSizeImage=size; QX.U:p5C
bih.biWidth=btm.bmWidth; 8yuTT^
bih.biXPelsPerMeter=0; Imo?)dYK
bih.biYPelsPerMeter=0; :a( Oc'T
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); pT;xoe
static int filecount=0; BbzIQg:
CString name;
x\G<R; Q
name.Format("pict%04d.bmp",filecount++); mx2Ov u
name=m_Path+name; 7~H$p X
BITMAPFILEHEADER bfh; ;$4:
&T
bfh.bfReserved1=bfh.bfReserved2=0; QCfR2Nn}
bfh.bfType=((WORD)('M'<< 8)|'B'); F@ZB6~T~.
bfh.bfSize=54+size; j~hvPlho
bfh.bfOffBits=54; ]\3<UL
CFile bf; hXx:D3h
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ a1v?{vu\E
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @ZcI]G%
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !zfV(&
bf.WriteHuge(lpData,size); j<L!(6B
bf.Close(); O%Qz6R
nCount++; sWP_fb1
} #*}cc
GlobalFreePtr(lpData); rFto1m
if(nCount==1) miY=xwK&
m_Number.Format("%d picture captured.",nCount); EDA6b]
else b|Eo\l2
m_Number.Format("%d pictures captured.",nCount); 3E8 Gh>J_
UpdateData(FALSE); 01+TVWKX
} C3C&hq\%
`O?j -zR
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W{kTM4
{ [Lf8*U"
if(pMsg -> message == WM_KEYDOWN) 4&B|rf
{ S&'-wAEd
if(pMsg -> wParam == VK_ESCAPE) LO)QEUG
return TRUE; zR}vR9Ls
if(pMsg -> wParam == VK_RETURN) tz%H1`
return TRUE; m khp@^5
} ,u.A[{@py
return CDialog::PreTranslateMessage(pMsg); 1kh()IrA
} ^pocbmg
(abtCuZ8z
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1]7v3m
{ p4Xhs@.k
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kyD*b3MN
SaveBmp(); NcIr;
}
return FALSE; k,r}X:<6jz
} LlbE]_Z!U%
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VS5D)5w#
CMenu pop; U
H6
Jvt
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kg$w<C@#"
CMenu*pMenu=pop.GetSubMenu(0); sg_%=;
pMenu->SetDefaultItem(ID_EXITICON); bX+"G}CRP
CPoint pt; H$xUOqL
GetCursorPos(&pt); =K9-
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FF30VlJ
if(id==ID_EXITICON) /I0}(;^y
DeleteIcon(); %nj{eT
else if(id==ID_EXIT) sfCU"O2G
OnCancel(); ^<Sy{KY
return FALSE; t\-;n:p-
} sTECNY=l
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z7dV y8J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )oMMDHw\
AddIcon(); M` |E)Y
return res; lZD"7om
} )AAPT7!U
6W N(Tw
void CCaptureDlg::AddIcon() zUJPINDb
{ D (">bR)1
NOTIFYICONDATA data; Jrx]/CM
data.cbSize=sizeof(NOTIFYICONDATA); ^:o^g'Yab
CString tip; DA/\[w?J
tip.LoadString(IDS_ICONTIP); /6#i$\ j
data.hIcon=GetIcon(0); 2S-z$Bi}]
data.hWnd=GetSafeHwnd(); h
x
hl
strcpy(data.szTip,tip); ?"T *{8
data.uCallbackMessage=IDM_SHELL; dijHi
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qD5)AdCGO
data.uID=98; F6
f
Shell_NotifyIcon(NIM_ADD,&data); ,<=_t{^
ShowWindow(SW_HIDE); t~
z;G%a
bTray=TRUE; z;EDyd,O>
} 5f_1 dn
]"U/3dL5
void CCaptureDlg::DeleteIcon() -VZ?
c
{ 8?$XT
NOTIFYICONDATA data; Opf^#6'mq
data.cbSize=sizeof(NOTIFYICONDATA); WI\h@qSB
data.hWnd=GetSafeHwnd(); Hr=?_Un"
data.uID=98; x7c#kU2A&Z
Shell_NotifyIcon(NIM_DELETE,&data); #h2 qrX&+
ShowWindow(SW_SHOW); %Yny/O\e%
SetForegroundWindow(); UAtdRVi]M
ShowWindow(SW_SHOWNORMAL); r-c1_
[Q#
bTray=FALSE; [J43]
} r?=3TAA
nb U?:=P
void CCaptureDlg::OnChange() >2LlBLQ
{ Trml?zexD
RegisterHotkey(); .\|}5J9W
} 6G?7>M
a O(&<
BOOL CCaptureDlg::RegisterHotkey() $WZHkV
{ -o`|A767
UpdateData(); MF4B 2d
UCHAR mask=0; :.W</o~\s
UCHAR key=0; rJc=&'{&)N
if(m_bControl) *&rV}vVP^
mask|=4; g42Z*+P6N
if(m_bAlt) Ip;;@o&D
mask|=2; =}YaV@g<f
if(m_bShift) e2MjV8Bs
mask|=1; P~ 7p~ke
key=Key_Table[m_Key.GetCurSel()]; i4r8146D[
if(bRegistered){ (G`O[JF
DeleteHotkey(GetSafeHwnd(),cKey,cMask); NGOyd1$7N
bRegistered=FALSE; w]=c^@t_
} bd@1j`i
cMask=mask; dEG1[QG
cKey=key; ^9A,j}>o-
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +a}>cAj*
return bRegistered; +n&9ZCH
} &)#bdt[
#x[3@zP.
四、小结 8/`ij?gn
AG(Gtvw
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。