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:
|d=MX>i|G
@(s"5i.`) 一、实现方法
P:2 0i*QU ewv[nJD$ 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:
hFr?84sAd M;F&Ix #pragma data_seg("shareddata")
:EZ"D#>y~ HHOOK hHook =NULL; //钩子句柄
+)-`$N UINT nHookCount =0; //挂接的程序数目
i>L>3]SRr{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
VD- 2{em static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/]"2;e-s+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
O)9{qU:[b static int KeyCount =0;
VH5Vg We static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Dv[ 35[Yh #pragma data_seg()
t"]~e" %2TjG 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
U#1,]a\ 06~HVv DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
4O'X+dv^I Dl95Vo=1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\D,c*I|p7 cKey,UCHAR cMask)
d`&F {
#F!'B|n BOOL bAdded=FALSE;
tO]`
I- for(int index=0;index<MAX_KEY;index++){
Irnfr\l. if(hCallWnd[index]==0){
i-_ * 5%A hCallWnd[index]=hWnd;
_T[m YY HotKey[index]=cKey;
(
mKuFz7 HotKeyMask[index]=cMask;
7!-y72qx bAdded=TRUE;
0s8w)%4$ KeyCount++;
ZdY)&LJ break;
"Rv],O" }
-% Z?rn2 }
8m;tgMFO return bAdded;
::A]p@ }
l:H}Y3_I //删除热键
Ff@Cs0R BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
and)>$)| {
uGMmS9v$ J BOOL bRemoved=FALSE;
BV01&.<| for(int index=0;index<MAX_KEY;index++){
QL_9a,R'r if(hCallWnd[index]==hWnd){
',P E25Z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&?gvW//L2 hCallWnd[index]=NULL;
7;;HP`vY HotKey[index]=0;
{@w!kl~8 HotKeyMask[index]=0;
G@Y!*ZH*f bRemoved=TRUE;
_}(ej&'f KeyCount--;
E/_I$<,_y break;
XUp'wP }
zVU{jmS }
1y($h< }
/vLdm-4 return bRemoved;
N9A#@c0O }
2[qlEtvQ
+*aZ9g d~U}IMj DLL中的钩子函数如下:
x[5uz)) yq2pg8% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
I>( \B| \6 {
vMB`TpZ BOOL bProcessed=FALSE;
Wy`ve~y if(HC_ACTION==nCode)
:AM5EO {
BHa'`lCb if((lParam&0xc0000000)==0xc0000000){// 有键松开
-%eBip,'yl switch(wParam)
z<c%Xl\$% {
.V Cfh+*J# case VK_MENU:
^yo~C3r~ MaskBits&=~ALTBIT;
>MeM break;
n6Qsug$z case VK_CONTROL:
#[C=LGi MaskBits&=~CTRLBIT;
_rU%DL? break;
1SGLA"r case VK_SHIFT:
x<es1A'u6 MaskBits&=~SHIFTBIT;
F+3}Gkn break;
Lradyo44u\ default: //judge the key and send message
.sOEqwO}> break;
?]]d
s] }
)IH|S5mG? for(int index=0;index<MAX_KEY;index++){
`oq][| if(hCallWnd[index]==NULL)
~!& "b1
continue;
.!pr0/9B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%!X|X,b^O {
U'(@?]2<G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"$Mz>]3&q bProcessed=TRUE;
jJK`+J,i}X }
Q'B2!9=LB }
6,q}1- }
6*\WH% else if((lParam&0xc000ffff)==1){ //有键按下
5m]N%{<jAB switch(wParam)
iir]M`A.- {
<_N<L\ case VK_MENU:
,'f^K!iA MaskBits|=ALTBIT;
_sGmkJi] break;
W1T%
Q88 case VK_CONTROL:
e(~9JP9 MaskBits|=CTRLBIT;
^L@2%}6b` break;
e: aa case VK_SHIFT:
\_w>I_=F MaskBits|=SHIFTBIT;
34gC[G= break;
4Lb!Au|Y default: //judge the key and send message
~0 Ifg_G break;
hE|W%~Jx }
&Q`{ Gk for(int index=0;index<MAX_KEY;index++){
C3"5XR_Ov if(hCallWnd[index]==NULL)
j@HOU~x continue;
tvlrUp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(rfR:[JkC2 {
p?v. 42R:z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_P{f+HxU bProcessed=TRUE;
y k{8O.g }
0lm7'H*~ }
# zbAA<f }
z?DI4O#Up if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
^.HvuG},O for(int index=0;index<MAX_KEY;index++){
Ok V*,n if(hCallWnd[index]==NULL)
3Hd~mfO\ continue;
-$2a@K,i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
U7do,jCoa SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
hRwj-N%C //lParam的意义可看MSDN中WM_KEYDOWN部分
MoX~ZewWR }
-+ha4JOB }
,ut-Di=6 }
CVt:tV return CallNextHookEx( hHook, nCode, wParam, lParam );
n LD1j }
z*FCd6X cM hBOm* 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:
E;tEmGf6F y2{uEbA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!jTtMx BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[^S(SPL :2zga=)g 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:
BH"OphE h%%ryQQ&< LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
J6[V7R[\ {
{KGEv% if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
tSVWO]< {
[Xyu_I-c //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
U5RLM_a@M SaveBmp();
>_J9D?3S return FALSE;
SIridZ*% }
|8q:sr_ …… //其它处理及默认处理
!*eDT4a }
Oo0SDWI`( !7hjA=0
4'wbtE| 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。
e=^^TX`I 2Wn*J[5 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。
K'_qi8Z \]8F_K 二、编程步骤
v8} vk]b .sCj3sX* 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";
VtN1 [} \'Q rJ ?D 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
CBr(a'3{Z 3%[;nhbA7 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;
4=~+Bz n
"bii7h 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;
#PkZi(k
hv &"r /&7: 5、 添加代码,编译运行程序。
W=:AOBK ?Xl;>}zj 三、程序代码
gHo sPY[ X`6"^
xme ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
7 'q *(v #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
QdrZi.qKH #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
g7"2}|qxo #if _MSC_VER > 1000
(QTF+~) #pragma once
x:K~?c3 #endif // _MSC_VER > 1000
:N^+!,i #ifndef __AFXWIN_H__
zub"Ap3 #error include 'stdafx.h' before including this file for PCH
b}
0G~oLP #endif
rez)$ #include "resource.h" // main symbols
Vak\N)=u class CHookApp : public CWinApp
8<)ZpB,7 {
hYht8?6}m public:
{vq| 0t\- CHookApp();
u*T(n s
l // Overrides
"g,`K s ]; // ClassWizard generated virtual function overrides
xG(xG%J //{{AFX_VIRTUAL(CHookApp)
]t0St~qUL) public:
J%u,qF}h virtual BOOL InitInstance();
'Qh1$X)R7a virtual int ExitInstance();
@y'0_Y0-B //}}AFX_VIRTUAL
DL*vF>v //{{AFX_MSG(CHookApp)
#CV]S4/^ // NOTE - the ClassWizard will add and remove member functions here.
r~z'QG6v/ // DO NOT EDIT what you see in these blocks of generated code !
iInWw"VbKe //}}AFX_MSG
W cGg DECLARE_MESSAGE_MAP()
4{@{VsXN };
BsU}HuQZQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
,v<7O_A/e BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
]rG/?1'^i BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/9e?uC6 BOOL InitHotkey();
n$F~ BOOL UnInit();
Fw S>V2R #endif
uGv|!UQw {Q}F.0Q //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
L>h|1ZK #include "stdafx.h"
N;`/>R4|I #include "hook.h"
g/FZ?Wo #include <windowsx.h>
kH5D%`Kw #ifdef _DEBUG
31~nay15 #define new DEBUG_NEW
:h(`eC #undef THIS_FILE
)q66^%;S static char THIS_FILE[] = __FILE__;
35Yf,@VO #endif
nwp(% fBo #define MAX_KEY 100
gBky ZK #define CTRLBIT 0x04
.g3=L #define ALTBIT 0x02
&7i&"TNptP #define SHIFTBIT 0x01
2t4\L3 #pragma data_seg("shareddata")
Mf2F LrAh HHOOK hHook =NULL;
E.Q]X]q UINT nHookCount =0;
|AH>EXhv static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
:KgH7s} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
DXo]O}VF static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
S,j. ?u*! static int KeyCount =0;
f S[-K?K static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&s(J:P$! #pragma data_seg()
=W &Mt HINSTANCE hins;
V2!0),]B void VerifyWindow();
m):*>o55 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
/Kd7#@ //{{AFX_MSG_MAP(CHookApp)
l n\qvD_ // NOTE - the ClassWizard will add and remove mapping macros here.
b[GhI+_ // DO NOT EDIT what you see in these blocks of generated code!
m<49<O6o //}}AFX_MSG_MAP
RC/45:hZZ END_MESSAGE_MAP()
(6.uNLr ^?$,sS
;Q CHookApp::CHookApp()
_1NK9dp: {
'zM=[#!B // TODO: add construction code here,
LFI#wGhXVk // Place all significant initialization in InitInstance
l>MDCqV }
HhL;64OYa ei<0,w[V1{ CHookApp theApp;
0$]iRE;O] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R{fJ"Q5' {
jQ,Vs=*H BOOL bProcessed=FALSE;
Kxch.$hc, if(HC_ACTION==nCode)
V"Z8-u {
g@37t @I if((lParam&0xc0000000)==0xc0000000){// Key up
<|3%}? switch(wParam)
P`ou:M{8 {
.%s
U)$bH case VK_MENU:
~ney~Pz_ MaskBits&=~ALTBIT;
m`9nDiV break;
f4fBUZ^ A case VK_CONTROL:
f-G)pHm MaskBits&=~CTRLBIT;
#R{>@]x` break;
3*&
Y'/! case VK_SHIFT:
0:`|T jf_ MaskBits&=~SHIFTBIT;
.07`nIs" break;
~N/r;omVc default: //judge the key and send message
mUbm3JIjJ break;
4;I\%qes }
|DV?5>> for(int index=0;index<MAX_KEY;index++){
~W [I if(hCallWnd[index]==NULL)
~L"$(^/ continue;
!(rAI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QXZyiJX} {
`XhH{*Q"X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qx'0(q2Ii( bProcessed=TRUE;
c7jmzo }
X+C*+k,z }
a8f#q]TyQ }
%\v8FCb else if((lParam&0xc000ffff)==1){ //Key down
aknIrblS\ switch(wParam)
&yvvea] {
\4L ur case VK_MENU:
0eNdKE MaskBits|=ALTBIT;
%W"u4
NT7 break;
uMEM7$o case VK_CONTROL:
vY-CXWC7 MaskBits|=CTRLBIT;
.P$m?p# break;
]:Gy]qkO case VK_SHIFT:
)Cl>% 9 MaskBits|=SHIFTBIT;
%+H _V1F break;
3l~+VBR_ default: //judge the key and send message
BYB4-, break;
$G-<kC}8: }
KGYbPty} for(int index=0;index<MAX_KEY;index++)
?1D!%jfi {
:Ln)j%& if(hCallWnd[index]==NULL)
|gA@WV-% continue;
' @RF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>`\.i,X.D {
zak\%yY` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`*3A7y bProcessed=TRUE;
z_!IA
] v }
?
`p/jA }
o{G*7V@H }
A$=ny6 if(!bProcessed){
:$$~$P for(int index=0;index<MAX_KEY;index++){
WM'!|lg if(hCallWnd[index]==NULL)
d ItfR'$ continue;
orFwy! if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&KjMw:l SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#NW+t|E }
Jt=-> }
`qc"JB }
[UA*We 1 return CallNextHookEx( hHook, nCode, wParam, lParam );
,*J@ic7" }
s/tLY/U/ XgC^-A w BOOL InitHotkey()
f6%k;R.Wz {
Vr
EGR$ if(hHook!=NULL){
+@Qr GY nHookCount++;
gx.\H3y return TRUE;
In1W/? }
ENZym else
J'}+0mln hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
m$p}cok#+S if(hHook!=NULL)
l8FJ \5'M nHookCount++;
5vyg-' return (hHook!=NULL);
s<zN`&t }
lxyTh'
BOOL UnInit()
"V' r}> {
&DWSf`:Hx if(nHookCount>1){
LDr?'M!D nHookCount--;
e*2^ return TRUE;
'2.ey33V }
AioW*`[WjA BOOL unhooked = UnhookWindowsHookEx(hHook);
H?=W]<!W{y if(unhooked==TRUE){
:1A:g^n nHookCount=0;
W3,r@mi^s7 hHook=NULL;
Ddr.6`VJ }
gAD f9x"b return unhooked;
,{PN6B }
UjI./"]O b* n3Fej BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kG/1 {
<=NnrZOF BOOL bAdded=FALSE;
_d]{[&
p4t for(int index=0;index<MAX_KEY;index++){
.o/|]d`% if(hCallWnd[index]==0){
FOQ-KP\=, hCallWnd[index]=hWnd;
5-X$"Z|@ HotKey[index]=cKey;
}|Qh+{H*. HotKeyMask[index]=cMask;
cy8>M))c bAdded=TRUE;
8J3#(aBm KeyCount++;
"du(BZw break;
m^QoB }
^*}D*=>\ }
7Mh'x:p return bAdded;
28"1ONs3 }
j2D!=PK; v
WXo# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
th{f|fm62 {
G3_7e A#; BOOL bRemoved=FALSE;
tg\Nm7I for(int index=0;index<MAX_KEY;index++){
GrLxERf if(hCallWnd[index]==hWnd){
y~+LzDV if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
sWlxt q g hCallWnd[index]=NULL;
t{]
6GlW HotKey[index]=0;
d~aTjf HotKeyMask[index]=0;
ArtY;.cg% bRemoved=TRUE;
{'{}@CuA2 KeyCount--;
mW"e break;
}!iopu }
MLV]+H[mt }
xRWfZ3E# }
oDZZ return bRemoved;
TB>_#+: }
aH"d~Y^ BbX$R`f void VerifyWindow()
] V/5<O1 {
8XH;<z<oJ for(int i=0;i<MAX_KEY;i++){
E:9RskI if(hCallWnd
!=NULL){ 0kUhz\"R:q
if(!IsWindow(hCallWnd)){ &`m.]RV
hCallWnd=NULL; D+!T5)>(
HotKey=0; K}cZK
HotKeyMask=0; &>c=/]Lop
KeyCount--; %bP+P(vZ
} Vx!ZF+
} Q,.dIPla
} @wXYza0|d
} ":eyf3M
I;XM4a
BOOL CHookApp::InitInstance() XO;_F"H=
{ `lY-/Ty
AFX_MANAGE_STATE(AfxGetStaticModuleState()); r.?dT |A
hins=AfxGetInstanceHandle(); @{IX
do
InitHotkey(); <2(X?,N5BD
return CWinApp::InitInstance(); 4m\Cc_:jO
} @lzq`SzM
1jx?zvE,
int CHookApp::ExitInstance() OFohyy(
{ $~8gh>`]
VerifyWindow(); CZzt=9
UnInit(); \ ERBb.
return CWinApp::ExitInstance(); qg j;E=7
} Z%?>H iy'o
GNW$:=0u
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {%wrx'<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #`@)lU+/
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0Y0z7A:
#if _MSC_VER > 1000 IYe[IHny1
#pragma once &DQ_qOKD
#endif // _MSC_VER > 1000 [p4([ef
'
rv{ Wti[
class CCaptureDlg : public CDialog s {*rBX8N
{ "A[.7 w
// Construction {v!w2p@
public: =&g:dX|q8
BOOL bTray; @[D5{v)S
BOOL bRegistered; C,ldi"|
BOOL RegisterHotkey(); qi@Nz=t#HJ
UCHAR cKey; ]#N8e?b,
UCHAR cMask; ;-i)}<
void DeleteIcon(); vo#$xwm1
void AddIcon(); \ $TM=Ykj
UINT nCount; T pCXe\W
void SaveBmp(); vmxS^_I
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^E,
#}cW
// Dialog Data l )r^|9{
//{{AFX_DATA(CCaptureDlg) 0]ai*\,W7~
enum { IDD = IDD_CAPTURE_DIALOG }; sfVzVS[
CComboBox m_Key; `_&vvJPn@!
BOOL m_bControl; K
z^.v`
BOOL m_bAlt; "'+/ax[{
BOOL m_bShift; A/ zAB3
CString m_Path; M\ wCZG
CString m_Number;
rhF2U
//}}AFX_DATA Ozqh Jb
// ClassWizard generated virtual function overrides D{7sfkcJ
//{{AFX_VIRTUAL(CCaptureDlg) N/C$8D34
public: #x;d+Q@
virtual BOOL PreTranslateMessage(MSG* pMsg); ?RE"<L
protected: eLH=PDdO
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U7LCd+Z5X
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `MT.<5H
//}}AFX_VIRTUAL P{RGW.Ci@
// Implementation k(`> (w
protected: e0C_ NFS+
HICON m_hIcon; \]FPv7!
// Generated message map functions af[dkuv
//{{AFX_MSG(CCaptureDlg)
ndyIsR
virtual BOOL OnInitDialog(); ./tZ*sP:
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); JrxQ.,*i
afx_msg void OnPaint(); :MYLap&L&
afx_msg HCURSOR OnQueryDragIcon();
zW ?=^bE
virtual void OnCancel(); ~- aUw}U
afx_msg void OnAbout(); 2*W|s7cc
afx_msg void OnBrowse(); uKY1AC__
afx_msg void OnChange(); L{ej<0 yr
//}}AFX_MSG IM,d6lN6s
DECLARE_MESSAGE_MAP() >z3l@
}; nr>Yj?la
#endif 0#5&*
aEEb1Y
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8VpmcGvc3
#include "stdafx.h" sCf)#6mI
#include "Capture.h" ow+_g R-
#include "CaptureDlg.h" D3tcwjXoW_
#include <windowsx.h> Qp@}v7Due
#pragma comment(lib,"hook.lib") O*F= xG
#ifdef _DEBUG N+]HJ`K
#define new DEBUG_NEW 6 {`J I
#undef THIS_FILE [$]-W$j+
static char THIS_FILE[] = __FILE__; D7IhNWrgj
#endif }Oe4wEYN)
#define IDM_SHELL WM_USER+1 -g"Wi@Qr
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >N0L
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cI6Td*vM
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?:5/4YC
class CAboutDlg : public CDialog (s+}l?
{ tI0D{Xrc
public: @]]\r.DG
CAboutDlg(); A)#Fyde
// Dialog Data eOb)uIF
//{{AFX_DATA(CAboutDlg) P-Gp^JX8
enum { IDD = IDD_ABOUTBOX }; H ~<.2b
//}}AFX_DATA F${}n1D
// ClassWizard generated virtual function overrides 1yS:`
//{{AFX_VIRTUAL(CAboutDlg) '^Q$:P{G?
protected: *\0h^^|@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x9]vhR/av
//}}AFX_VIRTUAL L8pKVr
// Implementation ihct~y-9W
protected: ?5[$d{ Gjl
//{{AFX_MSG(CAboutDlg) !6 kn>447Y
//}}AFX_MSG 3z k},8fu
DECLARE_MESSAGE_MAP() H-%
B<7
}; WxJaE;`Ige
L 'e|D=y
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Lq#!}QcW=
{ ,{'ZP_
//{{AFX_DATA_INIT(CAboutDlg) hBDmC_\~
//}}AFX_DATA_INIT !%D;H ~mQ
} $m-@ICG#
6,l5Q
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gd0a,_`M
{ \Jwc[R&x
CDialog::DoDataExchange(pDX); Co/04F.
//{{AFX_DATA_MAP(CAboutDlg) TD/ 4lL~(x
//}}AFX_DATA_MAP [.;I}
} #8WHIDS>
2p *!up(
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8y4t9V
//{{AFX_MSG_MAP(CAboutDlg) b6""q9S!
// No message handlers tt&{f <*
//}}AFX_MSG_MAP <`BDN
END_MESSAGE_MAP() ]~pM;6Pu0
5IRUG)Icr
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DnCIfda2g
: CDialog(CCaptureDlg::IDD, pParent) w,1*dn
{ XCGK&OGI
//{{AFX_DATA_INIT(CCaptureDlg) 0Fs2* FS
m_bControl = FALSE; US<l4
m_bAlt = FALSE; r+a0.
m_bShift = FALSE; @><8YN^)%
m_Path = _T("c:\\"); 7Xh
;dJAF3
m_Number = _T("0 picture captured."); +~xzgaL
nCount=0; -^>7\]
bRegistered=FALSE; ] $F%
bTray=FALSE; uOx"oR|
//}}AFX_DATA_INIT BWkTQd<t
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z|<?=c2P
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^_=bssaOd
} )SaMfP1=v
=|V#~p*
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Om8Sgy?
{ 3[R[`l]v?
CDialog::DoDataExchange(pDX); \mFgjPz
//{{AFX_DATA_MAP(CCaptureDlg) p3IhK>
DDX_Control(pDX, IDC_KEY, m_Key); )|&FBz;
DDX_Check(pDX, IDC_CONTROL, m_bControl); Q*9Y.W. 8
DDX_Check(pDX, IDC_ALT, m_bAlt); ?{1& J9H
DDX_Check(pDX, IDC_SHIFT, m_bShift); $L72%T
DDX_Text(pDX, IDC_PATH, m_Path);
C5TC@ w1*
DDX_Text(pDX, IDC_NUMBER, m_Number); LP>GM=S#"
//}}AFX_DATA_MAP dp }zG+
} 7\i> >
&8JK^zQq
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :TP\pH 7E
//{{AFX_MSG_MAP(CCaptureDlg) 7!
/+[G
ON_WM_SYSCOMMAND() {afIr1j/m
ON_WM_PAINT() %/r:iD
ON_WM_QUERYDRAGICON() C)&BtiUN/
ON_BN_CLICKED(ID_ABOUT, OnAbout) K*tomy
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xE6hE'rh.O
ON_BN_CLICKED(ID_CHANGE, OnChange) p%+'iDb
//}}AFX_MSG_MAP <@>l9_=R
END_MESSAGE_MAP() }4q1"iMlO
N3\vd_D(
BOOL CCaptureDlg::OnInitDialog() T=[/x=
{ u y13SkW
CDialog::OnInitDialog(); }Rq{9j,%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /kqa|=-`q
ASSERT(IDM_ABOUTBOX < 0xF000); Sj<]~*y"
CMenu* pSysMenu = GetSystemMenu(FALSE); b%xG^jUXsX
if (pSysMenu != NULL) }u;`k'J@
{ &Y2Dft_K
CString strAboutMenu; "BC;zH:
strAboutMenu.LoadString(IDS_ABOUTBOX); )D7/[zb^
if (!strAboutMenu.IsEmpty()) @lCyH(c%
{ %vRCs]
pSysMenu->AppendMenu(MF_SEPARATOR); TV?MB(mN
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ey`E
E/WV
} ;y-sd?pAk
} |0VZ1{=*
SetIcon(m_hIcon, TRUE); // Set big icon {Lsl2@22
SetIcon(m_hIcon, FALSE); // Set small icon p<\7" SB=
m_Key.SetCurSel(0); ,HK-mAH
RegisterHotkey(); ]}9[ys
CMenu* pMenu=GetSystemMenu(FALSE); G^le91$
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); G54`{V4&s
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |+Tq[5&R
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Upz?x{>x
return TRUE; // return TRUE unless you set the focus to a control CTQJ=R"
} ~L"?C
=tc!"{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )<
p
~
{
^]?juL
if ((nID & 0xFFF0) == IDM_ABOUTBOX) bg^<e}{<H
{ z6 .^a-sU5
CAboutDlg dlgAbout; m-<m[ 49
dlgAbout.DoModal(); r"`7ezun:
} kTm}VTr
1
else C ~04#z_$
{ 2u(G:cR
CDialog::OnSysCommand(nID, lParam); gvFCsVv<{
} 7Q?^wx
} [-VIojs+u
@jKB[S;JSn
void CCaptureDlg::OnPaint() &W*^&0AV
{ f%rZ2h)
if (IsIconic()) wotw nE
{ sAoxLI
CPaintDC dc(this); // device context for painting YVPLHwh/5
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ">vi=Tr
// Center icon in client rectangle #GzowI'
int cxIcon = GetSystemMetrics(SM_CXICON); OU<v9`<
int cyIcon = GetSystemMetrics(SM_CYICON); dQy K4T
CRect rect; aAgQ^LY
GetClientRect(&rect); m%s:4Z%=
int x = (rect.Width() - cxIcon + 1) / 2; ~re~Ys
int y = (rect.Height() - cyIcon + 1) / 2; f'TEua_`
// Draw the icon !i\ gCLg2_
dc.DrawIcon(x, y, m_hIcon); +tJ 7ZR%
} b8glZb*$
else gKtgW&PYm
{ I5ZM U
CDialog::OnPaint(); U+&Eps&NI
} xL"O~jTS
} t$rla_rbY
k`J|]99Wb
HCURSOR CCaptureDlg::OnQueryDragIcon() \t)`Cp6,[b
{ ]AX3ov6z9;
return (HCURSOR) m_hIcon; \;JZt[
} uc/W/c u,
|mcc?*%t8
void CCaptureDlg::OnCancel() BO.Db``
{ q`UaJ_7
if(bTray) 0e1-ZP CDj
DeleteIcon(); ~EU\\;1Rmq
CDialog::OnCancel(); Gr#WD=I-}
} ;3o7>yEv
<6X*k{
void CCaptureDlg::OnAbout() e0hY
{ ^,aI2vC
CAboutDlg dlg; 'UM *7
dlg.DoModal(); "<LWz&e^^
} Zpz3?VM(
OsKtxtLO
void CCaptureDlg::OnBrowse() %*#+(A"V
{ ABcB-V4
CString str; .br6x^\<
BROWSEINFO bi; Y(R.<LtY
char name[MAX_PATH]; $=) Pky-~
ZeroMemory(&bi,sizeof(BROWSEINFO)); kT:I.,N
bi.hwndOwner=GetSafeHwnd(); nu(7YYCM$
bi.pszDisplayName=name; o=Y'ns^a(
bi.lpszTitle="Select folder"; ]J@-,FFC
bi.ulFlags=BIF_RETURNONLYFSDIRS; D"%>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); I5 qrHBJ >
if(idl==NULL) QNH3\<IS
return; c=X+uO-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); m"QDc[^Ge
str.ReleaseBuffer(); Xt
+9z
m_Path=str; ILqBa:J
if(str.GetAt(str.GetLength()-1)!='\\') ?wFL\C
m_Path+="\\"; 7VL|\^Y `q
UpdateData(FALSE); na"!"C
s3
} T"<)B^8f
7Gy:T47T\@
void CCaptureDlg::SaveBmp() Kxg@( Q
{ J_?v=dW`
CDC dc; :Qhrh(i
dc.CreateDC("DISPLAY",NULL,NULL,NULL); b'Km-'MtH
CBitmap bm; "p7nngn~
int Width=GetSystemMetrics(SM_CXSCREEN); !#=3>\np+X
int Height=GetSystemMetrics(SM_CYSCREEN); X-#&]^d
bm.CreateCompatibleBitmap(&dc,Width,Height); V1~@
CDC tdc; m xqY
tdc.CreateCompatibleDC(&dc); <'N:K@Cs
CBitmap*pOld=tdc.SelectObject(&bm); *ifz@8C }
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5{Q9n{dOh
tdc.SelectObject(pOld); p4
=/rkq
BITMAP btm; :q?#$?
bm.GetBitmap(&btm); e.~11bx
DWORD size=btm.bmWidthBytes*btm.bmHeight; K6sXw[VC[
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w)`XM
BITMAPINFOHEADER bih; 57-Hx;
bih.biBitCount=btm.bmBitsPixel; *l=(?Pe<
bih.biClrImportant=0; Eku9u
bih.biClrUsed=0; 9g>)7Ne
bih.biCompression=0; )Yv=:+f
bih.biHeight=btm.bmHeight; |0Xf":
bih.biPlanes=1; 3bYjW=_hA
bih.biSize=sizeof(BITMAPINFOHEADER); Ri~$hs!
bih.biSizeImage=size; M&/%qF15
bih.biWidth=btm.bmWidth; hzRKv6
bih.biXPelsPerMeter=0; g5lb3`a3
bih.biYPelsPerMeter=0; tRZ4\Bu
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K/K-u
static int filecount=0; I]E 3&gnC
CString name; Q$v00z]f*
name.Format("pict%04d.bmp",filecount++); -J8Hsqf@
name=m_Path+name; {/H<_
BITMAPFILEHEADER bfh; CS~_>bn
bfh.bfReserved1=bfh.bfReserved2=0; ~$J(it-a
bfh.bfType=((WORD)('M'<< 8)|'B'); ~UZ3 lN\E
bfh.bfSize=54+size; a[ayr$Hk?
bfh.bfOffBits=54; ^
nI2<P
CFile bf; "r*`*1
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QXN_ ?E,g/
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IWq#W(yM
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &N._}ts
bf.WriteHuge(lpData,size); JWI Y0iP
bf.Close(); _OyQ:>M6P
nCount++; @OkoT:
} oLh ,F"nB
GlobalFreePtr(lpData); 8-B7_GoJ+B
if(nCount==1) ;o9ixmT<-o
m_Number.Format("%d picture captured.",nCount); \~"Ub"~I
else v"W*@7<`S
m_Number.Format("%d pictures captured.",nCount); "~^0
UpdateData(FALSE); ir/uHN@
} doOuc4
<|jh3Hlp
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <r.QS[:h
{ owQ,op#
if(pMsg -> message == WM_KEYDOWN) /Pkz3(1
{ .
ump?
M
if(pMsg -> wParam == VK_ESCAPE) sQac%.H;`U
return TRUE; dC{dw^
if(pMsg -> wParam == VK_RETURN) _io'8X2K%
return TRUE; Uq$/Q7
} q]I aRho
return CDialog::PreTranslateMessage(pMsg); Dzf\m>H[
} >%om[]0E
.Zv~a&GE
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {;u,04OVK
{ UZ2_FP
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ YLGE{bS
SaveBmp(); kuD$]A
Q`&
return FALSE; bo/9k 4N3
} X<$Tn60,
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @,TIw[p
CMenu pop; lz~^*\ F
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8c+V$rH_
CMenu*pMenu=pop.GetSubMenu(0); C| ~A]wc=
pMenu->SetDefaultItem(ID_EXITICON); 2cH RiRT
CPoint pt; rB$~,q&.V
GetCursorPos(&pt); rZJJ\ , |
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); e,/]]E/o
if(id==ID_EXITICON) ZK+F<}
DeleteIcon(); _&BK4?H@b
else if(id==ID_EXIT) "TZY)\{L
OnCancel(); {pIh/0
return FALSE; $t.oGd@N
} G?'^"ae"Z
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gVfFEF.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,3Q~X$f
AddIcon(); w;`Jj-
return res; 6dR+qJa6i
} >5Yn`Fc5
$t):r@L
void CCaptureDlg::AddIcon() t4_yp_
{ ?J2A1iuq3
NOTIFYICONDATA data; kt2_WW[
data.cbSize=sizeof(NOTIFYICONDATA); =JIceLL
CString tip; z7bJV/f
tip.LoadString(IDS_ICONTIP); eTvWkpK+
data.hIcon=GetIcon(0); ;+E]F8G9r
data.hWnd=GetSafeHwnd(); '7sf)0\:<p
strcpy(data.szTip,tip); PJC(:R(j
data.uCallbackMessage=IDM_SHELL; <-`.u`
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x?{UWh%
data.uID=98; pqb'L]
Shell_NotifyIcon(NIM_ADD,&data); Op ar+|p\
ShowWindow(SW_HIDE); k77 3h`;
bTray=TRUE; KD &nLm!
} 7qB4_
1"ZtE\{
"
void CCaptureDlg::DeleteIcon() +9b{Y^^~T
{ LBCH7@V1yR
NOTIFYICONDATA data; >nghFm
data.cbSize=sizeof(NOTIFYICONDATA); S@HC$
data.hWnd=GetSafeHwnd(); uI7n{4W*x
data.uID=98; w~b:9_reY
Shell_NotifyIcon(NIM_DELETE,&data); v"o"W[
ShowWindow(SW_SHOW); \mc0fY
SetForegroundWindow(); >0{}tRm-P&
ShowWindow(SW_SHOWNORMAL); F tIcA"^N
bTray=FALSE; LUMbRrD-
} f[k#Znr
iH }-
void CCaptureDlg::OnChange() Xkhd"Axi
{ Bdt6 w(`^
RegisterHotkey(); &L+uu',M0c
} \Mg_Q$
1n8[fgz
BOOL CCaptureDlg::RegisterHotkey() e.n(NW
{ "=Br&FN{|
UpdateData(); 1 P!)4W
UCHAR mask=0;
[P`e@$
UCHAR key=0; mZR3Hl$
if(m_bControl) #{q.s[g*+1
mask|=4; d2`g,~d
if(m_bAlt) P"_/P8
mask|=2; RhE~-b[X
if(m_bShift) Ik0g(-d
mask|=1; (?|M'gZ
key=Key_Table[m_Key.GetCurSel()]; p"ytt|H
if(bRegistered){ p0@^1
DeleteHotkey(GetSafeHwnd(),cKey,cMask); GEWjQ;g
bRegistered=FALSE; ^z{szy?Fg
} z$%twBg}#
cMask=mask; eIkKsgr>
cKey=key; Food<(!.>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y~I<L ocv
return bRegistered; D!rPF)K
)
} 7&ED>Bk
}mj9$=B4
四、小结 '>"{yi-
XDemdMy$
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。