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:
c;X,-Q9
,C><n
kx 一、实现方法
2P8wvNDG fvH{va. 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:
M$@~|pQ< F$
G)vskd #pragma data_seg("shareddata")
2 G*uv+= HHOOK hHook =NULL; //钩子句柄
SDE+"MjBY UINT nHookCount =0; //挂接的程序数目
yc3/5]E& static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
u1y>7,Z6W static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
2/V%jS[4#y static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
p2rT0gu! static int KeyCount =0;
tl!dRV92 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
#9[> #pragma data_seg()
xcmg3:s H9ES|ZJs 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。
!\1)?&y9j 9,_~qWw 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:
_,(s F>#F@j^c BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
D>W&#A8&y cKey,UCHAR cMask)
u4xtlGt5 {
H{5,
-x BOOL bAdded=FALSE;
1irSI,j%z for(int index=0;index<MAX_KEY;index++){
#\Y`? if(hCallWnd[index]==0){
{X?1}5ry hCallWnd[index]=hWnd;
$},XRo&R HotKey[index]=cKey;
W
=Bw*o- HotKeyMask[index]=cMask;
l#^?sbG bAdded=TRUE;
{p/Yz# KeyCount++;
j[dZ*Jr_ break;
zo"L9&Hzo }
Un)Xe }
^ /G ; return bAdded;
L(Twclrb }
%au>D //删除热键
qQDe'f~ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zT&"rcT"> {
+3zQ"lLD^ BOOL bRemoved=FALSE;
1I69O6" for(int index=0;index<MAX_KEY;index++){
A+dx7anUz if(hCallWnd[index]==hWnd){
N.z2eo if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+l)t5Mg\ hCallWnd[index]=NULL;
&XcPHZy' HotKey[index]=0;
4<UAT|L^` HotKeyMask[index]=0;
Pm2LB<qS bRemoved=TRUE;
0F- +)S?M[ KeyCount--;
9RJ#zUK break;
EHf,VIC8 }
ZLKbF9lo }
>S }X)4 }
}qp)VF return bRemoved;
Gchs$^1`t }
qP;1LAX K7JZUS`C! 9QHj$)?k, DLL中的钩子函数如下:
#P}n+w_@ )ej1)RU" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
f!YlYk5 {
-:=m-3*Tg BOOL bProcessed=FALSE;
#U%HGTE0 if(HC_ACTION==nCode)
`.~S/$a.& {
7@gH{p1 if((lParam&0xc0000000)==0xc0000000){// 有键松开
^}vf switch(wParam)
nTGf {
d\3 %5Y case VK_MENU:
5p~5-_JX MaskBits&=~ALTBIT;
=EYgck;) break;
S`b!sT-sD case VK_CONTROL:
;J+iwS*Z MaskBits&=~CTRLBIT;
(c}!gjm break;
.Y7Kd+)s)L case VK_SHIFT:
L |#0CRiN MaskBits&=~SHIFTBIT;
\/ri|fm6l# break;
5
Slz^@n default: //judge the key and send message
t D
8l0 break;
1|G\&T }
;!
?l8R for(int index=0;index<MAX_KEY;index++){
7O|`\&RYR if(hCallWnd[index]==NULL)
W-r^ME continue;
6l4= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:!CnGKgt {
(?(gz#- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`IBNBJy bProcessed=TRUE;
kUGFg{" }
K5`*Y@ }
$u, 6x~> }
YhRy
C*b else if((lParam&0xc000ffff)==1){ //有键按下
=IX-n$d`> switch(wParam)
(
6zu*H) {
j7w9H/XF} case VK_MENU:
l0t(t*[Mj MaskBits|=ALTBIT;
T3=h7a %= break;
{)b case VK_CONTROL:
"R)n1,0 MaskBits|=CTRLBIT;
wS,fj gX break;
[8Z#HjhQ case VK_SHIFT:
cQd?,B3#F MaskBits|=SHIFTBIT;
0'A"]6 break;
}JQy&V% default: //judge the key and send message
&|'yqzS3 break;
dJrUcZBr }
Qp:m=f6@ for(int index=0;index<MAX_KEY;index++){
(4q/LuP^d if(hCallWnd[index]==NULL)
J1gnR continue;
:F[s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[h
B$%i]\< {
Z 369< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4|cRYZj5 bProcessed=TRUE;
^A\(M%*F }
R64f0NK. }
6Xo "?f }
7 J6Z? if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
RRQv<x for(int index=0;index<MAX_KEY;index++){
)+,h}XqlX if(hCallWnd[index]==NULL)
/4 Kd continue;
^ @=4HtA if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
iYYuZ. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/|&4&$ //lParam的意义可看MSDN中WM_KEYDOWN部分
tG9C(D`G }
Hiwij,1 }
jvR(e" }
as/PM" return CallNextHookEx( hHook, nCode, wParam, lParam );
I} Q+{/?/ }
S"^'ksL\ `) ],FE*: 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:
Q qj9o2 {gu3KV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(w"(RM~ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F+BCzsm7$ Zi\ex\ )5 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:
f9y+-GhaD ='1hvv/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
eYkg4 O' {
|-*50j l if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
vy={ziJ {
pNQ7uy //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3gJZlH5IR SaveBmp();
KC:6^h'. return FALSE;
D-i, C~W }
6,~1^g* …… //其它处理及默认处理
#J5_z#-Q; }
:p)^+AF"5 q&6|uV])H Rq?t=7fX) 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。
>P} XCAU Ie _{P&J 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。
p0CPeH CsT&}-C 二、编程步骤
(IjM 0/!0W%f[} 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";
-U_,RMw~ *""W`x
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
DYIp2-K _):@C:6 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;
}$uwAevP{y ;iJxJX\+ 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;
_tjexS' b *0u xvLu 5、 添加代码,编译运行程序。
&~B8~U4% z_KCG2=5 三、程序代码
2Ir*}s2{ C+`V?rp=s ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
QKVOc,Fp7i #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
EX, {1^h #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
#s>'IPc0 #if _MSC_VER > 1000
b&_Ifx_YF #pragma once
Bzt:9hr6BO #endif // _MSC_VER > 1000
}1Mf0S #ifndef __AFXWIN_H__
fiU#\%uJg #error include 'stdafx.h' before including this file for PCH
gzW{h0iRr #endif
^liW*F"UY #include "resource.h" // main symbols
$II~tO class CHookApp : public CWinApp
uz$p'Q {
c(5XT[Tw public:
{=gJGP/}_ CHookApp();
f4d-eXGwx` // Overrides
LIz'hfS! // ClassWizard generated virtual function overrides
{;u+? uY //{{AFX_VIRTUAL(CHookApp)
\K%M.>]vq public:
fshG ~L7S9 virtual BOOL InitInstance();
H*f2fyC1\ virtual int ExitInstance();
kou7_4oS //}}AFX_VIRTUAL
B#5[PX //{{AFX_MSG(CHookApp)
6
A#xFPYY{ // NOTE - the ClassWizard will add and remove member functions here.
~mK+Q%G5 // DO NOT EDIT what you see in these blocks of generated code !
PVljb=8F //}}AFX_MSG
?0JNaf DECLARE_MESSAGE_MAP()
8uW%jG3/ };
7D'D7=Z. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
g$hEVT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
OkT@ _U BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0fUsERr1* BOOL InitHotkey();
@}{uibLD\ BOOL UnInit();
>mEfd=p #endif
OqF8KJnO; d`5AQfL& //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
yn<J>e #include "stdafx.h"
^f"|<r #include "hook.h"
<X& fs*x& #include <windowsx.h>
G'dN<Nw6 #ifdef _DEBUG
4Xt`L"f #define new DEBUG_NEW
/P]N40_@ #undef THIS_FILE
VTyj<6Y static char THIS_FILE[] = __FILE__;
vfm Y>nr #endif
7#9%,6Yi #define MAX_KEY 100
Lg#(?tMp,' #define CTRLBIT 0x04
#&L7FBJ"*v #define ALTBIT 0x02
f:~$x #define SHIFTBIT 0x01
B/n~ $ #pragma data_seg("shareddata")
lHTr7uF( HHOOK hHook =NULL;
!su773vo UINT nHookCount =0;
= iDd{$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
!g=b=YK static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
-F3~X R static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
'(N(k@>{ static int KeyCount =0;
Lz:FR* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
q0vZR"y #pragma data_seg()
KQw>6) HINSTANCE hins;
f4+wP/n& void VerifyWindow();
-O-?hsV)y BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
oEFo7X`t //{{AFX_MSG_MAP(CHookApp)
+`ov1h // NOTE - the ClassWizard will add and remove mapping macros here.
zx.SRs$ // DO NOT EDIT what you see in these blocks of generated code!
ZB/1I;l`c //}}AFX_MSG_MAP
q6>} END_MESSAGE_MAP()
aU[!*n 4Ux nvNF~)mu CHookApp::CHookApp()
e5 zi "~ {
'#,C5*` // TODO: add construction code here,
Ss\?SEq // Place all significant initialization in InitInstance
EdSUBoWF} }
p
Tz]8[^ 5tLb
o CHookApp theApp;
R?- zJ ; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
cN&:V2, {
gm!sLZ!X BOOL bProcessed=FALSE;
V3d$C&<( if(HC_ACTION==nCode)
:h3n[% {
\ n^[!e"` if((lParam&0xc0000000)==0xc0000000){// Key up
koD}o^U# switch(wParam)
BS?$eai@:9 {
du#f_|xG case VK_MENU:
y*US^HJOZ MaskBits&=~ALTBIT;
tXZMr break;
K~S*<? case VK_CONTROL:
ucU7
@j MaskBits&=~CTRLBIT;
+/]*ChrS break;
I'p+9H$ case VK_SHIFT:
Qc PU{#6 MaskBits&=~SHIFTBIT;
y
c 8h}` break;
Tm7LaM default: //judge the key and send message
T.-tV[2 break;
EIyFGCw|U }
Z5)v for(int index=0;index<MAX_KEY;index++){
gMkSl8[ if(hCallWnd[index]==NULL)
0G33hIOS continue;
ux|
QGT2LY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O/d]2<V {
-!li,&,A1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
<8Nr;96IA bProcessed=TRUE;
'RzO`-dr }
'd&4MA 0X }
#e,TS`"eD }
&?Q^i">cZ else if((lParam&0xc000ffff)==1){ //Key down
z5Tsu1c switch(wParam)
GU/-L<g {
#:/27 case VK_MENU:
d"Wuu1tEY MaskBits|=ALTBIT;
uwZ,l-6T break;
X7`-dSVE case VK_CONTROL:
niW"o-} MaskBits|=CTRLBIT;
@7.7+blS"H break;
#M+_Lk3 case VK_SHIFT:
.9,x_\|G* MaskBits|=SHIFTBIT;
UX<-jY#'V break;
c=9A d default: //judge the key and send message
B'`25u_e< break;
Iwh0PfWJ }
2 >j0,2 for(int index=0;index<MAX_KEY;index++)
cs9h\]ZA {
[C<K~ if(hCallWnd[index]==NULL)
hN]l
$Ct continue;
X!'C'3 X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}Q ]-Y : {
h{$k%YJ? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
OJJ [Er1 bProcessed=TRUE;
Wi>m}^}9 }
^~7Mv^A }
3/yt }
)Ho"b if(!bProcessed){
[{[m)Z^ for(int index=0;index<MAX_KEY;index++){
q5'G]j{,Z if(hCallWnd[index]==NULL)
|0}7/^ continue;
~K<h~TNP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
CYwV]lq:s SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\0_jmX]p }
y,ub*-: }
P3Lsfi. }
yg*
#~, return CallNextHookEx( hHook, nCode, wParam, lParam );
O"\_%=X9 }
}Bsh!3D<. BmccSC;o4 BOOL InitHotkey()
m6$&yKQ-=h {
vq+CW?*" if(hHook!=NULL){
7wPI)]$ nHookCount++;
?CC.xE return TRUE;
L=EkY O%\" }
0R[fH else
7Hgn/b[?b hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
KF1iYo>p if(hHook!=NULL)
cg17e nHookCount++;
Jvsy
6R return (hHook!=NULL);
bu_@A^ys }
\=im{(0h BOOL UnInit()
&0%Zb~ts {
Kl%[f jI) if(nHookCount>1){
5p S$rf nHookCount--;
J@E]Fl return TRUE;
~OPBZ# }
l>pB\<LL BOOL unhooked = UnhookWindowsHookEx(hHook);
t!6uz if(unhooked==TRUE){
yI#qkl- nHookCount=0;
]BjYUTNm hHook=NULL;
h-;> v. }
/HhA2 (g% return unhooked;
+_cigxpTc }
CsycR @[ X';qcn_^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h9<PP2.( {
1hgIR^;[b BOOL bAdded=FALSE;
&oB*gGRw=7 for(int index=0;index<MAX_KEY;index++){
]w _&%mB if(hCallWnd[index]==0){
.PVYYhrt hCallWnd[index]=hWnd;
1Td`S1'#yg HotKey[index]=cKey;
FK~wr;[ HotKeyMask[index]=cMask;
R.HvqO bAdded=TRUE;
e@0|fB%2 KeyCount++;
f77W{T4 break;
%aK[Yvo6 }
@<pd@Mpf] }
)e`9U.C return bAdded;
'iZwM>l\ }
<Z 3C&BM ,\P|%yv BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V*Fy@ {
hLgX0QV BOOL bRemoved=FALSE;
GQY"
+xa8] for(int index=0;index<MAX_KEY;index++){
Kb<c||2Nh5 if(hCallWnd[index]==hWnd){
/*Q3=Dse] if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{ >izfG,\ hCallWnd[index]=NULL;
a6./;OC HotKey[index]=0;
9c k"JMla HotKeyMask[index]=0;
(:`4*xK
bRemoved=TRUE;
Tc||96%2^ KeyCount--;
n/Fxjf0W
break;
;7?oJH; }
SH =S> }
cyB+(jLHDs }
4_j_!QH87 return bRemoved;
\EoE/2"< }
-p)`o b- p.g> +7 void VerifyWindow()
wUr(i * {
p19(>|$J for(int i=0;i<MAX_KEY;i++){
m)pHCS if(hCallWnd
!=NULL){ =CD6x=
l6
if(!IsWindow(hCallWnd)){ zc;kNkV#1Y
hCallWnd=NULL; v@[3R7|4
HotKey=0; a B MV6'
HotKeyMask=0; p qpsa'
KeyCount--; /ZabY
} ri59LY y=
} f:~G)
}
&R4?]I
} Aqf91
[c
XfVdYmii
BOOL CHookApp::InitInstance() H@wjZ;R
{ 6IT6EkiT
AFX_MANAGE_STATE(AfxGetStaticModuleState()); @^ YXE,
hins=AfxGetInstanceHandle(); VgYy7\?p
InitHotkey(); Ayqs~&{
return CWinApp::InitInstance(); %pOz%v~
} YB4
ZI
,pTZ/#vP#
int CHookApp::ExitInstance() Qfy_@w]
{ h'h8Mm
VerifyWindow(); qtZzJ>Y
UnInit(); E`^D9:3:)
return CWinApp::ExitInstance(); #'%ii,;wQ
} R,PN?aj
E8sM`2z5
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file FO_}9 <s
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W[)HFh(#
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !BkE-9v?w
#if _MSC_VER > 1000 PP'5ANK
#pragma once RPeH [M^
#endif // _MSC_VER > 1000 J0R{|]W8
N-F&=u}
class CCaptureDlg : public CDialog FN!?o:|(
{ Eb9h9sjv
// Construction =#9#unvE!
public: eza"<uBr
BOOL bTray; e> 9X
BOOL bRegistered; [Ca''JqrA
BOOL RegisterHotkey(); YiuV\al
UCHAR cKey; )#\3c,<Y
UCHAR cMask; >E4,zs@7t
void DeleteIcon(); mMZ{W+"[f
void AddIcon(); L7rr/D
UINT nCount; ^J7q,tvbJ
void SaveBmp(); 9x4z m
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z|a*"@5_
// Dialog Data &4WA/'>R
//{{AFX_DATA(CCaptureDlg) oP56f"BE(
enum { IDD = IDD_CAPTURE_DIALOG }; b1IAp >*2l
CComboBox m_Key; iY@}Q "
BOOL m_bControl; g_l-@
BOOL m_bAlt; 0H +nVR
BOOL m_bShift; %4x0^<k~
CString m_Path; >T[Y>]
CString m_Number; b&h'>(
//}}AFX_DATA B!quj!A
// ClassWizard generated virtual function overrides W%^!<bFk}m
//{{AFX_VIRTUAL(CCaptureDlg) 5,f`5'$
public: ~1*37 w~
virtual BOOL PreTranslateMessage(MSG* pMsg); mk~CE
protected: RF2I_4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jMI30
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [W$Mn.5<s
//}}AFX_VIRTUAL -;"A\2_y
// Implementation cL4Go,)w
protected: #| gh
HICON m_hIcon;
}+/Vk
// Generated message map functions Nes|4Z<
//{{AFX_MSG(CCaptureDlg) r 56~s5A
virtual BOOL OnInitDialog(); Q/Z>w+zh#
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6 A]a@,PC
afx_msg void OnPaint(); Z7y%
afx_msg HCURSOR OnQueryDragIcon(); T^7}Qs9
virtual void OnCancel(); 85|u;Fxf
afx_msg void OnAbout(); /K!f3o+
afx_msg void OnBrowse(); Er@xrhH
afx_msg void OnChange(); _/P;`@
//}}AFX_MSG hTv*4J&@|
DECLARE_MESSAGE_MAP() *<
fJgc"3
}; Pr%KcR ;
#endif M+ <SSi"
z)*{bz]
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8kU(>' ^_:
#include "stdafx.h" Iy*Q{H3[
#include "Capture.h" ckP AH E@
#include "CaptureDlg.h" 16I[z+RG
#include <windowsx.h> X04LAYY_u
#pragma comment(lib,"hook.lib") IpzU=+h
#ifdef _DEBUG e&ZTRgYdi
#define new DEBUG_NEW XHgW9 ;M!
#undef THIS_FILE 4<1V
static char THIS_FILE[] = __FILE__; "X?Zw$gRud
#endif 4n(w{W>
#define IDM_SHELL WM_USER+1 ea$. +
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZWuNl!l>
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}8"i~>>a
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fYZd:3VdC
class CAboutDlg : public CDialog ESIJ QM-[+
{ PK&&Vu2M
public: Xs$a^zZ
CAboutDlg(); p_n$}z
// Dialog Data V{>;Z vj1R
//{{AFX_DATA(CAboutDlg) oIj/V|ByK
enum { IDD = IDD_ABOUTBOX }; Bmt8yR2
//}}AFX_DATA =$^}"}$
// ClassWizard generated virtual function overrides t Jtp1$h
//{{AFX_VIRTUAL(CAboutDlg) [\Aws^fD_
protected: "#8^":,4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w0sy@OF
//}}AFX_VIRTUAL zJ1M$U
// Implementation .pl,ujv
protected: xo
^|d3
//{{AFX_MSG(CAboutDlg) 4UW)XLu6T7
//}}AFX_MSG u0? TMy.%
DECLARE_MESSAGE_MAP() r0&LjH&R
}; FoYs<aER
Ik5-ooZ&{
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5?(dI9A"K
{ 'MyJw*%b]
//{{AFX_DATA_INIT(CAboutDlg) +W-b3R:1>
//}}AFX_DATA_INIT "=40%j0
} K'"s9b8
0$yHO2 f
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2.{<C.BK{
{
}7fzEo`g
CDialog::DoDataExchange(pDX); n@C#,v#^0
//{{AFX_DATA_MAP(CAboutDlg) 'f %oL/,
//}}AFX_DATA_MAP =/ !A
} wax^iL!
XCn;<$3w
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) T2|<YJ=
//{{AFX_MSG_MAP(CAboutDlg) XWz~*@ci
// No message handlers hD,^mru
//}}AFX_MSG_MAP 7n;a_Z0s$
END_MESSAGE_MAP() =q"0GUei3
v=uQ8_0~N
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _ qQ
: CDialog(CCaptureDlg::IDD, pParent)
#^-'q`)
{ b-c6.aKf|
//{{AFX_DATA_INIT(CCaptureDlg) 3_eg'EP.E
m_bControl = FALSE; @ K2N cb7
m_bAlt = FALSE; Mj19;nc0I
m_bShift = FALSE; Fghan.F
m_Path = _T("c:\\"); Skux&'N:
m_Number = _T("0 picture captured."); ^ 6t"A
nCount=0; QqeF
bRegistered=FALSE; %hBw)3;l
bTray=FALSE; j6 _w2
//}}AFX_DATA_INIT NY[48H
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 D[YdPg@-
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +@@( C9
} 'P&r^V\~(/
V*6&GM&
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H3JDA^5
{ 2v*X^2+
CDialog::DoDataExchange(pDX); ]@}@G[e#[
//{{AFX_DATA_MAP(CCaptureDlg) M&/e*Ta5
DDX_Control(pDX, IDC_KEY, m_Key); = j
l(Q
DDX_Check(pDX, IDC_CONTROL, m_bControl); c Ct5m
DDX_Check(pDX, IDC_ALT, m_bAlt); EScy!p\*
DDX_Check(pDX, IDC_SHIFT, m_bShift); !) d
DDX_Text(pDX, IDC_PATH, m_Path); ,
d4i0;2}+
DDX_Text(pDX, IDC_NUMBER, m_Number); _B}QS"A
//}}AFX_DATA_MAP -fK_F6_\]
} ^M1O)
T?-K}PUcQ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .e S* F
//{{AFX_MSG_MAP(CCaptureDlg)
yW_goS0
ON_WM_SYSCOMMAND() TjctK [db@
ON_WM_PAINT() <&t[E0mU
ON_WM_QUERYDRAGICON() H[r6 4~Sth
ON_BN_CLICKED(ID_ABOUT, OnAbout) <g8{LG0
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g-+/zEOUS
ON_BN_CLICKED(ID_CHANGE, OnChange) pl 1CEoe
//}}AFX_MSG_MAP "1ZVuI
END_MESSAGE_MAP() V F"c}
3ZYrNul"
BOOL CCaptureDlg::OnInitDialog() 6<n+p'+n
{ -]Oi/i, {
CDialog::OnInitDialog(); 57U;\L;ZmZ
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -dUXd<=ue
ASSERT(IDM_ABOUTBOX < 0xF000); u,@x7a,z
CMenu* pSysMenu = GetSystemMenu(FALSE); "9H#pj -
if (pSysMenu != NULL) Fi+,omB&
{ 1a},(ZcdX
CString strAboutMenu; x C>>K6Nb
strAboutMenu.LoadString(IDS_ABOUTBOX); -]MZP:s
if (!strAboutMenu.IsEmpty()) mgEZiAV ?
{ TrHUM4
pSysMenu->AppendMenu(MF_SEPARATOR); a'\fS7aE0l
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y3luU&'
} X*:)]p(R
} /9C>{29x!
SetIcon(m_hIcon, TRUE); // Set big icon 7I6&*I
SetIcon(m_hIcon, FALSE); // Set small icon sJLJVSv8c
m_Key.SetCurSel(0); !=+hU/e
RegisterHotkey(); 4f,%@s)zn
CMenu* pMenu=GetSystemMenu(FALSE); @,q<][q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M5LqZyY
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :UsNiR=l
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )$FwB6^
return TRUE; // return TRUE unless you set the focus to a control <ZeZq
} d!q)FRzi
d[KG0E5`
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]<E\J+5K
{ Cx`?}A\%
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9KZLlEk5O
{ l8!n!sC[,
CAboutDlg dlgAbout; X57\sggK
dlgAbout.DoModal(); :B4X/
} ?u M2|Nk
else 9=MxuBl
{ 7ZpU -':
CDialog::OnSysCommand(nID, lParam); -M?s<R[&
} :U#4H;kk~j
} qr7_3
qznd'^[
void CCaptureDlg::OnPaint() fYZ)5xnj
{ '\Hh
if (IsIconic()) '[Ch8Yf\
{ Qc"UTvq
CPaintDC dc(this); // device context for painting >1d`G%KfG
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p< jM%fbZk
// Center icon in client rectangle x-s]3'!L
int cxIcon = GetSystemMetrics(SM_CXICON); \RyW#[(
int cyIcon = GetSystemMetrics(SM_CYICON); X9n},}bJ"
CRect rect; ~G`(=\_0
GetClientRect(&rect); C&KH.h/N
int x = (rect.Width() - cxIcon + 1) / 2; OLxiY r
int y = (rect.Height() - cyIcon + 1) / 2; 0N*~"j;r#M
// Draw the icon 1'[_J
dc.DrawIcon(x, y, m_hIcon); VSa#X |z
} #a"gW,/K
else PaYsn *{})
{ FOd)zU*L2
CDialog::OnPaint(); @phb5
} ?i7}d@636
} V@Fj!/
AE 2>smp5@
HCURSOR CCaptureDlg::OnQueryDragIcon() bIahjxd:
{ N!:&Xz
return (HCURSOR) m_hIcon; 3)+}2
} =;^#5dpt$
^iaG>rvA
void CCaptureDlg::OnCancel() qY$/i#
{ ^<O=<tN\
if(bTray) P mgTTI
DeleteIcon(); E"$AOM?(*i
CDialog::OnCancel(); oefhJM!y
} BliL1"".
ht%:e?@i
void CCaptureDlg::OnAbout() !Wz%Hy:ZK
{ Wr Nm:N
CAboutDlg dlg; Ks@
dlg.DoModal(); U6@j=|q
} ZkZTCb`/l
UFy"hJchO
void CCaptureDlg::OnBrowse() t LZ4<wc
{ *^q%b/ f
CString str; &}G2;O}3
BROWSEINFO bi; TS{ycGY
char name[MAX_PATH]; kG>d^K
ZeroMemory(&bi,sizeof(BROWSEINFO)); 'XHKhpm<
bi.hwndOwner=GetSafeHwnd(); NiQ_0Y}
bi.pszDisplayName=name; 2'zYrdem
bi.lpszTitle="Select folder"; t)Mi,ljY[
bi.ulFlags=BIF_RETURNONLYFSDIRS; ?tLBEoUmKT
LPITEMIDLIST idl=SHBrowseForFolder(&bi); qZ6Mk9@M
if(idl==NULL) Td !7Rx
_
return; Oy^)lF/
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?|t9@r
str.ReleaseBuffer(); H#luG_)
m_Path=str; ErNL^Se1
if(str.GetAt(str.GetLength()-1)!='\\') eS/4g M7%
m_Path+="\\"; z\fmwI
UpdateData(FALSE); 9$pQ|e0tJ
} 4iiW{rh4
~;A36M-[.
void CCaptureDlg::SaveBmp() \,i?WgWv
{ l|c#
CDC dc; P<@V
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1\_S1ZS
CBitmap bm; 5P'<X p
int Width=GetSystemMetrics(SM_CXSCREEN); @3hA\3ot^
int Height=GetSystemMetrics(SM_CYSCREEN); ~al4`:rRx1
bm.CreateCompatibleBitmap(&dc,Width,Height); Qyr^\a;k'
CDC tdc; HH+$rrTT
tdc.CreateCompatibleDC(&dc); oyS43/."
CBitmap*pOld=tdc.SelectObject(&bm); dd +%d
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); spE(s%dgL
tdc.SelectObject(pOld); (c<MyuWb
BITMAP btm; a.r+>44M
bm.GetBitmap(&btm); n.{Ud\|
DWORD size=btm.bmWidthBytes*btm.bmHeight; D.hj9
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); H53dy*wb$
BITMAPINFOHEADER bih; $s*\yam?|
bih.biBitCount=btm.bmBitsPixel; 0Y8Si^T
bih.biClrImportant=0; _{fh/{b1
bih.biClrUsed=0; 1d4?+[)gUv
bih.biCompression=0; "[[9i
bih.biHeight=btm.bmHeight; yaiw|j`A
bih.biPlanes=1; kDAPT_Gid
bih.biSize=sizeof(BITMAPINFOHEADER); u&HLdSHe
bih.biSizeImage=size; 9 -\.|5;:
bih.biWidth=btm.bmWidth; f,'gQ5\ X3
bih.biXPelsPerMeter=0; fZQC'Z>EX
bih.biYPelsPerMeter=0; MY]Z@
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,,hW|CmN30
static int filecount=0; 'w^Md
CString name; tCFXb6Cz
name.Format("pict%04d.bmp",filecount++); ?=X G#we
name=m_Path+name; p,hDZea
BITMAPFILEHEADER bfh; p_x@FA(
bfh.bfReserved1=bfh.bfReserved2=0; %z}{jqD&:X
bfh.bfType=((WORD)('M'<< 8)|'B'); A.@S>H'P
bfh.bfSize=54+size; OaeGukhX&
bfh.bfOffBits=54; w^e5" og]
CFile bf; Q:6i
3 Nr/
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o&
g01t
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YY\$lM
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dX4"o?KD>
bf.WriteHuge(lpData,size); 5.KhI <[
bf.Close(); bG`aF*10)!
nCount++; 8.S&J6
} \G+ hi9T(
GlobalFreePtr(lpData); 3dlL?+Y#
if(nCount==1) KiXRBFo
m_Number.Format("%d picture captured.",nCount); g]sc)4
else _sEkKh8x
m_Number.Format("%d pictures captured.",nCount); yHY \4OHS
UpdateData(FALSE); vhA4ol
} R/&Ev$:
Vz(O=w=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8U98`#
i
{ B:-qUuS?R
if(pMsg -> message == WM_KEYDOWN) z+RA
{ R!mFMw"
if(pMsg -> wParam == VK_ESCAPE) cO]_5@#f'8
return TRUE; IQ$cLr-S
if(pMsg -> wParam == VK_RETURN) e}
=tUdDf
return TRUE; MN wMF
} sp=;i8Y 3
return CDialog::PreTranslateMessage(pMsg); >5rb4
} ;7jszs.6%
O#j&8hQ>
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rHzwSR@}1
{ /i'dhiG
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qhFWQ1W
SaveBmp(); JDTlzu1hR
return FALSE; ; L<D-=
} ~N<zv({lG
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Hs}3c
R}
CMenu pop; fC$Rz#5?
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =UGyZV:z5
CMenu*pMenu=pop.GetSubMenu(0); E}7@?o7u}
pMenu->SetDefaultItem(ID_EXITICON); q%g!TFMg
CPoint pt; :gD=F &V
GetCursorPos(&pt); p_^Jr*Mv
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M0+xl+c+
if(id==ID_EXITICON) `x{*P.]N!<
DeleteIcon(); qL;OE.?oA
else if(id==ID_EXIT) P2U^%_~
OnCancel(); ~F gxhK2+
return FALSE; %\i
OX|F_
} _,,w>q6K
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {5%u G2g
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S!'Y:AeD&
AddIcon(); 7gX#^YkE+k
return res; _#9F@SCA
} TBAF_$
,;&j*qFi
void CCaptureDlg::AddIcon() 9L2]PU
v
{ NNOemTh
NOTIFYICONDATA data; ,>YW7+kY
data.cbSize=sizeof(NOTIFYICONDATA); dF@m4U@L
CString tip; e}xx4mYo
tip.LoadString(IDS_ICONTIP); "s$$M\)T
data.hIcon=GetIcon(0); F.]D\"0`
data.hWnd=GetSafeHwnd(); aR- ?t14
strcpy(data.szTip,tip); })?t:zX#*
data.uCallbackMessage=IDM_SHELL; `#/0q*$
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F'~\!dNL
data.uID=98; bdS
Shell_NotifyIcon(NIM_ADD,&data); |n*nByL/
ShowWindow(SW_HIDE); 50<QF
bTray=TRUE; kH.e"e
} dH5 Go9`~R
i[IOR0
void CCaptureDlg::DeleteIcon() xF/u('A
{ jpGZ&L7i&
NOTIFYICONDATA data; G\X}gqe(OJ
data.cbSize=sizeof(NOTIFYICONDATA); zwLJ|>
data.hWnd=GetSafeHwnd(); C2X$ bX"
data.uID=98; [w1 4hHnq
Shell_NotifyIcon(NIM_DELETE,&data); '<Fr}Cn
ShowWindow(SW_SHOW); 4r+@7hnK
SetForegroundWindow(); |~+i=y
ShowWindow(SW_SHOWNORMAL); [}mx4i
bTray=FALSE; Lrrc&;
} H.Q648A"PF
ZH~=;S-t
void CCaptureDlg::OnChange() :637MD>5lO
{ w
\ U?64
RegisterHotkey(); 4X}.aZO&b
} fk6`DUBV
{Xjj-@
BOOL CCaptureDlg::RegisterHotkey() {^z>uRZ3
{ ~x-"?K
UpdateData(); ++gWyzD
UCHAR mask=0; >bLhCgF:"
UCHAR key=0; (XU(e
if(m_bControl) qh]D=i
mask|=4; }zO>y%eI
if(m_bAlt) rGn6S&-
mask|=2; ?LwBF;Y
if(m_bShift) Pg''>6w>
mask|=1; 1_=I\zx(
key=Key_Table[m_Key.GetCurSel()]; X_\$hF
if(bRegistered){ 'PS_|zI
DeleteHotkey(GetSafeHwnd(),cKey,cMask); O>KrTK-AV
bRegistered=FALSE; ~LfFLC
} ~WW!P_wI,
cMask=mask; BzXTHFMSy
cKey=key; .7<6
zG6J
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >d9b"T
return bRegistered; BwJL)$D<S
} O{<uW-
Fd1t/B,
四、小结 |uIgZ|7[
>7$h
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。